Here we show the same characterization made for the infrared sensor also for the ultrasonic sensor. The sensor chosen is the LV-MaxSonar-EZ1. This sensor has a range distance from 0 to 600 cm,a resolution of 2.5 cm frequency of 20 Hz and an analogical output that goes from 0 to 5 V. It is important to notice that the working frequency of this sensor is greater than that of the infrared sensors and it represents also the minimum time cycle for the loop of the processing.