Quote:
Originally Posted by BitTwiddler
To be honest, we use them to sense the presence of an object on the robot. We just look for a certain threshold voltage to sense this. While they can be used to measure distances the response curve is non-linear so some kind of table look-up function might be needed to convert a measured voltage to the distance measured.
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I'm not sure which ultrasonic sensor you have observed this with, but we have used multiple maxBotix ultrasonic sensors over the past two years and they have all had extremely linear responses over their recommended ranges.