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Led controller for STM32F103C6T8 (Blue Pill)

Requirements

Any STM32F103C6T8 board (like Blue Pill or SMT32_Smart) and STM32CubeIDE

Pins

  • wsb2812b: connect 5V and GND to your power, and Data to PA7

Connection

One of either:

  • USB's port (/dev/ttyACM0 on Linux; any high baudrate)
  • UART through PA10 (baudrate: 38400, parity: none, stop bits: 1)

Protocol

Send 1 byte with number of pixels (n), then n pixel colors (RGB, one byte each).

Node code:

var Protocol = require('bin-protocol');
var protocol = new Protocol();

protocol.define('frame', {
    write (colors) {
        this.Int8(colors.length)
        for(let c of colors) {
            this.UInt8(c[0])
            this.UInt8(c[1])
            this.UInt8(c[2])
        }
    }
})
//display is array of RGB pixels [0-255]
let colorsData = protocol.write().frame(display).result
port.write(colorsData)

Known problems

  • Doesn't work in USB HUBs

Supports up to 120 LEDS 150Hz.