henSo I am an EE student and I like projects a lot. Anyways, I serve and bartend at a restaurant and when I am bar tending, whenever drinks are rung in, we have a printer that prints off a receipt with whatever needs to be made. Anyways, sometimes it's not very obvious when receipts come up so I was wanting to make a sensor that would be able to tell when a receipt was printed and then light up an LED as an indication, my initial idea is this:
The sensor would have an infrared LED which would sit on top of the printer, when a receipt came up the infrared LED would reflect off the paper and an infrared detector would detect that certain threshold of reflected light and therefore light up and LED.
I was wondering if you think this would work and how the circuit design would be as far as the infared detector. I would think it would use like an IR phototransistor, but I have not taken electronics class yet (will be this fall) so I don't have much experience with designing semi conductor type circuits. So please let me know what you think.
The sensor would have an infrared LED which would sit on top of the printer, when a receipt came up the infrared LED would reflect off the paper and an infrared detector would detect that certain threshold of reflected light and therefore light up and LED.
I was wondering if you think this would work and how the circuit design would be as far as the infared detector. I would think it would use like an IR phototransistor, but I have not taken electronics class yet (will be this fall) so I don't have much experience with designing semi conductor type circuits. So please let me know what you think.