Datasheet

Playground Light Sensor
The Circuit Playground Express can see you! OK, not really. That would be creepy.
But, it can sense light and dark, as well as colors and even your pulse!!
The Light Sensor in the upper left of the board (look for the eye icon) is a phototransistor. Here's how to use it as a
light sensor:
© Adafruit Industries https://learn.adafruit.com/adafruit-circuit-playground-express Page 166 of 211