Infrared Proximity Obstacle Detector Using Opamp

 

IR (InfraRed) proximity sensor / Obstacle detector circuit using LM358 opamp

Components Required:

1. LM 358 IC
2. 1 InfraRed LED PhotoDiode pair
3. Resistors: 2 x 270R, 10K
4. Potentiometer: 10K
5. Breadboard
6. Power Supply: (3-12)V
7. Few Breadboard connectors

Circuit Diagram:

[Note: For supply voltage of 9V or more, use 1K resistor for LED and 470R for InfraRed(IR) LED.]