4.0 Ultrasound
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Now another interrupt, which is so helpful because it saves time.
If we want a robot to move quickly, we need to be able to react quickly to changing sensor values. With reflex couplers (line sensors), it takes a few to 100 microseconds to record a new value, depending on which phototransistor is used. (And, of course, whether you have to wait for the value to be recorded).
With ultrasound, it can take up to 40ms for a new value to be generated. At a speed of the robot of one meter per second, it covers... How many mm in this time? Exactly! And then your robot has missed the curve!