Keyestudio Smart Little Turtle Robot V3 Manual page 95

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1. Use method and timing chart of ultrasonic module:
Setting the delay time of Trig pin of SR04 to 10μs at least, which can trigger
it to detect distance.
2. After triggering, the module will automatically send eight 40KHz
ultrasonic pulses and detect whether there is a signal return. This step will
be completed automatically by the module.
3. If the signal returns, the Echo pin will output a high level, and the
duration of the high level is the time from the transmission of the
ultrasonic wave to the return.
Trigger signals
10us high level
Send ultrasonic waves
Send 8t 40KHz ultrasonic pulses
Module gets the time gap of
Test result
transmission and reception
Circuit diagram of ultrasonic sensor:
95