Raspberry Pi 3 GPIO: pushbuttons, LEDs for RC and BARR | by R. X. Seger | Medium
![Understanding Raspberry Pi 3 - Internet of Things with Raspberry Pi 3 [Book]](https://www.oreilly.com/api/v2/epubs/9781788627405/files/assets/0bd47176-708f-4b87-801d-37d3e3165925.png "Understanding Raspberry Pi 3 - Internet of Things with Raspberry Pi 3 [Book]")
Understanding Raspberry Pi 3 - Internet of Things with Raspberry Pi 3 [Book]
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Raspberry Pi 3 Model B
