Published April 22, 2020 © GPL3+

Water Level Monitor with Raspberry pi

Always forget to turn the tap off for a bucket and it overflows? This project will help you

BeginnerFull instructions provided1 hour38,742

Things used in this project

Hardware components

Raspberry Pi 3 Model B

Raspberry Pi 3b

Ultrasonic Sensor - HC-SR04 (Generic)

Ultrasonic Sensor

Buzzer

Jumper wires (generic)

Jumper Wires

Story

Introduction

My name is Shafin, and I am a member of Aiversity. I will demonstrate how to build a water level sensor using a Raspberry Pi. This project is meant to help you to understand the workings of the Raspberry Pi in detail. See below for the video project.

For the full project, visit http://aiversity.com/water-level-monitor-using-raspberry-pi/

Or, the written project is below

Extra Materials:

A Jug Of Water
A Small Bucket

Connections

Let's talk about how the raspberry pi, ultrasonic sensor, and buzzer are connected.

Here is a circuit diagram for your reference:

Written Connections:

Ultrasonic sensor VCC to 5v of Raspberry Pi
Ultrasonic sensor GND to GND of Raspberry Pi
Trigger to GPIO 2
Echo to GPIO 3
Buzzer + to GPIO 4
Buzzer – to GND

Structure

Attach a scale to the bucket.
Next, attach the buzzer and ultrasonic sensor to the scale
Measure and note the distance between the ultrasonic sensor and the bottom of the bucket (you will need this information in the code)

Code

Now you know the connections and the structure, let’s build the code.

1. Open the Thonny Python IDE

2. Download the Github code from below:

-- https://github.com/Aiversity/Raspberry-Pi-projects-for-beginners/tree/master/Water%20Level%20Monitor%20Without%20Oled%20Display

3. Run the code.

Testing

Prepare the bucket by filling it with water. A buzzer will beep when the ultrasonic sensor is 4 centimeters from the water, indicating the bucket is almost full.

If you have any queries, please ask at shafinkothia@gmail.com or hello.aiversity@gmail.com

Or type in the comments

To know more, visit http://www.aiversity.com

Code

Ultrasonic Sensor Water Level

import RPi.GPIO as GPIO
import time


GPIO.setmode(GPIO.BCM)

TRIG = 2
ECHO = 3
i=0

GPIO.setup(TRIG ,GPIO.OUT)
GPIO.setup(ECHO,GPIO.IN)
GPIO.setup(4 ,GPIO.OUT)

GPIO.output(TRIG, False)
print("Starting.....")
time.sleep(2)

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_stop = time.time()

   pulse_time = pulse_stop - pulse_start

   distance = pulse_time * 17150
   print(round(distance, 2));

   time.sleep(1)
   
   if distance < 4:
       print("Water will overflow")
       GPIO.output(4, True);
       time.sleep(0.5)
       GPIO.output(4, False);
       time.sleep(0.5)
       GPIO.output(4, True);
       time.sleep(0.5)
       GPIO.output(4, False);
       time.sleep(0.5)
   else:
       GPIO.output(4, False);