This project explains how to build a simple, reliable Infrared (IR) Proximity Sensor circuit at home. This sensor detects the presence of an object within a short range by emitting invisible infrared light and looking for the light reflected back.
Components Required:
- IC-LM358 ►https://amzn.to/33LsOnk
- IR Transmitter & IR Receiver -(1)► https://amzn.to/3eQh7BW
- Resistors- 100Ω-(1), 10KΩ-(1) & 220Ω-(1) ►https://amzn.to/3huG2wC ►https://amzn.to/3fmHrCL ►https://amzn.to/3weTCbx
- Variable resistor-10 KΩ-(1) ►https://amzn.to/3yjr7eC
- LED-(1) (Any color) ►https://amzn.to/3hvx8Pv
- Buzzer ►https://amzn.to/3froPS2
- Battery & Clip ►https://amzn.to/3tS046Z
Working Principle: Emission and Detection
The circuit operates using the principle of reflection to determine proximity:
- An IR proximity sensor is like a tiny invisible flashlight and a special eye that work together to know when something is nearby—without touching it.
- Here’s what happens inside the sensor: It sends out a beam of invisible light called infrared light. This light travels forward until it hits an object, such as your hand or a toy nearby. When the light hits the object, it bounces back toward the sensor.
- The sensor’s “eye” is always watching for this bounced-back light. If it sees the reflection, it knows something is close. This information can then be used to switch on lights, sound alarms, or control other parts of a project.
- The closer the object is, the stronger the returned light, so the sensor can tell how near something is. It’s like having a robot friend who can sense when you’re close by just by shining a secret light and waiting for it to come back!
Applications
This simple proximity sensor circuit is highly versatile and forms the basis for:
- Counting Systems: Counting objects moving along a conveyor belt.
- Line Following Robots: Detecting a colored line on the floor.
- Automation: Non-contact switches in various devices.
- Anti-Collision Systems: Basic obstacle avoidance for small vehicles or robotics.
Watch the full video tutorial here: How to make an Object detector / IR Proximity sensor at home