Datasheet

Copy and paste that code into a text editor and then save it to your Circuit Playground Express as code.py.

The code reads the light sensor and then lights up the NeoPixels like a bar graph depending on the light level. Try

waving your hand over it, or shining it with a flashlight to see it change!

# CircuitPlaygroundExpress_LightSensor

# reads the on-board light sensor and graphs the brighness with NeoPixels

import time

import board

import neopixel

from analogio import AnalogIn

from simpleio import map_range

pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, auto_write=0, brightness=.05)

pixels.fill((0, 0, 0))

pixels.show()

analogin = AnalogIn(board.LIGHT)

while True:

# light value remaped to pixel position

peak = map_range(analogin.value, 2000, 62000, 0, 9)

print(analogin.value)

print(int(peak))

for i in range(0, 9, 1):

if i <= peak:

pixels[i] = (0, 255, 0)

else:

pixels[i] = (0, 0, 0)

pixels.show()

time.sleep(0.01)