I am Designing a project to use An IR remote and i am confused about the receiver. I noticed some have two legs such as this
And others have 3 legs as seen in this one
Can someone tell me the difference?
Infrared Receiver
infrared
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Best Answer
The Ebay one is an IR Photodiode, a diode that is sensitive to IR input.
The Sparkfun one is an IR Receiver, for Modulated IR. It takes a modulated IR signal, and strips the modulation, passing any digital signal inside to another IC. Typically used in Remote Control setups. The wiki page for the RC-5 Remote Control protocol provides a good explanation of how an IR Receiver works.
An Photodiode is a dumb analog part. A IR Receiver is a digital part (though it may have analog circuits inside).
For a remote code receiver, you need a IR Receiver. It requires a modulated signal in order to tell the difference between an intentional signal like a remote, and noise from lights in the room.