LEDs can effectively be used as light sensors when wired in reverse - About a decade ago there was a post where someone turned an 8x8 LED matrix into a touch se

LEDs can effectively be used as light sensors when wired in reverse - About a decade ago there was a post where someone turned an 8x8 LED matrix into a touch sensor. Edit: Found the link, here it is: https://mrl.cs.nyu.edu/~jhan/ledtouch/index.html https://mrl.cs.nyu.edu/~jhan/ledtouch/index.html Analog Devices has an excellent article about using LEDs as sensors in this way: https://wiki.analog.com/university/courses/electronics/electronics-lab-led-sensor https://wiki.analog.com/university/courses/electronics/elect...