Introduction
MicroPython is a tiny open source Python dialect that runs on microcontrollers - like the Adafruit Feather nRF52840 microcontroller that I use for developing xSpectre’s handheld spectrometer.
Micropython pin labels for Adafruit nRF52480 Express
The naming of the pins, both for Arduino IDE and CircuitPython, for the Adafruit nRF52480 Express board is here.
Neopixel blinking
The python script below loops a rainbow colored sequence for the Adafruit Neopixel Red-Green-Blue light on the Adafruit nRF52480 Express board.
"""
Rainbow Blink example for NeoPixel LED Arduino Feather Express.
Includes QT Py and various Trinkeys.
Requires two libraries from the Adafruit CircuitPython Library Bundle.
Download the bundle from circuitpython.org/libraries and copy the
following files to your CIRCUITPY/lib folder:
* neopixel.mpy
* adafruit_pixelbuf.mpy
Once the libraries are copied, save this file as code.py to your CIRCUITPY
drive to run it.
"""
import time
import board
import neopixel
rgbPixel = neopixel.NeoPixel(board.NEOPIXEL, 8, brightness=0.1)
loopnr = 0
outerloopnr = -1
RED = (255, 0, 0)
YELLOW = (255, 150, 0)
GREEN = (0, 255, 0)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
while True:
print(loopnr)
# Step rgbpixel values blue - green - yellow - red - purple - blue
if loopnr % 6 == 0:
red = 0
green = 0
blue = 100
rgbPixel.fill(BLUE)
outerloopnr += 1
elif (loopnr-outerloopnr*6) % 5 == 0:
red = 0
green = 100
blue = 0
rgbPixel.fill(CYAN)
elif (loopnr-outerloopnr*6) % 4 == 0:
red = 100
green = 100
blue = 0
rgbPixel.fill(GREEN)
elif (loopnr-outerloopnr*6) % 3 == 0:
red = 100
green = 0
blue = 0
rgbPixel.fill(YELLOW)
elif (loopnr-outerloopnr*6) % 2 == 0:
red = 100
green = 0
blue = 0
rgbPixel.fill(RED)
else:
red = 100
green = 0
blue = 100
rgbPixel.fill(PURPLE)
rgbPixel.show()
time.sleep(0.5)
loopnr += 1