Water Leak Detection Notifications

Water Leak Detection Project with GrovePi  and Hologram Nova

This project uses the Grove water sensor that can detect water leaks, spills, floods, and rain. It also can send notifications using cellular network.

Things used in this project:

Hardware components:

• Raspberry Pi Zero W or WH
• GrovePi Zero 
• Grove Water Sensor
• Grove LCD RGB Backlight
• Hologram SIM

Software Apps:

• GrovePi 
• Python
• Hologram CLI

Water sensor module from Grove system provides  the ability to detect if there is any water leak by measuring conductivity. The water sensor traces have a weak pull-up resistor of 1 MΩ and it pulls the sensor trace value high until a drop of water shorts the sensor trace to the grounded trace.

GrovePi Zero is a HAT from Dexter Industries  that allows Grove Water sensor to connect to Raspberry Pi zero with out needing soldering or breadboards. One can plug in the Grove water sensor start programming.

Grove water sensor works with digital I/O pins and it can be connected to D3 port Grove Pi Zero as shown below.
The installation instructions for Grove Pi zero and Hologram SIM are provided here .

The following program (water_sensor_led.py) checks the water sensor output sets the text on LCD.

First  a cellular connection is established using the credentials that uses a devicekey obtained from Hologram dashboard.

#!/usr/bin/env python

import time
import grovepi
from grove_rgb_lcd import *
from Hologram.HologramCloud import HologramCloud


# Establish a cellular connection
credentials = {'devicekey': 'xxxxxxxx'}
hologram = HologramCloud(credentials, network='cellular')

# Connect Water Sensor to Digital Port D3
water_sensor = 3

setRGB(0,255,0)

grovepi.pinMode(water_sensor,"INPUT")

while True:
    try:
        if (grovepi.digitalRead(water_sensor) == 0):

          response_code = hologram.sendMessage("Water Detected")
          setText_norefresh("Water Detected")
        else:
          setText_norefresh("No Water Found")

        time.sleep(10)

    except IOError:
        print ("Error Connecting Grove Components")

After execution of the above program, the status is displayed on the LCD.

 $ sudo python water_sensor_led.py

After reading the digital input from port D3 it determines if water is detected and displays the message on the LCD and it also sends notification using cellular network if there is a water leak.

Configure routes in Hologram dash board to send the notifications (e.g., SMS, email etc).