An infrared sensor is an electronic instrument which is used to sense certain characteristics of its surroundings by either emitting and/or detecting infrared radiation. Infrared sensors are also capable of measuring the heat being emitted by an object and detecting motion.The IR LED emits 940nm wavelength, has radiant power output 16mW at 100ma (max 1.2A), forward voltage 1.2V, and viewing angle to 1/2 intensity 45°. The IR receiver module has passband 950nm±50nm and supply voltage and current of 2.4-5.5V and 0.6ma (under no signal output), respectively. The infrared light (IR) is based on the principles of optics. An IR proximity sensor works by applying a voltage to a pair of IR light emitting diodes (LED's) which in turn, emit infrared light. This light propagates through the air and once it hits an object it is reflected back towards the sensor.
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