This sounds like a fun project. Somebody already did it, apparently: https://hackaday.com/2012/07/30/reading-punch-cards-with-an-arduino-and-digital-camera/ htt

This sounds like a fun project. Somebody already did it, apparently: https://hackaday.com/2012/07/30/reading-punch-cards-with-an-arduino-and-digital-camera/ https://hackaday.com/2012/07/30/reading-punch-cards-with-an-...