These output voltages are received by the controller from OUT pin of this module. Similarly, when intensity is decreased then resistance is decreased so the output voltages are increased. This means that when the intensity is increased then the resistance of this module is increased therefore the output voltages are dropped. In other words, this light intensity is inversely proportional to output voltages. This reflected portion has some light intensity and based on this intensity the output of this infrared obstacle avoidance sensor module is defined. So, the reflected portion of the infrared light is received by the IR receiver. When an IR transmitter emits the infrared light during the presence of an object, then some portion of this infrared light is reflected back to the IR transmitter after the collision with the object.
As this sensor consists of one IR transmitter and one IR receiver, therefore, the main work is done by them. The working principle of this infrared obstacles sensor module is very simple. Working Principle of Infrared Obstacle Avoidance Sensor Module
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