Hey folks, I have a set of infrared beam devices, where one sends a beam to another which is the receiver. The receiver has an inbuilt relay. I want to to be able to get the arduino to do something when the beam is broken. I have tried pushing a digital high signal into the relay and listening fo…

Infrared Beam Relay

system April 28, 2014, 9:52am 3

Ok, i fogot to mention i am new to electronics.
Where would i need a pulldown/pullup resistor? I dont think i have one - i certainly haven't installed one. What is its purpose?

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Infrared Beam Relay

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