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A photo-diode is a diode who's leakage current gradually increases with the amount of IR that hits it.
It's used by placing it reverse-biased with a series resistor to measure the leakage current through the diode.
When forward-biased, it acts like a regular diode.
A photo-transistor is simply a transistor that "turns on" when IR hits it.
It's basically a normal transistor that has it's BE diode exposed to incoming light.
An IR receiver is an IC that reacts to IR signals that are pulsed at a certain frequency.
For example, TV remotes pulse their IR emitters as a set frequency then modulate the button commands over this frequency.
The receiver reacts only to IR light pulsed as this frequency to avoid interference from steady sources of IR.
Hi all,
im confused with IR Receiver, photo diode and photo transistor,
i know that all of this can pass a IR light,
but i don't know if what are there differences to each other?
please give me a reason when to use them..
i know that all of this can pass a IR light
The datasheet shows and explains all the parts inside an IR receiver IC:can you show me how to use an IR Receiver, because im searching in google but it seems that i don't understand them very much.
A photo-diode is a diode who's leakage current gradually increases with the amount of IR that hits it.
It's used by placing it reverse-biased with a series resistor to measure the leakage current through the diode.
When forward-biased, it acts like a regular diode.
A photo-transistor is simply a transistor that "turns on" when IR hits it.
It's basically a normal transistor that has it's BE diode exposed to incoming light.
An IR receiver is an IC that reacts to IR signals that are pulsed at a certain frequency.
For example, TV remotes pulse their IR emitters as a set frequency then modulate the button commands over this frequency.
The receiver reacts only to IR light pulsed as this frequency to avoid interference from steady sources of IR.