Interfacing infrared ranger module and object detection using GP2D120 IR sensor and PIC microcontroller Functioning of the IR Ranger Module There are several ways of Measuring range. The easiest way is by using sound waves where ultrasonic sound is fowarded, and is reflected when hit by an object and the time it takes to reflect back is measured. Sounds waves do not travel fast, and can be measured by present day equipment. However, in the case of infrared light , the time it takes to hit an obstacle and reflect back can not be measured because infrared light travels fast. An IR transmitter emits infrared light to the object in front, by passing through a condense lens . Refraction occurs once the light hits the surface of the object. Part of the refracted light falls on the receiver end which is then passed to another lens and processed by an array of photo-transistors . Hence, the position in which the light falls can be used to calculate the distance of an obstacle from ...
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