IR Proximity Sensor

The IR Proximity Sensor Circuit is designed to detect nearby objects using an IR LED, photodiode, and an LM358 operational amplifier. The circuit works by emitting infrared light from the IR LED, which reflects off nearby objects and is detected by the photodiode. The reflected IR light causes a change in the photodiode’s resistance, which is then processed by the operational amplifier (LM358) to determine the proximity of the object.

The LM358 amplifies the signal from the photodiode, and the resulting output is sent to an LED that indicates the presence of an object. The circuit uses a resistor in series with the IR LED to limit current and prevent damage. A battery powers the circuit, ensuring portability and ease of use in various applications. This sensor is commonly used in systems where object detection and proximity sensing are required, such as security alarms, robotics, and automated systems.

This simple and efficient design provides reliable proximity detection.