Micro:bit Rainbow Lighting (with Expansion Board)

Demo

Code

Library

1. Because I use Expansion Board, please add Neopixel extension in your micro:bit editor (https://makecode.microbit.org/pkg/microsoft/pxt-neopixel)

Block code

• This is the block code, you can click Edit button to check the code.

Python code

• If you prefer Python, the following is the code. (I use block only to develop this.)

   1run = 0
   2item: neopixel.Strip = None
   3
   4def on_button_pressed_a():
   5    global run, item
   6    run = 1
   7    while run == 1:
   8        item = neopixel.create(DigitalPin.P2, 24, NeoPixelMode.RGB)
   9        item.show_rainbow(1, 360)
  10        for index in range(30):
  11            item.show()
  12            item.rotate(1)
  13            basic.pause(50)
  14input.on_button_pressed(Button.A, on_button_pressed_a)
  15
  16def on_button_pressed_b():
  17    global run
  18    item.show_color(neopixel.colors(NeoPixelColors.BLACK))
  19    item.clear()
  20    run = 0
  21input.on_button_pressed(Button.B, on_button_pressed_b)
  22
  23def on_forever():
  24    pass
  25basic.forever(on_forever)
  

Q&A

1. If you get error code 207

   If you get error code 207 during downloading, it means you are using Micro:bit V1 (You can reference error code from https://makecode.microbit.org/device/error-codes)

Reference

• https://github.com/YahboomTechnology/RGB-LED-Circular-expansion-board
• https://www.circuspi.com/index.php/2019/08/15/mooncarlesson3/ (Chinese)
• https://www.elecfreaks.net/learn-cn/microbitKit/experiment_box/experiment_box_case_10.html (Chinese)

Where to buy

• https://category.yahboom.net/products/rgbledb
• Taiwan: https://www.taiwansensor.com.tw/product/microbit-%E7%92%B0%E5%BD%A2-rgb-%E7%87%88%E6%93%B4%E5%B1%95%E6%9D%BF/