The GPIO Pinout map is different depending on which model of Raspberry Pi you are using. This book assumes you have the Pi 4 Model B+ and will reference these GPIO pin locations accordingly. Here’s a useful tip from one of this book’s technical reviewers and fellow Pragmatic Bookshelf author Maik Schmidt: if you’re running Raspberry Pi OS, you can type in pinout in the Terminal window, and a graphical map and list of all the pinouts for the model of the Pi that you have will be displayed onscreen. Very cool!
Attach one of the water sensor’s white wires to pin 39, which is associated with ground ...
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