Deep Fried Neurons Happy Hour Micro-expression to Macro-expression LED headband

DFN-headband.py

#
# Deep Fried Neurons Happy Hour
#  Micro-expression to Macro-expression LED headband
#  @todbot 2020
#
import time
import board
import neopixel
import supervisor
import sys
import time

# Configure
PIXEL_PIN = board.D1  # pin that the NeoPixel is connected to
ORDER = neopixel.GRB  # pixel color channel order
COLOR = (100, 50, 150)  # color to blink
CLEAR = (0, 0, 0)  # clear (or second color)
DELAY = 0.5  # blink rate in seconds

pixels = neopixel.NeoPixel(PIXEL_PIN, 3, pixel_order=ORDER)
pixels.brightness = 0.25

pindex = 0  # index into pixel array of LED to actuate

def serial_read_pindex():
    global pindex
    value = ""
    if supervisor.runtime.serial_bytes_available:
       value = sys.stdin.read(1)
       if value:
           print("read char:",value)
           try:
               pindex = int(value) - 1
           except ValueError:
               print("not a number")
   
ledTime = time.monotonic()
# Loop forever and blink the color
while True:
#    print("hi")
    # if we have a good pindex, use it
    if pindex >= 0 and pindex < 3:
        ledTime = time.monotonic()
        pixels[pindex] = COLOR
        pindex = -1 # off
    # turn off LED after 1 second
    if time.monotonic() - ledTime > 1.0:
        pixels.fill(0)
   
    serial_read_pindex()