Arbaz Hussain
Published

Distance Calculation with Ultrasonic Sensor

Ultrasonic distance sensors are designed to measure distance between the source and target using ultrasonic waves.

EasyFull instructions provided1 hour11,953
Distance Calculation with Ultrasonic Sensor

Things used in this project

Hardware components

Raspberry Pi 3 Model B
Raspberry Pi 3 Model B
×1
Resistor 330 ohm
Resistor 330 ohm
×1
Resistor 475 ohm
Resistor 475 ohm
×1
Breadboard (generic)
Breadboard (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Ultrasonic Sensor - HC-SR04 (Generic)
Ultrasonic Sensor - HC-SR04 (Generic)
×1

Story

Read more

Schematics

Connection Diagram

Interfacing raspberry pi with hc sr04 circuit diagram 600x361 napzhquagj

Code

dist-sensor.py

Python
import RPi.GPIO as GPIO                    #Import GPIO library
import time                                #Import time library
GPIO.setmode(GPIO.BCM)                     #Set GPIO pin numbering 

TRIG = 23                                  #Associate pin 23 to TRIG
ECHO = 24                                  #Associate pin 24 to ECHO

print "Distance measurement in progress"

GPIO.setup(TRIG,GPIO.OUT)                  #Set pin as GPIO out
GPIO.setup(ECHO,GPIO.IN)                   #Set pin as GPIO in

while True:

  GPIO.output(TRIG, False)                 #Set TRIG as LOW
  print "Waitng For Sensor To Settle"
  time.sleep(2)                            #Delay of 2 seconds

  GPIO.output(TRIG, True)                  #Set TRIG as HIGH
  time.sleep(0.00001)                      #Delay of 0.00001 seconds
  GPIO.output(TRIG, False)                 #Set TRIG as LOW

  while GPIO.input(ECHO)==0:               #Check whether the ECHO is LOW
    pulse_start = time.time()              #Saves the last known time of LOW pulse

  while GPIO.input(ECHO)==1:               #Check whether the ECHO is HIGH
    pulse_end = time.time()                #Saves the last known time of HIGH pulse 

  pulse_duration = pulse_end - pulse_start #Get pulse duration to a variable

  distance = pulse_duration * 17150        #Multiply pulse duration by 17150 to get distance
  distance = round(distance, 2)            #Round to two decimal points

  if distance > 2 and distance < 400:      #Check whether the distance is within range
    print "Distance:",distance - 0.5,"cm"  #Print distance with 0.5 cm calibration
  else:
    print "Out Of Range"                   #display out of range

Credits

Arbaz Hussain

Arbaz Hussain

0 projects • 8 followers
cat /etc/arbaz | grep Machine Learning && Bug Hunter
Contact

Comments