A tutorial on How to make an InfraRed (IR) proximity sensor circuit along with detailed explanation on how the circuit works. The sensitivity or Range of detection can be controlled by adjusting the potentiometer.

This circuit can also function as an InfraRed receiver and Object detector.
For circuit diagram plus more Info, visit:
https://elonics.org/infrared-ir-proxi...

Components Required:
* LM 358 IC
* 1 InfraRed LED PhotoDiode pair
* Resistors: 2 x 270R, 10K
* Potentiometer: 10K
* Breadboard
* Power Supply: (3-12)V
* Few Breadboard connectors
Note: For supply voltage of 9V or more, use 1K resistor for LED and 470R for InfraRed(IR) LED.

This channel has a lot more electronics projects & 555 timer projects. So feel free to check them.

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Troubleshooting Guide:
[Update]:    • Troubleshooting IR Proximity Sensor /...  

* Double-check all connections by referring to the circuit diagram.
* Check if the LED's are working properly. (Digital cameras can detect InfraRed light, so you can check if the InfraRed LED is working by using any digital camera)
* The IR photo-diode used in this video is white and the IR LED is black. But it can also be the other way in your case. You can determine which one is LED/Photo-diode by connecting both the diode, photo-diode pair separately to the power supply (via a 220 resistor) and see which one glows using a digital camera.
*At one extreme position of the potentiometer's knob, the LED should be off and at the other extreme position, the LED should be on. Now you can start turning the potentiometer's knob form the extreme position where the LED is on, until the LED just turns off. Now the IR proximity sensor should work properly.
*If the above steps doesn't help, feel free to post the problem in the comments section.
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