touchsensor.py

import RPi.GPIO as GPIO
import time
import os

#sensor pin define
buzzer = 14
touch = 26
relay_in1 = 13
relay_in2 = 19

#GPIO port init
def init():
         GPIO.setwarnings(False)
         GPIO.setmode(GPIO.BCM)
         GPIO.setup(buzzer,GPIO.OUT)
         GPIO.setup(relay_in1,GPIO.OUT)
         GPIO.setup(relay_in2,GPIO.OUT)
         GPIO.setup(touch,GPIO.IN,pull_up_down=GPIO.PUD_UP)
         pass

#turn on buzzer
def buzzer_on():
         GPIO.output(buzzer,GPIO.LOW)
         time.sleep(0.2)
         GPIO.output(buzzer,GPIO.HIGH)
         time.sleep(0.2)
         pass
#turn off buzzer
def buzzer_off():
         GPIO.output(buzzer,GPIO.HIGH)
         pass

#turn on relay
def relay_on():
         #open relay channal1 ana channal2
         GPIO.output(relay_in1,GPIO.LOW)
         GPIO.output(relay_in2,GPIO.LOW)

#turn off relay
def relay_off():
                  GPIO.output(relay_in1,GPIO.HIGH)
                  GPIO.output(relay_in2,GPIO.HIGH)


touchstatus = False
#read digital touch sensor
def read_touchsensor():
         global touchstatus
         if (GPIO.input(touch)==True):
                  touchstatus = not touchstatus
                  if touchstatus:
                           print"Turn on relay"
			   print"\n"
                           buzzer_on()
                           relay_on()
                  
                  else:
                           print"Turn off relay"
			   print"\n"
                           buzzer_on()
                           relay_off()
         pass
                  

#main loop
def main():
         print"...................................................................System initializing..."
         init()
         buzzer_off()
         relay_off()
         print"...................................................................Ok"
         print"...................................................................Please touch"
         print"\n"
         while True:
                  read_touchsensor()

if __name__ == '__main__':
         try:
                  main()
                  pass
         except KeyboardInterrupt:
                  pass
         pass
GPIO.cleanup()