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def get_distance(): Trig.value(1) time.sleep_us(10) Trig.value(0) timeout_start = time.ticks_ms() while not Echo.value(): if time.ticks_diff(time.ticks_ms(), timeout_start) > 100: # 100 ms timeout return -1 # Return -1 if no response ping_start = time.ticks_us() while Echo.value(): if time.ticks_diff(time.ticks_ms(), timeout_start) > 100: # 100 ms timeout return -1 # Return -1 if no response ping_stop = time.ticks_us() distance_time = time.ticks_diff(ping_stop, ping_start) // 2 return int(sound_velocity * distance_time // 10000) # Convert to cm
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