mmabey / circuitpython_hcsr04 Goto Github PK

 def __init__(self, trig_pin, echo_pin,timeout=2):
  ...
        self.timeout=timeout
 ...
def _dist_two_wire(self):
        self.echo.clear()  # Discard any previous pulse values
        self.trig.value = 1  # Set trig high
        time.sleep(0.00001)  # 10 micro seconds 10/1000/1000
        self.trig.value = 0  # Set trig low
        timeout=time.monotonic()
        self.echo.resume()
        while len(self.echo) == 0:
            # Wait for a pulse
            if(time.monotonic()-timeout)>self.timeout:
                self.echo.pause()
                return -1
        self.echo.pause()
        if self.echo[0] == 65535:
            return -1