Speed Wheels BLE Adruino

An Arduino Sketch that controls the wheels/motor (using the DRV8871 Motor Driver) and the 12 LED NeoPixel Ring using Bluetooth Low Energy (BLE).

I had some problems to solve that I documented in a dev.to article: https://dev.to/nicomartin/neopixels-on-the-arduino-nano-rp2040-3po6

Circuit

BLE Services

The Arduino exposes a Bluetooth Low Energy Server with to Services:

Motor control

UUID: c10e3e56-fdd3-11eb-9a03-0242ac130003
motorCharacteristic: 35a1022c-fdd3-11eb-9a03-0242ac130003 - BLERead | BLEWrite

Accepts two bytes between 0 and 200, each byte represents one wheel where the speed goes from 0 (full speed backward) to 100 (stop) to 200 (full speed forward).

LED control

UUID: 90c554cb-1640-44d6-88ee-85a5eb8ace90
ledCharacteristic: f601d5ac-c20b-4917-9cfc-28788d4454be - BLERead | BLEWrite

A one-byte characteristic where you can set one of seven LED-modes.

Remote Control

There is a second project for a browser-based remote control that uses the WebBluetooth API to communicate with the provided BLE server.

Demo: https://speed-wheels.nico.dev/
Source: https://github.com/nico-martin/speed-wheels-ble-ui