The BenchBot is equipped with 8 ultrasonic sensors that cover a range of 360 degrees of the system. These sensors are used in the feedback of the BenchBot, as an obstacle avoidance algorithm.
The bot currently is equipped with HCSRF04 ultrasonic sensors, that have a range from 2 cm to 300 cm. The sensor has a resolution of 0.3 cm and works on +5V DC. The data-sheet for the ultrasonic sensors can be found here.
A simple voltage divider circuit can be used to work with the ultrasonic sensors, the recommended resistor values are R1 = 1k Ω and R2 = 2k Ω .
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