Updated: Jan 15
This is a video tutorial about how to interface raspberry Pi with ultrasonic sensor. Ultrasonic sensor is used for distance measurement and gives fairly accurate readings as its using ultrasonic sound to find the distance. This is a detailed tutorial including all the explanation about interfacing of sensor, its working, and the algorithm of python program.
The python program is also explained in detail in the video.
To interface raspberry pi with ultrasonic sensor and create a distance meter, you’ll need
Raspberry Pi any version
Ultrasonic sensor HC-SR04
Circuit Diagram of Ultrasonic sensor with Raspberry Pi
The interfacing diagram is as shown below
Raspberry pi ultrasonic sensor interfacing circuit
Python Code for Ultrasonic Sensor Interfacing with Raspberry Pi
import RPi.GPIO as GPIO import time TRIG=21 ECHO=20 GPIO.setmode(GPIO.BCM) while True: print"distance measurement in progress" GPIO.setup(TRIG,GPIO.OUT) GPIO.setup(ECHO,GPIO.IN) GPIO.output(TRIG,False) print"waiting for sensor to settle" time.sleep(0.2) 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,2) print"distance:",distance,"cm" time.sleep(2)
Above code is created in Python 3, however if you’re using python 2 the code will still work for you.
Complete Video tutorial
This is the detailed tutorial of Ultrasonic Sensor Interfacing with Raspberry Pi