IR Module

IR Module is a module which is use to detect obstacle.An IR module uses a comprator. which is use to compare the output of photodiode with output of preset. when output of photo diode is greater than the voltage applied at non-inverting pin of comparator, the output of comparator is goes to high. but if output of photo diode is not exceed the output of preset then the output of comparator is zero volt.

Circuit of IR Module

The output of photo diode is changes with change in intensity of incoming ir Light coming from IR LED. ir light is reached at photo diode after reflection by object placed in front of ir module.

so we can change range of ir module by change in voltage applied at non-inverting pin.