Chapter 3
Sensing the World
IN THIS CHAPTER
Discovering how to use I2C sensors
Sensing your environment with a Raspberry Pi
Collecting and saving data
Connecting Python to your smartphone
Sensors for the Raspberry Pi and other small computers number in the thousands. From detecting people in front of your computer with a passive infrared (PIR) sensor to detecting a myriad of environmental conditions (temperature, humidity, air quality, and so on), your computer can monitor the physical world in many inexpensive ways. In this chapter, you discover how to program your computer to communicate with these sensors.
To download the code for this chapter, go to www.dummies.com/go/pythonaiofd3e, scroll down to the Downloads link, and click the link for the Book 6 code.
Understanding I2C
For a computer to talk to sensors, it needs an interface. An interface consists of a hardware interface, which contains pins, types, and voltage levels, and a software interface, which is usually called a driver or an application programming interface (API). In this book, the software interface is a Python ...
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