2020年5月28日 (木)

NeoFlashをCircuitPythonで動かす

2020/5/28

CircuitPython NeoFlash

概要

以下のNeoFlashをCircuitPythonで動かす。ここでは、Feather-M4-ExpressのCircuitPythonを使用する。なお、NeoFlashは、M5StickC用であるが、neopixel互換なので neopixelとして動かす。 (以下、ホストPCとしてはubuntuを想定している)

M5StickC NeoFlash Hat

##　接続以下のように接続する：

NeoFlash	FeartherM4
GND	GND
5V0	3.3V
G26	D4

本来、5V動作のようだが、3.3Vでも動作する。

デモ・スクリプト


  import time
  import board
  import neopixel

  # On CircuitPlayground Express, and boards with built in status NeoPixel -> board.NEOPIXEL
  # Otherwise choose an open pin connected to the Data In of the NeoPixel strip, i.e. board.D1
  #pixel_pin = board.NEOPIXEL
  pixel_pin = board.D4

  # The number of NeoPixels
  num_pixels = 126

  # The order of the pixel colors - RGB or GRB. Some NeoPixels have red and green reversed!
  # For RGBW NeoPixels, simply change the ORDER to RGBW or GRBW.
  ORDER = neopixel.GRB

  pixels = neopixel.NeoPixel(
      pixel_pin, num_pixels, brightness=0.2, auto_write=False, pixel_order=ORDER
  )


  def wheel(pos):
      # Input a value 0 to 255 to get a color value.
      # The colours are a transition r - g - b - back to r.
      if pos < 0 or pos > 255:
          r = g = b = 0
      elif pos < 85:
          r = int(pos * 3)
          g = int(255 - pos * 3)
          b = 0
      elif pos < 170:
          pos -= 85
          r = int(255 - pos * 3)
          g = 0
          b = int(pos * 3)
      else:
          pos -= 170
          r = 0
          g = int(pos * 3)
          b = int(255 - pos * 3)
      return (r, g, b) if ORDER in (neopixel.RGB, neopixel.GRB) else (r, g, b, 0)


  def rainbow_cycle(wait):
      for j in range(255):
          for i in range(num_pixels):
              pixel_index = (i * 256 // num_pixels) + j
              pixels[i] = wheel(pixel_index & 255)
          pixels.show()
          time.sleep(wait)


  while True:
      # Comment this line out if you have RGBW/GRBW NeoPixels
      pixels.fill((255, 0, 0))
      # Uncomment this line if you have RGBW/GRBW NeoPixels
      # pixels.fill((255, 0, 0, 0))
      pixels.show()
      time.sleep(1)

      # Comment this line out if you have RGBW/GRBW NeoPixels
      pixels.fill((0, 255, 0))
      # Uncomment this line if you have RGBW/GRBW NeoPixels
      # pixels.fill((0, 255, 0, 0))
      pixels.show()
      time.sleep(1)

      # Comment this line out if you have RGBW/GRBW NeoPixels
      pixels.fill((0, 0, 255))
      # Uncomment this line if you have RGBW/GRBW NeoPixels
      # pixels.fill((0, 0, 255, 0))
      pixels.show()
      time.sleep(1)

      rainbow_cycle(0.001)  # rainbow cycle with 1ms delay per step