Ir Led Obstacle Detection Circuit

November 11, 2019

An ic op amp is used as a voltage comparator. Ir sensor circuit basically consist an ir led and a photodiode this pair is generally called ir pair or photo coupler.

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Ir sensor work on the principal in which ir led emits ir radiation and photodiode sense that ir radiation.

Ir led obstacle detection circuit. Circuit of this ir detector is given below. The ir object detection sensor module is quiet easy to make. Infrared ir sensor using lm358 august 7 2010 by ashutosh bhatt this project and its circuit are one of the most basic and popular sensor modules.

Ir led emits infrared light. When the ir sensor circuit is switched on ir led starts emitting the infrared which falls upon the photodiode and a potential difference is generated across photo diode which turns on the transistor bc547 which further turns on the transistor bc557 by pulling down its base to ground. A typical ir sensing circuit is shown below.

We will use a photodiode and ir led to make a simple circuit. The photodiode detects the infrared light. This sensor circuit below is a low cost low range infrared object detection module that you can easily build at home using ir leds.

Obstacle sensing circuit or ir sensor circuit. In electronics this sensor is analogous to humans visionary senses which can be used to detect an obstacle which is one of its common applications. The maximum input voltage is 5 volts.

For supply voltage of 9v or more use 1k resistor for led and 470r for infraredir led. In the same manner when the object moves farther from the ir proximity sensor the voltage at non inverting input reduces and at some point becomes less than inverting input which causes opamp to turn off the led. It consists of an ir led a photodiode a potentiometer an ic operational amplifier and an led.