As an effect of using a pull-up resistor with a pushbutton, we will read the following value when the pushbutton is pressed in the GPIO pin to which it is connected:
A low value (0V).
A high value, that is, the IOREF voltage.
A value between 1V and 3.3V.
As an effect of using a pull-up resistor with a pushbutton, we will read the following value when the pushbutton is released in the GPIO pin to which it is connected:
A low value (0V).
A high value, that is, the IOREF voltage.
A value between 1V and 3.3V.
If we check a pushbutton status by reading the GPIO pin value to which it is connected with polling, the loop runs every 0.5 seconds and the user keeps the pushbutton pressed for 3 seconds:
The code will behave as if the pushbutton was pressed more than once.
The code will behave as if the pushbutton was pressed just once.
The code will behave as if the pushbutton was never pressed.
We have an interrupt handler for a pushbutton with the interrupt edge mode set to
mraa.EDGE_FALLING...
Internet of Things with Python
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Internet of Things with Python
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Overview of this book
Internet of Things (IoT) is revolutionizing the way devices/things interact with each other. And when you have IoT with Python on your side, you'll be able to build interactive objects and design them.
This book lets you stay at the forefront of cutting-edge research on IoT. We'll open up the possibilities using tools that enable you to interact with the world, such as Intel Galileo Gen 2, sensors, and other hardware. You will learn how to read, write, and convert digital values to generate analog output by programming Pulse Width Modulation (PWM) in Python. You will get familiar with the complex communication system included in the board, so you can interact with any shield, actuator, or sensor.
Later on, you will not only see how to work with data received from the sensors, but also perform actions by sending them to a specific shield. You'll be able to connect your IoT device to the entire world, by integrating WiFi, Bluetooth, and Internet settings. With everything ready, you will see how to work in real time on your IoT device using the MQTT protocol in python.
By the end of the book, you will be able to develop IoT prototypes with Python, libraries, and tools.
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Internet of Things with Python
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Table of Contents (19 chapters)
Internet of Things with Python
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Free Chapter
Understanding and Setting up the Base IoT Hardware
Working with Python on Intel Galileo Gen 2
Interacting with Digital Outputs with Python
Working with a RESTful API and Pulse Width Modulation
Working with Digital Inputs, Polling and Interrupts
Working with Analog Inputs and Local Storage
Retrieving Data from the Real World with Sensors
Displaying Information and Performing Actions
Working with the Cloud
Analyzing Huge Amounts of Data with Cloud-based IoT Analytics
Exercise Answers
Index
Customer Reviews