Keyestudio 4WD Manual page 289

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According to the above wiring diagram, the integrated port of the
ultrasonic sensor module is connected to the 5V G P15 P16 port on the
micro:bit motor drive backplane. The Trig (T) pin is controlled by P15 of the
micro:bit and the pin of Echo (E) the P16.
(2)Working Principle:
Pull down TRIG then trigger high level signals with least 10us
After triggering, the module will automatically send eight 40KHz ultrasonic
pulses and detect whether there is a signal return.
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