ir sender-receiver circuit

[antoine magdi]

ir sender

Hello every one!

i want to ask a question, is an ir led receiver like an ir led sender, but only in each configuration the ir led does its role?!

plz also tell me what's the simplest configuration to design ir sender-receiver electronic circuit sensing if the ir level is over or less a predefined threshold level?!

thanks in advance!

 

[dsPIC24F]

led receiver circuit

There are some packages with both sender and receiver.

 

[flatulent]

ir diode receiver

The sender is usually a LED diode made from material that emits photons in the IR range. The receiver is usually a PIN diode or a transistor. The design allows the IR photons to illuminate the reverse junction area in the diode or the base in the transistor.

For the sender you have a voltage source with a current limit. For the receiver you have the transistor with the usual BJT circuit and the photocurrent flows out the collector through a resistor which makes a voltage. For the diode receiver, you reverse bias it through a resistor and the photo current flows through the resistor which makes a voltage.