Re: Max. US sensor range?
The US sensor calculates the distance on the measured travel time of the sonic pulse from the sensor to the remote object and backwards. However, it requires a certain level of the reflected signal.
If the remote object reflects too little amount (because of its small size or absorbing surface) the US sensor will not detect reflected signal and will respond "255."
When I try to measure the distance of our ceiling (flat, plain and hard surface) the US sensor is quite good even if it is 240 cm from the ceiling. However, measuring the distance of the sofa is not that straightforward, the US sensor can detect the signal up to 1.5 m. The thin and round leg of the chair is detected only from 1 m.