Hopefully you find it and let us know.
Forrest Mims was the first to propose using the LED as a sensor in the early 70s, not long after LEDs became common.
https://hackaday.com/2015/10/13/citizenscience/
governments burn libraries
Hopefully you find it and let us know.
Forrest Mims was the first to propose using the LED as a sensor in the early 70s, not long after LEDs became common.
https://hackaday.com/2015/10/13/citizenscience/