Interfacing Ultrasonic sensor with raspberry pi

Hey,

In today's blog we are Interfacing Ultrasonic sensor with raspberry pi.

WHAT YOU NEED:

Raspberry pi 3

Ultrasonic sensor HC- SR04

680 ohm resistor (1/4 watt)

1.5 k ohm resistor (1/4 watt)

Connecting wire

Mini breadboard

Power supply

CIRCUIT DESIGN :

CODE :

import RPi.GPIO as GPIO

import time

GPIO.setmode(GPIO.BOARD)

TRIG = 16

ECHO = 18

i=0

GPIO.setup(TRIG,GPIO.OUT)

GPIO.setup(ECHO,GPIO.IN)

GPIO.output(TRIG, False)

print "Calibrating....."

time.sleep(2)

print "Place the object......"

try:

while True:

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

       distance = pulse_duration * 17150

       distance = round(distance+1.15, 2)
  
       if distance<=20 and distance>=5:
          print "distance:",distance,"cm"
          i=1
          
       if distance>20 and i==1:
          print "place the object...."
          i=0
       time.sleep(2)

except KeyboardInterrupt:
     GPIO.cleanup()

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