raspberry gpio tutorial 5...control LED using ultrasonic in tamil

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python codings

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

led = 17
echo = 4
trig = 18

GPIO.setup(echo , GPIO.IN)
GPIO.setup(led , GPIO.OUT)
GPIO.setup(trig , GPIO.OUT)

while 1:
    GPIO.output(trig ,True)
    time.sleep(0.00001)
    GPIO.output(trig ,False)
    while GPIO.input(echo) == False:
        srt = time.time()
    while GPIO.input(echo) == True:
        end  = time.time()

    duration = end - srt

    distance_cm = duration/0.000058
    print distance_cm
    if distance_cm < 10:
        GPIO.output(led , GPIO.HIGH)
    else :
        GPIO.output(led , GPIO.LOW)
    time.sleep(.1)
************************************************************
copy that and upload in your python idle

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