Chapter 21
Ten Great Add-Ons for the Raspberry Pi
IN THIS CHAPTER
Building an arcade machine
Making a robot
Setting your Raspberry Pi to turn on or off on schedule
Adding new inputs: a piano keyboard, temperature sensor, and gesture sensor
Adding new outputs: LEDs, LCDs, electronic paper, and a speaker
In addition to being able to connect your own electronics projects to the Raspberry Pi’s general-purpose input/output (GPIO) pins, you can use the pins to mount add-on boards. Extension boards that sit on top of the Pi boards are often called HATs (HAT is short for “hardware attached on top”). HATs comply with a standard and are sized to sit on a full-size Raspberry Pi without overhanging it. Add-ons that are the same size as the Pi Zero are often called pHATs, short for partial HATs. You can use HATs or pHATs with any Raspberry Pi computer.
If you’re using a Raspberry Pi 400, the GPIO pins are parallel to the desk, pointing away from you. On other devices, they point up to the ceiling. ...
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