Noise is everywhere. This world is made of noise. This is what everybody related to sensors will constantly repeat. But what is noise? It's unexpected data generated by sensors or signal sources. It can completely ruin the behavior of an autonomous system if not treated properly.

Here, we will use the implementation from the Measuring distance – infrared and ultrasonic recipe. The Sharp IR is known for its interference with basically anything, and here we will explore two standard methods of filtering the data generated by the sensor.