Q. Please explain what mutual interference is, and how I can prevent this from occurring.


Mutual interference occurs when ultrasonic sensors are mounted in close proximity to each other and the target is in a position to reflect echoes back to a sensor near the transmitting sensor. To reduce the chance of this occurring, mount adjacent sensors as far apart as possible, and test the sensors with the target object placed in the sensing range of one of the sensors. If any of the other sensors detect the echo from the originating sensor and target object, then re-position the sensors, either through spacing them further apart, or angling the sensors away from each other.