Published August 16, 2015

Water Quality App

We want to monitor the quality of tap water coming into a house, maintain its supply and save water all through the use of a simple App.

ExpertWork in progress3,524

Things used in this project

Hardware components

Android device

Raspberry Pi 2 Model B

Libelium Smart Water wireless sensor

Solenoid Valve

Software apps and online services

muzzley

Story

The Problem

Water is an issue where we live, in Karachi, Pakistan. Due to widespread water shortages every house or building has their own water storage system which they fill periodically and use in-between water flowing from the city lines.

Though supply is a major issue, it's not the only one.

Karachi, like many up-and-coming cities in the 3rd world countries has limited water infrastructure much of which is cheaply built and poorly maintained. As a result pipes often are broken and there are major issues of seepage of contaminants into the water supply. Due to constant repairs of the systems, blockages and flooding in the sewage systems (that use the same underground channels as the water pipes), and variances in the quality of the source water being pumped from wells across the city, we've learned to be highly skeptical of our water quality.

Our Goal

Our project aims to guarantee that people know what kind of water they are getting so they can make sure that when they fill their water tank (over a weeks worth of water) they are doing so with clean water. Our hope is to bring awareness to the quality of the water we use everyday and free us all of the worry associated with what we may be washing our face or brushing our teeth in.

The Solution

Our device puts together a Smart Water sensor with a valve system to allow users to both open the vale fill their tanks remotely and check the quality of the water currently coming in. This way they can keep contaminated water from entering their water tanks.

The Parts

Libelium Water sensor:

The Libelium water sensor in the device we are developing tracks key water quality measures such as: pH, dissolved oxygen (DO), oxidation-reduction potential (ORP), conductivity (salinity), turbidity, temperature and dissolved ions (F-, Ca2+, NO3-, Cl-, Pb2+, I-, Cu2+, Br-, Ag+/S2-, BF4-). These measures can be used to give real-time feedback on the water that is currently coming from the city.

Libelium water testing sensor

Solenoid Valve:

The valve that allows us to turn the water on or off.

Raspberry Pi Board:

To communicate with our App, sensing mechanism, and valve.

Code

Starter Code

buttonPin = gpio.OpenPin(BUTTON_PIN);
ledPin = gpio.OpenPin(LED_PIN);
// Initialize LED to the OFF state by first writing a HIGH value
// We write HIGH because the LED is wired in a active LOW configuration
ledPin.Write(GpioPinValue.High); 
ledPin.SetDriveMode(GpioPinDriveMode.Output);

// Check if input pull-up resistors are supported
if (buttonPin.IsDriveModeSupported(GpioPinDriveMode.InputPullUp))
	buttonPin.SetDriveMode(GpioPinDriveMode.InputPullUp);
else
	buttonPin.SetDriveMode(GpioPinDriveMode.Input);

// Set a debounce timeout to filter out switch bounce noise from a button press
buttonPin.DebounceTimeout = TimeSpan.FromMilliseconds(50);

// Register for the ValueChanged event so our buttonPin_ValueChanged 
// function is called when the button is pressed
buttonPin.ValueChanged += buttonPin_ValueChanged;

private void buttonPin_ValueChanged(GpioPin sender, GpioPinValueChangedEventArgs e)
{
	// toggle the state of the LED every time the button is pressed
	if (e.Edge == GpioPinEdge.FallingEdge)
	{
		ledPinValue = (ledPinValue == GpioPinValue.Low) ?
			GpioPinValue.High : GpioPinValue.Low;
		ledPin.Write(ledPinValue);
	}


// need to invoke UI updates on the UI thread because this event
// handler gets invoked on a separate thread.
var task = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => {
	if (e.Edge == GpioPinEdge.FallingEdge)
	{
		ledEllipse.Fill = (ledPinValue == GpioPinValue.Low) ? 
			redBrush : grayBrush;
		GpioStatus.Text = "Button Pressed";
	}
	else
	{
		GpioStatus.Text = "Button Released";
	}
});

Credits

Ahad khan

1 project • 4 followers

Thanks to Andy Larkin .

Water Quality App

Things used in this project

Hardware components

Software apps and online services

Story

The Problem

Our Goal

The Solution

The Parts

Schematics

Starter Schematic

Code

Starter Code

Credits

Ahad khan

Comments

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Water Quality App

Water Quality App

Things used in this project

Hardware components

Software apps and online services

Story

The Problem

Our Goal

The Solution

The Parts

Schematics

Starter Schematic

Code

Starter Code

Credits

Ahad khan

Comments

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