Datasheet

CircuitPython

It's easy to read how much light a photocell sees with CircuitPython and its built-in analog input

support (https://adafru.it/CbI). By wiring the photocell to an analog input of your board you can read the voltage from it

and see how it changes as the amount of light hitting the sensor changes too.

First wire up a photocell to your board as shown on the previous page for Arduino. You'll want to setup the same

voltage divider with a 10 kilo-ohm resistor circuit and feed the output into any analog input on your board (note the

special method of reading photocells without an analog input is not currently supported by CircuitPython).

Here's an example of wiring a photocell to a Feather M0:

Board 3.3V to one leg of the photocell (doesn't matter which leg). Note you want to use the voltage from your

board that corresponds to the maximum analog input voltage. For Feather boards this is 3.3V, but for other

boards it might be higher or lower--consult your board documentation to be sure.

10 kilo-ohm resistor to the other leg of the photocell.

Board GND to the other leg of the 10 kilo-ohm resistor.

Board A1 (or any other analog input) to the junction of the photocell & 10 kilo-ohm resistor.

Next connect to the board's serial REPL (https://adafru.it/pMf)so you are at the CircuitPython >>> prompt.

Now import the board and analogio modules that allow you to read an analog input. Be sure you've read

the CircuitPython analog I/O guide (https://adafru.it/CbJ) for more background on using analog inputs too!

Create an analog input for the A1 pin connected to the photocell & resistor junction:

import board

import analogio