PicoRuby RC Car

A BLE-controlled RC car powered by PicoRuby on a Raspberry Pi Pico2 W. Control it wirelessly from your browser using a virtual joystick.

Materials

Part	Link
RC Car Chassis	https://akizukidenshi.com/catalog/g/g113651/
Raspberry Pi Pico2 W	https://akizukidenshi.com/catalog/g/g130330/
DRV8835 Motor Driver Module	https://akizukidenshi.com/catalog/g/g109848/
Breadboard	https://akizukidenshi.com/catalog/g/g100315/
Jumper Wires (any wires will do)	https://akizukidenshi.com/catalog/g/g102315/
Battery Box	https://akizukidenshi.com/catalog/g/g111523/
2x AA Batteries	-

Wiring

Connect the Raspberry Pi Pico2 W to the DRV8835 motor driver module:

Pico GPIO	DRV8835	Function
GP5	AIN1	Right Motor Forward
GP6	AIN2	Right Motor Reverse
GP7	BIN1	Left Motor Forward
GP8	BIN2	Left Motor Reverse

Flashing

Use the PicoRuby Terminal to write the firmware to your Raspberry Pi Pico2 W.

1. Write car.rb as /home/app.rb on the Pico2 W (Plain text)
2. Write ble_uart.rb as /lib/ble-uart.mrb on the Pico2 W (Compile mode, not Plain)

Usage

1. Power on the RC car
2. Open the controller page: https://hayaokimura.github.io/picoruby-rc-car/
3. Click the Connect button to pair with the RC car via BLE
4. Drag the joystick knob to drive!

Note: Safari on iPhone does not support the Web Bluetooth API. To control the RC car from an iPhone, use a Web Bluetooth compatible browser such as Bluefy.

License

MIT