https://chrisruppel.com/blog/lilypad-arduino-light-sensor-pulse-width-modulation/
LilyPad Arduino and light sensors - Chris Ruppel
Personal website of Chris Ruppel.
lilypad arduinolight sensorschris ruppel
https://www.sparkfun.com/lilypad-arduino-usb-atmega32u4-board.html
LilyPad Arduino USB - ATmega32U4 Board - SparkFun Electronics
SparkFun Electronics is an online retail store that sells the bits and pieces to make your electronics projects possible.
lilypad arduinosparkfun electronicsusbatmega32u4board