FreshHands.py

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)


TRIG = 20  #When we say TRIG, we mean 23. Makes the code easier to understand.
ECHO = 26   #When we say ECHO, we mean 24. Makes the code easier to understand.

print ("Distance Measurement In Progress")

GPIO.setup(TRIG,GPIO.OUT)    #sets up TRIG (that's PIN 23) to an outout for the speaker to trigger sending a PING!
GPIO.setup(ECHO,GPIO.IN)     #sets up ECHO (that's PIN 23) to an input microphone to listen for the echo PONG back.

GPIO.output(TRIG, False)     #Makes sure the Trigger speaker isn't sending out anything and is quiet to start.
print ("Waiting For Sensor To Settle")
time.sleep(2)


def distcheck():  #defines a neat function to gather up all the code needed for one single distance measurement.
  GPIO.setmode(GPIO.BCM)
  GPIO.output(TRIG, True)  #fires a pulse by setting the trigger speaker to high
  time.sleep(0.00001)      #wait's a fraction of a second, it's a very short pulse!!!!
  GPIO.output(TRIG, False) #turns the trigger speaker off again.

  while GPIO.input(ECHO)==0:    #measure some times
    pulse_start = time.time()   #records the time the pulse was sent

  while GPIO.input(ECHO)==1:    #records the time the echo was heard
    pulse_end = time.time()

  pulse_duration = pulse_end - pulse_start  #finds the differnce between sent and recieved pulses

  distance = pulse_duration * 17150         #multiply by a fudge factor to convert to seconds

  distance = round(distance, 2)             #rounds off the number

  #print ("Distance:",distance,"cm")         #prints it
  return distance


######## Takes 5 reading from sensor and writes them to a .csv #########
print(distcheck())
    from gpiozero import Buzzer
    import time
    buzzer = Buzzer(17)
    buzzer.on()
    time.sleep(1)
    buzzer.off()



GPIO.cleanup(