Published July 19, 2018

Distance Measurement Using Python & Tk GUI Tools

This project uses an ultrasonic sensor to indicate the distance of any object from it.

BeginnerFull instructions provided1 hour4,698

Distance Measurement Using Python & Tk GUI Tools

Things used in this project

Hardware components

Ultrasonic Sensor - HC-SR04 (Generic)

Raspberry Pi 3 Model B

Resistor 10k ohm

Resistor 4.75k ohm

DIYables Enclosure for Raspberry Pi

DIYables 7-Inch Touch Screen Display for Raspberry Pi - HDMI Interface

DIYables Base Plate Breadboard for Raspberry Pi Prototying

DIYables Jumper Wires

DIYables Starter Kit

DIYables Screw Terminal Block Shield for Raspberry Pi

Story

Ultrasonic ranging module HC-SR04 provides 2cm to 400cm non-contact distance measurement range. Its accuracy can reach ±3mm with a cycle period of 50ms, which is the minimum time delay recommended before measurements are taken. The module includes ultrasonic transmitter, receiver and control circuit. This project uses an ultrasonic ranging module with a Raspberry Pi to build an ultrasonic distance meter GUI.

Note:

The project can be developed by adding a button with a new function such as start function to repeat the measurment process:

Schematics

Code

The code 2 with start and stop button

from Tkinter import *
import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BOARD)
GPIO.setwarnings(False)
TRIG=11
ECHO=15
GPIO.setup(TRIG,GPIO.OUT)
GPIO.setup(ECHO,GPIO.IN,pull_up_down=GPIO.PUD_DOWN)
root=Tk()
def start():
  global distance,pulse_end, p
  TRIG=11
  ECHO=15
  GPIO.output(TRIG,False)
  print("delay")
  time.sleep(2)
  GPIO.output(TRIG,True)
  time.sleep(0.00001)
  GPIO.output(TRIG,False)
  while GPIO.input(ECHO)==0:
    p=0
    p=time.time()
  while GPIO.input(ECHO)==1:
   pulse_end=0
   pulse_end=time.time()
   d =pulse_end - p
   distance=d*17150
  #distance=round(distance,2)
  print("Distance:",distance,"cm")
  lable= Label (root,width=36,fg="yellow",bg="purple")
  lable.config(font=("Courier",36))
  lable.config(text=distance)
  lable.pack()
button=Button(root,text='Stop',bg ='cyan',width=50,command=root.destroy)
button.pack()
button2=Button(root,text='Sart', bg ='gold',width=50,command=start)
button2.pack()
root.mainloop()
GPIO.cleanup()