Infrared (IR) Sensor
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The infrared sensor is used to detect obstacles by measuring distance using infrared radiation. The distance measured however is limited to 80cm.
It has a transmitter and a receiver of radiation. The output signal differs in accordance to the obstacles.
It remains high ‘1’ when there are no obstacles and low ‘0’otherwise. There is also a red led on its back that glows purple when it meets an obstacle.

Connecting the IR Sensor
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The wires of the sensor are as follows:

	- Red – 5V
	- Green – GND
	- Yellow – Digital output

In this example:
	1. Red wire is connected to pin#2
	2. Green wire is connected to pin#6
	3. Yellow wire is connected to pin#7

The wiring of the Raspberry Pi to the breadboard, and the sensor is shown the figure below:

    .. image:: Circuits/infraredsensor.jpg
		:align: center


		
Python Program to Show Obstacle Detection
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    .. literalinclude:: Code/infraredsensor.py
       :linenos:
       :language: python