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    HC-SR04 – Sonar Sensor Code (Raspberry Pi)

    29th November 2014

    Raspberry-Pi

    Raspberrypi - Codehaven

    Measures distance continuously every .5 of a second
    Uses : ce0 = pin24 = gpio 8 (This has a resistor inline)
    ce1 = pin 26 = gpio7

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    import RPi.GPIO as GPIO
    import time
    GPIO.setmode(GPIO.BCM)
    TRIG = 7
    ECHO = 8
    print "Distance Measurement In Progress"
    GPIO.setup(TRIG,GPIO.OUT)
    GPIO.setup(ECHO,GPIO.IN)
    GPIO.output(TRIG, False)
    print "Waiting For Sensor To Settle"
     
    def measure():
    time.sleep(0.5)
    GPIO.output(TRIG, True)
    time.sleep(0.1)
    GPIO.output(TRIG, False)
    while GPIO.input(ECHO)==0:
      pulse_start = time.time()
    while GPIO.input(ECHO)==1:
      pulse_end = time.time()
    pulse_duration = pulse_end - pulse_start
    distance = pulse_duration * 17150
    distance = round(distance, 2)
    print "Distance:",distance,"cm"
     
    loop = 1
    while loop == 1:
    print measure()
     
     
    GPIO.cleanup()
     

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