How to Choose a Broadcast Remote ID Module

Holybro Remote ID module for preflight broadcast check

How to Choose a Broadcast Remote ID Module

Choose a broadcast Remote ID module by its FAA Declaration of Compliance status first. Only a module on the accepted DOC list meets the rule for a retrofit. Check the weight, the power source, and the mount before you buy. The Holybro module costs $49.99 but has no verified DOC entry as an end-user broadcast module.

Quick facts

Fact	Value
First check	FAA DOC list entry for the exact module
Broadcast module flight	Visual line of sight only, per the FAA
Standard Remote ID flight	No VLOS limit from Remote ID
Holybro module	$49.99, needs a flight controller feed
Holybro module weight	27.5g, per the manual
Built-in example	DJI Mini 4 Pro ships with built-in Remote ID

What is a broadcast Remote ID module?

A broadcast module is a small radio that attaches to a drone and broadcasts its ID and position. It retrofits drones with no built-in Remote ID.

It broadcasts the drone serial number, position, altitude, velocity, and takeoff location. It does not broadcast the pilot position.

A drone flying with a broadcast module must stay within visual line of sight at all times, per the FAA rule.

What is built-in Standard Remote ID?

Standard Remote ID is built into the drone by its maker. It broadcasts the drone and control station positions from takeoff to shutdown.

The maker files a Declaration of Compliance for the whole drone. The FAA DOC list shows which drones ship with Standard Remote ID.

DJI Mini 4 Pro ships with built-in Standard Remote ID, per the FAA DOC list. Check the list for your exact model and serial range.

How do you check a module on the DOC list?

Open the FAA UAS Declaration of Compliance list and search by the maker name. Filter by Remote ID to see modules and drones.

Match the exact model name and FCC ID on the list. A close name is not a match, so read the entry before you buy.

Check the serial range in the entry too. Some DOCs cover only part of a production run.

What should you check besides the DOC status?

Check the weight and the power source. A module that needs a flight controller feed suits PX4 and ArduPilot builds only.

Check the mount and the antenna. The module must sit clear of carbon and metal to broadcast well.

Check the broadcast method. Most modules use WiFi or Bluetooth, and a receiver app must see the signal.

When does the Holybro module fit?

The Holybro module fits a PX4 or ArduPilot build where the flight controller feeds it position data. It costs $49.99 and weighs 27.5g.

It is a Standard Remote ID solution for manufacturers and integrators. It needs a DoC submission of its own in the USA.

It does not fit a plug-and-play retrofit need. No DOC entry for it as an end-user broadcast module could be verified, so pick a listed module for that job.

How the options compare

Option	DOC path	Flight limit	Needs	Example
Broadcast module	Module DOC entry	Visual line of sight	Mount and power	FAA-listed module
Built-in Standard RID	Drone DOC entry	No VLOS limit from RID	Nothing to add	DJI Mini 4 Pro
Holybro module	Own DoC submission	Per the build DOC	PX4 or ArduPilot feed	Holybro Remote ID
FRIA	No module needed	Inside the FRIA only	FRIA site access	Club field

How do you choose a broadcast Remote ID module?

Check if your drone already has built-in Standard Remote ID.
Search the FAA DOC list for an accepted broadcast module.
Check the module weight and power source.
Check the mount and antenna clearance on your drone.
Enter the module serial in DroneZone after you buy it.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

Holybro Remote ID Module With Case – WiFi / Bluetooth, CAN / Serial, PX4 / ArduPilot ($49.99)

Remote ID module at $49.99. It broadcasts over WiFi and Bluetooth and runs ArduRemoteID firmware.

MAVLink2 WiFi Telemetry Module for Pixhawk/APM ($42.99)

Telemetry module at $42.99. It gives a MAVLink2 WiFi link for Pixhawk and APM flight controllers.

Matek F405-WING V2 Flight Controller with OSD and SD Slot for ArduPilot / INAV ($138.99)

Flight controller at $138.99. It runs ArduPilot with OSD and an SD slot for fixed-wing builds.

Shop the full range: GPS, Telemetry and Sensors at Quality RC Parts. See also: Related guide.

Frequently asked questions

Does a broadcast module need a GPS?

Most self-contained modules have one. The Holybro module has none and takes position data from the flight controller.

Can I fly beyond visual line of sight with a module?

No. A drone flying with a broadcast module must stay within visual line of sight at all times.

Is the Holybro module on the FAA DOC list?

No entry for it as an end-user broadcast module could be verified. It is a Standard Remote ID solution that needs its own DoC submission.

What is the difference between Standard and broadcast Remote ID?

Standard Remote ID is built in by the maker and broadcasts the pilot position too. A broadcast module adds only the drone position and takeoff point.

Sources

Last updated: November 10, 2026.

How to Register a Drone and Remote ID in DroneZone

Register a drone in FAA DroneZone, then add its Remote ID serial number to the same record. Recreational pilots register the pilot, while Part 107 pilots register each drone. Answer the Remote ID question with yes and enter the serial number from your Standard Remote ID drone or FAA-accepted broadcast module. Check the FAA Declaration of Compliance list first.

Quick facts

Fact	Value
DroneZone site	FAA DroneZone, faadronezone.faa.gov
Recreation registration	Register the pilot, $5 for 3 years
Part 107 registration	Register each drone, $5 per drone for 3 years
Remote ID serial	From a Standard Remote ID drone or listed module
DOC check	FAA UAS Declaration of Compliance list
Holybro module note	No DOC entry verified as an end-user module

Do you register the pilot or the drone?

Recreational pilots register themselves, not each drone. One registration covers all recreational drones for 3 years.

Part 107 pilots register each drone by its serial number. Each registration lasts 3 years and costs $5 per drone.

Check the FAA DroneZone pages for the current fee and term. Fees and terms can change, so read the site before you pay.

Where do you enter the Remote ID serial number?

Answer the Remote ID question with yes, then pick the device type from the list. Enter the serial number from the drone or the module.

A broadcast module serial can move between drones. List the module on each drone record that uses it.

Which serial number counts for Remote ID?

Use the serial number from a Standard Remote ID drone or an FAA-accepted broadcast module. The serial must sit on an accepted DOC.

Check the FAA Declaration of Compliance list for your exact make and model. Search by the manufacturer name when the model name differs.

Do not enter a serial from a module with no DOC entry. The Holybro module has no verified DOC entry as an end-user broadcast module.

What if your drone has no Remote ID?

Register the drone and fly it only inside a FRIA. A FRIA is an FAA-recognized area where drones without Remote ID may fly.

Fit an FAA-accepted broadcast module when you want to fly outside a FRIA. The module serial goes on the drone record.

A sub-250g drone flown only for recreation needs no registration and no Remote ID. Check the FAA page for the exact thresholds.

How do you check the registration worked?

Open the drone record in DroneZone after you save it. The Remote ID answer should read yes with the serial shown.

Print or save the registration card. Carry it when you fly, since the FAA asks for proof of registration.

Test the broadcast before flight with a receiver app or your ground station. A record without a live broadcast does not meet the rule.

How the options compare

Pilot type	What to register	Fee	Term	Remote ID
Recreation	The pilot	$5	3 years	Serial per drone
Part 107	Each drone	$5 per drone	3 years	Serial per drone

How do you register a drone and Remote ID in DroneZone?

Log in to FAA DroneZone and pick the pilot dashboard.
Register the pilot for recreation or each drone for Part 107.
Check the FAA DOC list for your drone or module.
Answer the Remote ID question with yes.
Enter the serial number and save the record.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

Holybro Remote ID Module With Case – WiFi / Bluetooth, CAN / Serial, PX4 / ArduPilot ($49.99)

Remote ID module at $49.99. It broadcasts over WiFi and Bluetooth and runs ArduRemoteID firmware.

MAVLink2 WiFi Telemetry Module for Pixhawk/APM ($42.99)

Telemetry module at $42.99. It gives a MAVLink2 WiFi link for Pixhawk and APM flight controllers.

Shop the full range: GPS, Telemetry and Sensors at Quality RC Parts. See also: Related guide.

Frequently asked questions

How much does FAA registration cost?

It costs $5. Recreational pilots pay $5 for 3 years, and Part 107 pilots pay $5 per drone for 3 years.

Can I use one broadcast module on two drones?

Yes. List the module serial on each drone record that uses it, and fly only one drone at a time with it.

What if my module is not on the DOC list?

Do not enter its serial. Use a listed module or fly inside a FRIA instead.

Do I need to register a sub-250g drone?

No, for recreation only. Part 107 flight needs registration at any weight.

Sources

Last updated: November 10, 2026.

How to Choose a Holybro Remote ID Module for PX4 Builds

Pick the Holybro Remote ID module when your flight controller runs PX4 or ArduPilot and has a free CAN or serial port. The module broadcasts over WiFi and Bluetooth and runs ArduRemoteID firmware. It is a Standard Remote ID solution for manufacturers and integrators. USA users must do their own FAA Declaration of Compliance submission. The module costs $49.99.

Quick facts

Fact	Value
Radio module	ESP-C3, WiFi and Bluetooth 2.4GHz, +20dBm
Module size	38 by 26.5 by 11.5mm, per the manual
Module weight	27.5g, per the manual
Ports	JST GH 4-pin CAN and 6-pin TELEM serial
Power	5V from the TELEM or CAN port
Module price	$49.99 with case

What does the Holybro Remote ID module do?

The module broadcasts your drone ID, position, altitude, and velocity in flight over WiFi and Bluetooth. It uses the Open Drone ID framework in ArduRemoteID firmware.

It takes position data from the flight controller over CAN or serial. It has no GPS of its own, so the flight controller must feed it a fix.

The radio is FCC and CE certified as a radio module. That certification covers the radio, not FAA Remote ID compliance.

Which flight controllers work with it?

The module works with PX4 and ArduPilot flight controllers. ArduPilot supports Remote ID from version 4.3, and PX4 from version 1.14.

Holybro lists the Pixhawk 6C as a compatible controller. Any PX4 or ArduPilot board with a free CAN or TELEM port can host it.

Check your firmware version before you order. An old ArduPilot build without Remote ID support will not feed the module.

How do you wire it to the flight controller?

Wire the 4-pin CAN port to a DroneCAN port, or wire the 6-pin TELEM port to a serial port. The module takes 5V from either port.

Set the flight controller port for Remote ID traffic. ArduPilot documents the CAN and serial setup in its Remote ID guide.

Keep the antenna clear of carbon and metal. A blocked antenna cuts the broadcast range, which the manual lists above 500m.

Is this module FAA approved for end users?

No, not as a plug-and-play broadcast module. Holybro states it is a Standard Remote ID solution for manufacturers and integrators.

Holybro states USA users must do their own FAA Declaration of Compliance submission. The QRC listing states the same warning.

No FAA Declaration of Compliance entry for this module as an end-user broadcast module could be verified. Check the FAA DOC list before you fly with it.

When should you pick a different module?

Pick an FAA-accepted broadcast module when you need a plug-and-play retrofit for an older drone. Check the FAA DOC list for accepted modules.

Pick the Holybro module when you build a Standard Remote ID aircraft as a manufacturer or integrator with a DoC plan.

Pick a FRIA flight area when your drone has no Remote ID and you fly for recreation. A FRIA needs no module at all.

How the options compare

Remote ID option	Who it fits	FAA path	Needs
Holybro module	PX4 and ArduPilot builders	Own DoC submission	CAN or serial port
FAA-accepted broadcast module	Older drone owners	DOC listed, enter serial	Mount and power
Built-in Standard Remote ID	New drone buyers	DOC listed by maker	Nothing to add
FRIA flight	Recreation pilots	Fly inside a FRIA	FRIA site access

How do you fit the Holybro Remote ID module?

Check your flight controller runs PX4 or ArduPilot with Remote ID support.
Pick the CAN port or the TELEM serial port for the module.
Wire the module and power it from 5V on that port.
Set the flight controller port for Remote ID traffic.
Check the FAA Declaration of Compliance list before you fly.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

Holybro Remote ID Module With Case – WiFi / Bluetooth, CAN / Serial, PX4 / ArduPilot ($49.99)

Remote ID module at $49.99. It broadcasts over WiFi and Bluetooth and runs ArduRemoteID firmware.

MAVLink2 WiFi Telemetry Module for Pixhawk/APM ($42.99)

Telemetry module at $42.99. It gives a MAVLink2 WiFi link for Pixhawk and APM flight controllers.

Matek F405-WING V2 Flight Controller with OSD and SD Slot for ArduPilot / INAV ($138.99)

Flight controller at $138.99. It runs ArduPilot with OSD and an SD slot for fixed-wing builds.

Shop the full range: GPS, Telemetry and Sensors at Quality RC Parts. See also: Related guide.

Frequently asked questions

Does the Holybro module have GPS?

No. It takes position data from the flight controller over CAN or serial, so the flight controller must feed it a fix.

Is the Holybro module FAA certified?

No, not as an end-user broadcast module. It is a Standard Remote ID solution, and USA users must do their own DoC submission.

What firmware does it run?

It runs ArduRemoteID firmware, which is open source. It supports firmware updates over its web interface.

How far does it broadcast?

The manual lists above 500m detection range as an estimate, with a ground test of 180m. Range depends on the antenna and the site.

Sources

Last updated: November 10, 2026.

Best XT60 Connectors for a 6S LiPo Pack

XT60H male and female connector set, 10 pairs, 60 amp

Best XT60 Connectors for a 6S LiPo Pack

An XT60H connector set suits a 6S LiPo pack, since the XT60 handles 60A and a 6S pack reads 22.2V nominal. The 10-pair XT60H set costs $11.87 and uses gold-plated copper contacts with sheath housings. Add a 14AWG extension cable at $6.31 when the battery sits far from the ESC. Six connector options follow.

Quick facts

Fact	Value
6S nominal voltage	22.2V
6S full charge	25.2V
XT60 rating	60A max
Extension cable	14AWG, rated 30A
QS8 step-up	110A continuous, 180A peak
Lowest price option here	$5.25 (splitter adapter)

What current does a 6S LiPo pack deliver?

A 6S pack reads 22.2V nominal and 25.2V at full charge. Current depends on the load, so size the connector for the peak draw of the ESC.

An XT60 connector handles 60A max with gold-plated copper contacts. That rating covers most 6S sport builds on 14AWG wire.

Measure the peak current of your ESC before you pick a connector. A 100A ESC on 6S needs a connector rated above 60A.

Which XT60 connector suits the battery lead?

Fit the XT60H set on the battery lead for a locking sheath housing. The 10-pair set costs $11.87 and handles 60A per connector.

Use a male connector on the battery and a female connector on the ESC, or match the set you already own. The XT60H set ships with both halves.

Solder the connector with the housings slid on first, since the sheath cannot fit over a soldered joint. A 60A joint needs a hot iron, so heat the cup and feed solder into it.

Do you need an extension, splitter, or switch harness?

Add a 14AWG XT60 extension cable at $6.31 when the battery sits far from the ESC. The pigtail is rated 30A, so it suits loads under that figure.

Add the XT60 splitter adapter at $5.25 to run two batteries in parallel or split power to two loads. It gives 1 male to 2 female connectors.

Add the heavy-duty XT60 switch harness at $11.99 to power the model on and off without unplugging. It uses 14AWG wire with XT60 female on one end and male on the other.

When does a 6S build need QS8 instead of XT60?

Step up to QS8 when the ESC draws more than 60A continuous. The QS8 anti-spark plug is rated 110A continuous and 180A peak.

The QS8 costs $11.99 for a male, female, or pair, so the step up costs the same as a switch harness. Its gold-plated brass contacts handle the higher current.

Keep XT60 on builds under 60A, since the smaller plug fits tight battery bays. Move to QS8 only when the current rating demands it.

How do you solder an XT60 connector?

Strip a short length of insulation and tin the wire before you solder the cup. A tinned wire seats faster and needs less heat on the joint.

Use an 80W iron for 14AWG wire, since a small iron cannot heat the cup fast enough. The 80W kit adjusts from 180C to 500C.

Let the joint cool without moving it, then tug the wire to check the bond. A cold joint looks dull and breaks under a light pull.

How do you wire two 6S packs in parallel?

Wire two 6S packs in parallel to double capacity while voltage stays at 22.2V. Parallel packs must share the same cell count and charge state.

Use the XT60 parallel Y-splitter cable at $8.49 with 14AWG silicone wire. It wires two batteries in parallel for double capacity.

Charge both packs to the same voltage before you join them. A voltage gap between packs drives current through the splitter without a load.

How the options compare

Connector	Rating	Wire	Use	Price
XT60H set, 10-pair	60A max	Not listed	Battery lead	$11.87
XT60 extension cable	30A	14AWG	Longer reach	$6.31
XT60 parallel Y-splitter	Not listed	14AWG	Two packs in parallel	$8.49
XT60 splitter adapter	Not listed	Not listed	Split power to two loads	$5.25
XT60 switch harness	Not listed	14AWG	Power on and off	$11.99
QS8 anti-spark	110A continuous, 180A peak	Not listed	Over 60A builds	$11.99

How do you fit an XT60 connector on a 6S lead?

Slide the sheath housing onto the wire before you solder anything.
Strip a short length of insulation and tin the wire end.
Heat the connector cup with an 80W iron and fill it with solder.
Push the tinned wire into the cup and hold it still until it cools.
Slide the housing over the joint and tug the wire to check the bond.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

XT60H Male + Female Connector Set with Sheath Housing, 10-Pair ($11.87)

XT60H connector set at $11.87 for 10 pairs. Gold-plated copper contacts, 60A max, with sheath housings.

XT60 Extension Cable, 14AWG ($6.31)

XT60 extension cable at $6.31. It uses 14AWG silicone wire and is rated 30A.

XT60 Parallel Y-Splitter Cable, 14AWG ($8.49)

XT60 parallel Y-splitter cable at $8.49. It uses 14AWG silicone wire and doubles capacity in parallel.

XT60 Splitter Adapter, 1 Male to 2 Female ($5.25)

XT60 splitter adapter at $5.25. It gives 1 male to 2 female connectors for parallel packs or split loads.

Heavy-Duty XT60 Switch Harness ($11.99)

Heavy-duty XT60 switch harness at $11.99. It uses 14AWG wire and powers the model on and off without unplugging.

QS8 Anti-Spark 110A Battery Connector ($11.99)

QS8 anti-spark connector at $11.99. It is rated 110A continuous and 180A peak for builds over 60A.

Shop the full range: Connectors and Wiring at Quality RC Parts. See also: Related guide.

Frequently asked questions

Can an XT60 handle a 6S LiPo pack?

Yes, up to 60A. A 6S pack reads 22.2V nominal, and the XT60 rating is a current limit, not a voltage limit.

What wire gauge suits a 6S XT60 lead?

Use 14AWG silicone wire for most 6S builds. The extension cable and Y-splitter here both use 14AWG wire.

Is the XT60 extension cable rated 60A?

No. The pigtail is rated 30A, so it suits loads under 30A. Use the XT60H set for loads up to 60A.

When should I use QS8 instead of XT60?

Use QS8 when continuous current passes 60A. The QS8 is rated 110A continuous and 180A peak.

Sources

Last updated: November 10, 2026.

Best ESP32 Board for a Robot Car

ESP32 DevKit V1 30-pin WROOM-32 development board

Best ESP32 Board for a Robot Car

An ESP32 DevKit V1 board is the right start for a robot car. It costs $11.99, runs a dual-core processor, and gives 30 pins for motors and sensors. Add an ESP32-S3-CAM board at $11.97 when the car needs a camera, since it carries 16MB of flash and 8MB of PSRAM. Six boards follow.

Quick facts

Fact	Value
Pick for most robot cars	ESP32 DevKit V1, $11.99
DevKit pins	30 pins, WROOM-32
S3-CAM memory	16MB flash, 8MB PSRAM
ESP32-CAM camera	OV2640, 4MB PSRAM
Lowest price board here	$9.99 (SuperMini)
WiFi band	2.4 GHz

Which ESP32 board suits a first robot car?

Start with the ESP32 DevKit V1 board for a first robot car. It costs $11.99, gives 30 pins, and runs WiFi and Bluetooth on 2.4 GHz.

The DevKit V1 uses a dual-core processor, so one core can read sensors while the other drives motors. Its 30-pin layout fits a breadboard or a small chassis plate.

Pick the SuperMini when space is tight, since it costs $9.99 and fits a small chassis. It comes in C3, C6, S3, and H2 versions with matching expansion boards.

Do you need a camera board or a plain board?

Add a camera board only when the car must see its path. The ESP32-S3-CAM costs $11.97 and carries an OV2640 2MP or OV5640 5MP camera.

The ESP32-CAM costs $25.99 and carries an OV2640 camera with 4MB of PSRAM. It suits video streaming over WiFi from the car.

A plain board costs less and leaves more pins free for motors and sensors. The DevKit V1 gives 30 pins with no camera attached.

How many pins does a robot car need?

A two-motor robot car needs at least 4 pins for the motor driver, plus 2 pins per line sensor. The DevKit V1 gives 30 pins, so it covers motors, sensors, and a display.

The ESP32-S2 Mini gives fewer pins than the DevKit V1 but still covers a small car. It carries 4MB of flash and 2MB of PSRAM with USB-C.

Count pins before you order, since a camera board uses pins for the camera. The S3-CAM keeps dual USB-C ports and a TF card slot for storage.

How does 3.3V logic affect your sensors and driver?

ESP32 boards use 3.3V logic, while many motor drivers and sensors expect 5V signals. Check each part for 3.3V input before you wire it.

The NodeMCU ESP8266 board runs at 3.3V too and adds a built-in 0.96 inch OLED display. It costs $11.37 and works with the Arduino IDE.

A logic level shifter bridges 3.3V and 5V parts when a sensor needs 5V. Test the shifter on the bench before you mount it in the car.

How do you power an ESP32 robot car?

Power the board from a 5V USB source or a regulator fed by the drive battery. The DevKit V1 takes Micro USB or Type-C input, so a USB battery pack works on the bench.

A TP4056 charging module charges a single lithium cell at 1A from a 5V USB source. Never charge a lithium cell without a proper charging module.

Keep motor wires away from sensor wires to cut electrical noise. A separate battery for motors and logic also cuts noise on a first build.

What code runs an ESP32 robot car?

The Arduino IDE compiles sketches for ESP32 boards through the Arduino-ESP32 core. Espressif documents the core with install steps and pin maps.

An ESP32 runs at up to 240 MHz, so it handles WiFi and motor control in one loop. The DevKit V1 runs the same core as the other boards here.

Start with a loop that reads two line sensors and sets motor speeds. Add the camera stream later, once the car drives straight.

How the options compare

Board	WiFi	Memory	Pins or display	Price
DevKit V1	2.4 GHz WiFi + Bluetooth	Not listed	30 pins	$11.99
SuperMini	WiFi + Bluetooth	Not listed	Compact	$9.99
ESP32-S3-CAM	WiFi + Bluetooth	16MB flash, 8MB PSRAM	OV2640 2MP or OV5640 5MP	$11.97
ESP32-CAM	WiFi + Bluetooth	4MB PSRAM	OV2640 camera	$25.99
ESP32-S2 Mini	WiFi	4MB flash, 2MB PSRAM	USB-C	$11.16
NodeMCU ESP8266	WiFi	Not listed	0.96 inch OLED	$11.37

How do you wire an ESP32 robot car?

Mount the board on the chassis with standoffs, clear of moving wheels.
Connect the motor driver inputs to 4 board pins for direction and speed.
Connect the line sensors to 2 analog or digital pins each.
Power the board from 5V USB, then power the motors from the drive battery.
Upload a test sketch that spins each motor forward and back.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

ESP32 DevKit V1 Development Board, 30-Pin WROOM-32, WiFi + Bluetooth ($11.99)

DevKit V1 board at $11.99. It gives 30 pins, a dual-core processor, and WiFi plus Bluetooth.

ESP32 SuperMini Development Board, C3 / C6 / S3 / H2 + Expansion Boards, WiFi + Bluetooth ($9.99)

Compact SuperMini board at $9.99. It comes in C3, C6, S3, and H2 versions with WiFi and Bluetooth.

ESP32-S3-CAM Development Board N16R8 – Board, OV2640 or OV5640 Camera, 1/5/10-Pack ($11.97)

S3-CAM board at $11.97. It carries 16MB of flash, 8MB of PSRAM, and an OV2640 2MP or OV5640 5MP camera.

ESP32-CAM Development Board with OV2640 Camera Module, 4MB PSRAM ($25.99)

ESP32-CAM board at $25.99. It carries an OV2640 camera module with 4MB of PSRAM.

ESP32-S2 Mini Development Board, WiFi, 4MB Flash, 2MB PSRAM, USB-C ($11.16)

S2 Mini board at $11.16. It carries 4MB of flash, 2MB of PSRAM, and WiFi over USB-C.

NodeMCU ESP8266 Development Board with 0.96″ OLED Display, ESP-12E, Micro USB ($11.37)

NodeMCU ESP8266 board at $11.37. It adds a built-in 0.96 inch OLED display and works with the Arduino IDE.

TP4056 5V Micro USB 1A Lithium Battery Charging Module (5 Pack) ($6.99)

TP4056 charging modules at $6.99 for a 5-pack. Each charges a single lithium cell at 1A from 5V USB.

Shop the full range: ESP32 and ESP8266 at Quality RC Parts. See also: Related guide.

Frequently asked questions

Can an ESP32 replace an Arduino Nano in a robot car?

Yes. The ESP32 adds WiFi on 2.4 GHz and Bluetooth, and it runs at up to 240 MHz. It uses 3.3V logic, so check that your sensors and driver accept 3.3V signals.

Which ESP32 board is smallest for a robot car?

The SuperMini costs $9.99 and fits a small chassis. It comes in C3, C6, S3, and H2 versions with matching expansion boards.

Does the ESP32-CAM need a separate programmer?

No. The ESP32-CAM board here uses micro USB, and the S3-CAM uses dual USB-C ports. Both work with the Arduino IDE.

How much flash does a robot car sketch need?

A small car sketch fits in 4MB of flash. The S3-CAM gives 16MB of flash and 8MB of PSRAM for camera code.

Sources

Last updated: November 10, 2026.

Best Micro Servos for a 40-Inch RC Plane

TowerPro MG90D digital metal gear micro servo, 13 grams

Best Micro Servos for a 40-Inch RC Plane

A 9 gram micro servo with metal gears suits most control surfaces on a 40-inch RC plane. The TowerPro SG92R costs $8.00 and gives 2.5 kg/cm of torque at 4.8V, which covers ailerons and elevator on a foam airframe. Pick the DSM-44 digital servo at $22.00 for crisper centering at 0.07 seconds per 60 degrees. Six servos follow.

Quick facts

Fact	Value
Plane size	40-inch wingspan sport plane
Servo weight class	9 g micro servos
SG92R torque	2.5 kg/cm at 4.8V
SG92R speed	0.1 sec per 60 degrees at 4.8V
DSM-44 speed	0.07 sec per 60 degrees
Lowest price servo here	$8.00 for the SG92R and MA-90

What torque does a 40-inch plane need?

A 40-inch foam plane needs about 2.5 kg/cm of torque on ailerons and elevator. The SG92R gives exactly 2.5 kg/cm at 4.8V, so it covers both surfaces on a light airframe.

A rudder servo can use less torque than an aileron servo. The SG50 gives 0.6 kg/cm and weighs 5g, so it suits a small rudder or a throttle linkage.

Measure torque at 4.8V, since most receiver packs run near that voltage. A servo rated only at 6V gives less torque on a 4.8V pack.

Which micro servo fits each control surface?

Fit the SG92R on ailerons and elevator for 2.5 kg/cm of torque at $8.00. Its plastic composite gears keep the price low on a light foam plane.

Fit the MG90D on any surface that takes landing shocks, since its metal gears resist stripping. It weighs 13g and uses a digital circuit for tighter centering.

Fit the DSM-44 on ailerons when you want the fastest response in this guide. It moves in 0.07 sec per 60 degrees and gives 1.6 kg/cm of torque.

Should you pick metal gears or plastic gears?

Metal gears handle shock loads and last longer on ailerons and elevator. The MA-90 uses metal gears, gives 1.3 kg/cm, and costs $8.00.

Plastic composite gears run quieter and cost less in light foam models. The SG92R uses plastic composite gears and still gives 2.5 kg/cm at 4.8V.

Pick metal gears when the servo drives a large surface or takes hard landings. Pick plastic gears for a light park flyer with small loads.

Analog or digital: which servo type holds center?

A digital servo updates faster and holds position with more force than an analog servo. The DSM-44 is digital, moves in 0.07 sec, and gives 1.6 kg/cm.

An analog servo updates its position about 50 times per second. That rate suits trainers and slow scale models with small control loads.

The MG90D is digital and weighs 13g, so it suits ailerons on a fast sport plane. The SG92R is analog and costs $8.00, so it suits a trainer.

How do you size a micro servo for the bay?

Measure the servo bay before you order any servo. The MA-90 measures 24 by 12.2 by 30 mm, while the SA-44 measures 20 by 26 by 8.0 mm.

Match the spline count to your servo arms before you buy. Most servos in this guide use a 25 tooth spline, so check the arm listing first.

Match the voltage too. Most micro servos run on 4.8V to 6V, so a 2 cell receiver pack needs a regulator or a high voltage servo.

How do you test a servo before you install it?

Center the servo with a tester before you fit the arm. A tester checks travel and centering on the bench before the servo goes in the plane.

Power the servo from a 4.8V to 6V source, never from a bare USB port. A servo can draw 1400mA at stall, per the MG996R datasheet.

Move the arm through its full travel and listen for binding. A servo that buzzes at the end point needs its travel reduced.

How the options compare

Servo	Torque	Speed	Gears	Price
SG92R	2.5 kg/cm at 4.8V	0.1 sec per 60 deg at 4.8V	Plastic composite	$8.00
MA-90	1.3 kg/cm	0.10 sec per 60 deg at 4.8V	Metal	$8.00
SG50	0.6 kg/cm	0.1 sec	Not listed	$9.00
SA-44	0.8 kg/cm	0.12 sec	Metal	$10.00
MG90D	Not listed	Not listed	Metal, digital	$14.00
DSM-44	1.6 kg/cm	0.07 sec	Metal, digital	$22.00

How do you install a micro servo in a 40-inch plane?

Center the servo with a tester, then fit the arm at 90 degrees.
Mount the servo with its screws and rubber grommets.
Connect the servo lead to the correct receiver channel.
Power the receiver and check full travel in both directions.
Set the end points so the arm never binds at full throw.

Parts that fit this guide

In-stock parts ship from the New York, USA warehouse in 1-2 business days. Prices below are the live store prices we verified on November 10, 2026.

SG92R Analog Plastic Composite Gear Micro Servo ($8.00)

Micro servo at $8.00. It gives 2.5 kg/cm of torque at 4.8V with plastic composite gears.

MA-90 Metal Gear Micro Servo ($8.00)

Metal gear micro servo at $8.00. It gives 1.3 kg/cm of torque and moves in 0.10 sec per 60 degrees at 4.8V.

SG50 5g Micro Servo ($9.00)

Light 5g micro servo at $9.00. It gives 0.6 kg/cm of torque and moves in 0.1 sec.

SA-44 4.4g Metal Gear Sub-Micro Servo ($10.00)

Sub-micro metal gear servo at $10.00. It weighs 4.4g, gives 0.8 kg/cm, and moves in 0.12 sec.

MG90D Digital Metal Gear Micro Servo ($14.00)

Digital metal gear micro servo at $14.00. It weighs 13g and suits surfaces that take landing shocks.

DSM-44 Digital Metal Gear Micro Servo ($22.00)

Digital metal gear micro servo at $22.00. It gives 1.6 kg/cm and moves in 0.07 sec.

Shop the full range: Servos at Quality RC Parts. See also: Related guide.

Frequently asked questions

What size servo does a 40-inch RC plane need?

A 9 gram micro servo with at least 1.3 kg/cm of torque. The MA-90 meets that figure and costs $8.00.

Can a 5 gram servo fly a 40-inch plane?

Yes, on a small rudder or throttle linkage. The SG50 weighs 5g and gives 0.6 kg/cm, but ailerons need more torque.

Do metal gear servos last longer than plastic gear servos?

Yes, under shock loads such as hard landings. Plastic gears suit light foam planes with small loads.

What voltage do most micro servos use?

Most run on 4.8V to 6V from a receiver pack or BEC. Check the datasheet before you use a 2 cell lithium pack.

Sources

Last updated: November 10, 2026.

How to Balance Charge a LiPo Battery With an Adapter Cable

JST-XH balance extension leads in 20 cm lengths for 1S to 6S

Plug the power lead into the charger through an XT60 cable, then plug the balance lead into the balance port. The balance lead lets the charger read each cell and hold it at 4.20V. A 2S pack uses a 3-pin plug, and a 6S pack uses a 7-pin plug.

Extensions and adapters for 2S to 6S packs start at $5.99.

Quick facts

Part	Use	Fits	Price
JST-XH balance extension leads, 20 cm, 5 pieces	Adds 20 cm to a balance lead	1S to 6S	$7.37
JST to JST-XH balance adapter set	Adapts older JST plugs to JST-XH	2S to 6S	$5.99
2S-6S JST-XH balance charging adapter board	One board for many pack sizes	2S to 6S	$7.99
XT60 extension cable, 14AWG	Extends the main power lead	XT60 plugs	$6.31
XT60 parallel Y-splitter cable, 14AWG	Charges two packs in parallel	XT60 plugs	$8.49

What does a balance cable do?

A balance cable lets the charger read each cell on its own. A lithium-ion cell is full at 4.20V, and cells drift apart with age and use. Without a balance lead, the charger sees only the pack total and cannot fix a low cell.

Battery University advises charging energy cells at 0.5C to 1C, with a full charge taking about 2 to 3 hours.

Which adapter fits your pack?

Count the pins on the balance plug: cells plus one. A 2S pack uses a 3-pin plug, and a 6S pack uses a 7-pin plug. Most RC packs use JST-XH plugs, a 2.5 mm pitch connector rated at 3A with AWG 22 wire and 250V.

Match the plug to the balance port on your charger or adapter board. The adapter set here covers 2S to 6S for $5.99.

Extension lead, adapter set, or adapter board?

Option	Use it when	Price
Balance extension leads, 20 cm	The pack lead is too short to reach the charger	$7.37
JST to JST-XH adapter set	The pack plug does not match the charger port	$5.99
Balance charging adapter board	You charge many pack sizes on one charger	$7.99

Buy the extension when the lead is short. Buy the adapter set when the plugs differ. Buy the board when you charge 2S to 6S packs on one charger.

All three use the same JST-XH standard, so one set covers most packs.

How do you hook up a balance charge?

Set the charger to LiPo balance mode and the right cell count.
Plug the XT60 main lead into the charger, using an extension cable if the lead is short.
Plug the balance lead into the balance port or the adapter board.
Check the cell count on the charger screen before you start.
Start the charge and stay in the room while it runs.
Unplug both leads when the charger reports full at 4.20V per cell.

How do you protect a balance port from wear?

Plug a connector saver into the charger port and leave it there. The saver takes the wear from daily plug cycles, and you replace the saver instead of the charger port. A 2S saver 5-pack costs $4.50, and a 4S saver 5-pack costs $4.50.

Use the Y-splitter only for parallel charging, and only join packs with the same cell count and a close voltage.

Frequently asked questions

Can you charge a LiPo through the main lead only?

The charger cannot see single cells that way. It can charge, but it cannot balance. Use the balance lead every time.

What happens if the balance plug has the wrong pin count?

It will not fit, or the charger will misread the pack. A 3S pack uses a 4-pin plug. Count the pins before you plug in: cells plus one.

Can you parallel charge a 2S and a 3S pack together?

No. Parallel packs must share the same cell count. They should also sit at a close voltage before you join them.

Why does the charger show one cell lower than the rest?

Cells drift with age and use. A balance charge evens them out. If one cell stays far off after balancing, retire the pack.

Parts used

JST-XH 1S-6S balance extension leads, 20 cm, 5 pieces – $7.37
JST to JST-XH balance adapter set, 2S-6S – $5.99
2S-6S JST-XH balance charging adapter board – $7.99
XT60 extension cable, 14AWG – $6.31
XT60 parallel Y-splitter cable, 14AWG – $8.49
2S JST-XH balance connector saver, 5-pack – $4.50
4S JST-XH balance connector saver, 5-pack – $4.50
ImaxRC B3 Pro balance charger, 2S/3S – $15.99
B6 80W digital balance charger, T/Tamiya/XT60 plug – $49.99

Shop the full ranges: Batteries and Chargers and Connectors and Wiring at Quality RC Parts.

Related guide: LiPo Chargers guide.

In-stock parts ship from New York, USA in 1 to 2 business days.

Sources

Last updated: 2026-11-10.

How to Extend a USB Cable Without Losing Speed or Power

USB 3.0 extension cable, male to female, in 0.5 m to 3 m lengths

Use a USB 3.0 extension cable for runs up to 3 m. Join two USB-C cables with a female to female coupler when a longer cable is not on hand. A 0.5 m extension costs from $4.74, and a single coupler costs $4.62.

Keep the total length short, since USB 3.0 guidance caps 5 Gbps runs near 2 m.

Quick facts

Option	What it does	Lengths or packs	Price from
USB 3.0 extension cable	Male to female, adds reach	0.5 m to 3 m	$4.74
USB-C coupler	Joins two USB-C cables	1, 2, or 4 pack	$4.62

How far can you extend a USB 3.0 cable?

Keep the total run at or under 2 m when the link must hold 5 Gbps. Passive cable guidance runs up to 2 m for 5 Gbps and up to 1 m for 10 Gbps and 20 Gbps. The extension here sells in 0.5 m at $4.74, 1 m at $4.99, 2 m at $5.52, and 3 m at $6.03.

A 3 m run may negotiate down below 5 Gbps, so use it where top speed is not required.

When does a coupler beat a longer cable?

Use a coupler when you already own two short USB-C cables and need a longer run today. One coupler costs $4.62, two cost $4.83, and four cost $6.27. Each joint adds a point where the signal can weaken, so a single cable beats two joined cables for a permanent run.

The coupler is rated USB 3.1, so it passes 5 Gbps data. A coupler also helps when a cable end is hard to reach behind a desk.

Does an extension cut charging power?

An extension passes the 5V power from a USB 3.0 port along to the device. Longer runs drop more voltage, so a device that needs full power may charge slowly at the far end. This extension is a data cord for a laptop, a TV, an SSD, a camera, or a printer.

For fast charging, use a short USB-C cable rated for the watts your device draws.

How do you extend a USB cable?

Measure the gap and pick the shortest extension that covers it.
Plug the device cable into the female end of the extension.
Plug the male end into the computer or dock.
Test the link before you route the cable, and confirm it still runs at 5 Gbps.
If the device drops speed, shorten the run or remove the coupler.

Frequently asked questions

Can you chain two extensions together?

You can, but each joint can cut speed. Keep the total under 2 m for a 5 Gbps link.

Does a USB-C coupler pass video?

It passes what the joined cables carry. If either cable lacks video support, the joined run lacks it too.

Will a coupler work with a USB-C charger?

Yes, for charging. Check that both cables are rated for the watts your device draws.

Is a 3 m extension a bad buy?

Not bad. It trades top speed for reach. Use it for printers, cameras, and storage where 5 Gbps is not required.

Parts used

USB 3.0 extension cable, male to female, 0.5 m to 3 m – from $4.74 to $6.03
USB-C female to female coupler, USB 3.1, 1, 2, or 4 pack – from $4.62 to $6.27

Shop the full ranges: DJI Accessories and Connectors and Wiring at Quality RC Parts.

Related guide: DJI Tablet Mounts guide.

In-stock parts ship from New York, USA in 1 to 2 business days.

Sources

Last updated: 2026-11-10.

How to Pick the Right USB-C Data Cable for a Hard Drive

USB-A to USB-C 60W 10Gbps data transfer cable for phones and hard drives

Match the connector on your device, the data speed you need, and the shortest length that reaches. A hard drive with a Micro-B 3.0 port needs a USB-C to Micro-B cable. A dock with a USB-B port needs USB-C to USB-B.

USB 3.2 Gen 2 runs at 10 Gbps, and Gen 1 runs at 5 Gbps.

Quick facts

Cable	Connectors	Speed	Lengths	Price from
USB-A to USB-C data cable	USB-A to USB-C	10 Gbps	0.5 m to 2 m	$8.67
USB-C to Micro-B cable	USB-C to Micro-B	5 Gbps	0.5 m to 3 m	$6.57
USB-C to USB-B 3.0 cable	USB-C or USB-A to USB-B	5 Gbps	0.5 m to 3 m	$6.87
USB-C to USB 2.0 cable	USB-C to USB-A	480 Mbps	5 ft	$8.83

What speed do you need: 5 Gbps or 10 Gbps?

Buy 10 Gbps only when the host and the device both support it. USB 3.2 Gen 1 signals at 5 Gbps, and Gen 2 signals at 10 Gbps. Both figures are signaling rates, not promised copy speeds, and the host, the device, and the cable must all support the same mode.

The 10 Gbps cable here costs from $8.67 for 0.5 m and reaches $11.67 for 2 m. If either end runs at 5 Gbps, the link runs at 5 Gbps.

Which connector does your device use?

Check the port shape before you order, since USB-C describes the shape and not the speed. Portable hard drives often use Micro-B 3.0, a wide plug with a two-part face. Docks, printers, and external drive enclosures often use USB-B 3.0.

MIDI keyboards and audio interfaces often use USB-B 2.0 or USB-C. The Micro-B cable here costs from $6.57 for 0.5 m, and the USB-B cable costs from $6.87 for 0.5 m.

Does cable length change the speed?

Yes, length can pull a fast link down to a lower rate. Passive cable guidance runs up to 2 m for 5 Gbps and up to 1 m for 10 Gbps and 20 Gbps. A 3 m cable costs more and may negotiate down, so buy the shortest length that reaches.

The Micro-B cable runs from 0.5 m at $6.57 to 3 m at $13.32. The USB-B cable runs from 0.5 m at $6.87 to 3 m at $10.53.

Can one cable handle charging and data?

Yes, a USB-C cable can carry power and data on the same run. The USB-A to USB-C cable here charges at up to 60W while it moves data at 10 Gbps. A USB 2.0 cable tops out at 480 Mbps for data, which still leaves room for a MIDI keyboard.

MIDI traffic is light, so the 5 ft USB-C to USB 2.0 cable at $8.83 suits a controller or an audio interface.

How do you match a cable to a device?

Look at the port on the device and note its shape.
Check the device manual for its USB speed, 5 Gbps or 10 Gbps.
Pick the cable with matching connectors and at least that speed.
Pick the shortest length that reaches your computer or dock.

Frequently asked questions

Will a USB-C to Micro-B cable fit a USB 2.0 Micro-B port?

No. The Micro-B 3.0 plug is wider than a Micro-B 2.0 port, so it does not fit. Check the port shape on the drive before you order.

Is 10 Gbps twice as fast in real file copies?

No. 10 Gbps is a signaling rate, not a promised copy speed. Real copy speed depends on the drive, the host, and the workload.

Can you use the 10 Gbps cable with a phone?

Yes, if the phone has a USB-C port. The link runs at the lower of the phone port speed and the cable speed.

Why is the MIDI cable only USB 2.0?

MIDI data is light, so 480 Mbps is far more than a keyboard needs. The cable is built for the connector and the length, not for bulk data.

Parts used

USB-A to Type-C 60W USB 3.2 10Gbps data transfer cable, 0.5 m to 2 m – from $8.67 to $11.67
USB-C to Micro-B cable, USB 3.0 5Gbps, 0.5 m to 3 m – from $6.57 to $13.32
Type-C to USB-B 3.0 data cable, 0.5 m to 3 m – from $6.87 to $10.53
USB-C to USB 2.0 cable, 5 ft, for MIDI controller and audio interface – from $8.83 to $9.55

Shop the full ranges: DJI Accessories and Connectors and Wiring at Quality RC Parts.

Related guide: Connectors and Wiring guide.

In-stock parts ship from New York, USA in 1 to 2 business days.

Sources

Last updated: 2026-11-10.

How to Choose a USB-C Charging Cable for a DJI Drone

100W USB-C coiled cable with LED display and 90 degree connectors

Pick a USB-C to USB-C cable rated above the power your device draws, in the shortest length that reaches. A DJI RC 2 draws at most 27W, so a 60W cable covers it with room to spare. Coiled cables stay tidy in a car or bag, while straight cables cost less per metre.

Quick facts

Cable	Listed rating	Lengths	Price from
120W 7A USB-C to USB-C cable	120W, 7A	1 m, 2 m	$5.50
6A USB-C charging cable	6A	1 m to 8 m	$5.38
100W USB-C coiled cable with LED display	100W	1.5 m	$11.58
90 degree USB-C coiled cable	USB-C to USB-C	1.5 m	$7.87
120W nylon coiled USB-C cable	120W	1 m, 2 m	$7.08

How much power does a DJI RC 2 need?

A DJI RC 2 draws at most 27W through its USB-C port. DJI states the port takes up to 9V at 3A, and a full charge takes about 1.5 hours with a 9V/3A charger. The controller runs for up to 3 hours on that charge.

A cable rated at 60W or more covers the RC 2 with margin. The 100W and 120W cables here exceed it by far.

What does 100W or 120W on a cable mean?

The watt figure is a ceiling, not a forced output. USB Power Delivery tops out at 100W in its standard range (20V at 5A) and 240W in its extended range (48V at 5A). The charger, the cable, and the device agree on a level, and the weakest link sets the power.

Cables above 3A carry an e-marker chip that declares the 5A rating. A 120W cable rated at 7A uses a vendor fast-charge mode, so it reaches full speed only with a matching charger and phone.

Should you pick a coiled or a straight cable?

Pick a coiled cable when the cable lives in a car, a bag, or a pocket. The coiled cables here stretch to 1.5 m and snap back short, so they tangle less than a straight cable. The 100W coiled cable with an LED display costs $11.58, and the 90 degree coiled cable costs from $7.87.

Pick a straight cable when price per metre matters most. A straight 120W cable costs from $5.50 for 1 m, and a straight 6A cable costs from $5.38 for 1 m.

Which length should you buy?

Buy the shortest length that reaches from the charger to the device. Short cables cost less, tangle less, and drop less voltage over the run. A 1 m cable suits a desk or a power bank.

A 1.5 m or 2 m cable suits a car seat or a bag. The 6A cable runs from 1 m at $5.38 to 8 m at $13.77, which covers fixed runs across a room. The 120W cable costs $5.50 for 1 m and $7.12 for 2 m.

How do you charge a DJI RC 2 with a USB-C cable?

Plug the USB-C cable into the port at the bottom of the controller.
Plug the other end into a charger rated at 9V/3A or higher.
Watch the battery LEDs blink in sequence while it charges.
Unplug when the LEDs turn off, after about 1.5 hours.

Frequently asked questions

Will a 120W cable harm a DJI RC 2?

No. The controller draws at most 27W, and the cable rating is a ceiling. The charger and the controller agree on the power, so a higher rated cable changes nothing.

Can you use these cables for CarPlay?

The 100W coiled cable lists CarPlay use. Wired CarPlay runs over USB data, so check that your car head unit supports wired CarPlay first.

Do coiled cables charge slower than straight cables?

No. A coiled cable with the same rating delivers the same power. Length and rating set the limit, not the coil shape.

What charger should you pair with a 120W cable?

Pair it with a charger that supports the same fast-charge mode as your phone. A standard USB PD charger tops out at the PD level it supports.

Parts used

120W 7A USB-C to USB-C fast charge cable, 1 m or 2 m – from $5.50 to $7.12
6A USB-C charging cable, 1 m to 8 m – from $5.38 to $13.77
100W USB-C coiled cable with LED display, 90 degree, 1.5 m – $11.58
90 degree USB-C to USB-C coiled braided charger cable, 1.5 m – from $7.87 to $8.82
120W nylon coiled USB-C cable, USB-A or USB-C, 1 m or 2 m – from $7.08 to $8.28

Shop the full ranges: DJI Accessories and Connectors and Wiring at Quality RC Parts.

Related guide: DJI RC Accessories guide.

In-stock parts ship from New York, USA in 1 to 2 business days.

Sources

Last updated: 2026-11-10.