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Principle of InfraRed

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oasacorp

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I am new to electronics. Recently, I bought an IR RX/TX. I would like to know the principle behind it so as to detect object. After surfing on net i understood that the Transmitter transmits and it gets reflected( if some object is there) and this is picked up by the RX. My doubt is what changes in the RX LED :S In one of the example I saw Obstacle Detection Using IR-led-Photodiode , the IR is connected to an ADC. So the voltage changes (assuming its the voltage that is converted to digital)?? Please let me know of it. Also I dont know where to use transistors, capacitors and resistors and what values. How do you know where to use these ? In the above example what is the role of the transistor ?. Please let me know if you can help.

Thanks in advance

P.S. I am really stupid :p
 
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Thanks. I actually know all the basic theories. But when it comes to application i dont know. :(
 

It’s a long way, but electronics is simple to understand with step by step guides on what to do or where to go to find helpful information.
Need to start with small projects and combining some theory and practice experiments you will learn through each project to find out about voltage, current, resistance, capacitors, transistors, diodes, and more.
 

If you read these guides first,
then we examine the transistors

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---------- Post added at 13:28 ---------- Previous post was at 11:58 ----------

BJT as a switch

How a Bipolar Junction Transistor Works
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https://techhouse.org/~dmorris/projects/tutorials/transistor.switches.pdf

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BJT as an amplifier

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PS. Here is simple circuit simulator and lots of circuits for testing .
Change component values and measure function of changes to the circuit
and you can create your own circuits too.

Try this................
Circuit Simulator Applet

Regards KAK
 
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