all. I know enough about soldering and circuits to be dangerous, meaning I can follow instructions, but I could not design my way through an open door.
I am interested in using an IR Break Beam Sensor (3.3v 20ma to power it--details https://www.adafruit.com/products/2167 ) to cause an LED to turn ON when the beam is detected, not when the beam is broken. Basically, I want to detect when a roll of paper is NOT between the two sensors and then have an LED stay on (or blink would be better). I should be able to do this simply, no? It needs to run 24/7 but the beam most of the time will not be broken. Any circuit guidance would be appreciated and then I will try to figure out what kind of battery power i would need. Oh, when the paper is replaced, I would want the circuit to turn off the LED. The paper is definitely thick enough to block the beam. Thanks for any guidance/resources. -Bob