hc

import RPi.GPIO as GPIO import time import threading GPIO.setmode(GPIO.BCM)

TRIG = 14
ECHO = 15

L = 24

TRIG_W = 23
ECHO_W = 18

distance1 = 0
distance2 = 0

a = 0
b = 0
c = 0

GPIO.setup(TRIG,GPIO.OUT)
GPIO.setup(ECHO,GPIO.IN)
GPIO.setup(TRIG_W,GPIO.OUT)
GPIO.setup(ECHO_W,GPIO.IN)
GPIO.setup(L,GPIO.OUT)

def ultrasonic1():
    try:
            GPIO.output(TRIG, False)
            time.sleep(1)

            GPIO.output(TRIG, True)
            time.sleep(0.00001)
            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

            global distance1
            distance1 = pulse_duration * 17150

            distance1 = round(distance1, 2)

            print "Distance1:",distance1,"cm"
            if distance1 < 20:
                global a
                a += 1
            time.sleep(0.2)
    except KeyboardInterrupt:
        print "KeyboardInterrupt detected!"
        GPIO.cleanup()
def ultrasonic2():
        try:
                        GPIO.output(TRIG_W, False)
                        time.sleep(1)

                        GPIO.output(TRIG_W, True)
                        time.sleep(0.00001)
                        GPIO.output(TRIG_W, False)

                        while GPIO.input(ECHO_W)==0:
                                pulse_start = time.time()

                        while GPIO.input(ECHO_W)==1:
                                pulse_end = time.time()

                        pulse_duration = pulse_end - pulse_start
                        global distance2
                        distance2 = pulse_duration * 17150

                        distance2 = round(distance2, 2)

                        print "Distance2:",distance2,"cm"
            if distance2 < 20:
                global b
                b += 1
                        time.sleep(0.2)
        except KeyboardInterrupt:
                print "KeyboardInterrupt detected!"
                GPIO.cleanup()

try:
    while True:
                e1 = threading.Event()
                e2 = threading.Event()
                t1 = threading.Thread(target=ultrasonic1)
                t2 = threading.Thread(target=ultrasonic2)
                t1.start()
                t2.start()
        if b > a:
            c = 1
        elif a > b:
            c = 0
        if c <= 0:
            print "a = ", a, "b = ", b
            print "c = ", c
            print "turn off"
                        GPIO.output(L,GPIO.LOW)
        elif c >= 1:
            print "a = ", a, "b = ", b
                        print "c = ", c
                        print "turn on"
                        GPIO.output(L,GPIO.HIGH)
                time.sleep(0.5)
except KeyboardInterrupt:
        print "KeyboardInterrupt detected!"
    t1.join()
        t2.join()
        GPIO.cleanup()