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Internet of Things Programming with JavaScript

You're reading from   Internet of Things Programming with JavaScript Get the best out of Arduino and Raspberry Pi Zero to develop Internet of Things projects using JavaScript

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Product type Paperback
Published in Feb 2017
Publisher Packt
ISBN-13 9781785888564
Length 298 pages
Edition 1st Edition
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Author (1):
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Ruben Oliva Ramos Ruben Oliva Ramos
Author Profile Icon Ruben Oliva Ramos
Ruben Oliva Ramos
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Table of Contents (10) Chapters Close

Preface 1. Getting Started with Raspberry Pi Zero 2. Connecting Things to the Raspberry Pi Zero FREE CHAPTER 3. Connecting Sensors - Measure the Real Things 4. Control-Connected Devices 5. Adding a Webcam to Monitor Your Security System 6. Building a Web Monitor and Controlling Devices from a Dashboard 7. Building a Spy Police with the Internet of Things Dashboard 8. Monitoring and Controlling Your Devices from a Smart Phone 9. Putting It All Together

Measuring flow sensor to calculate the volume of water


We need to take automatic measurements from the water that we're using in the home. For this project, we will use a sensor to perform this reading and make the reading of measurement automatic.

To make this project, we need the following materials:

Flow Water Sensor and Arduino UNO board:

Hardware connections

Now we have the connections for out flow sensor. We can see that it has three pins -- the red pin is connected to +VCC 5 volts, the black one is connected to GND, and the yellow pin is connected to pin number 2 of the Arduino board as seen in the following image:

Reading the sensor signal

An interrupt is used for the pulses generated by the passage of water to be accounted as follows:

attachInterrupt(0, count_pulse, RISING); 

The interruption is of type RISING counts the pulses that pass from a low state to a high:

Function for counting pulses: 
 
voidcount_pulse() 
{ 
pulse++; 
} 
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