The Pinouts Book helps you understand components and boards

The Pinouts Book is a free PDF download contains over 300 pages of high-contrast hardware diagrams and their respective pinouts.

The Pinouts Book is a free digital book created for designers and engineers as a quick reference for remembering the different pinout functions in your electronics projects.

The book covers 130 commonly used components (view list), such as connectors, single board computers, dev boards, memory cards, microcontroller chips, and more (includes 11 Adafruit boards, but we’re not involved in this).

If you need more technical information, each page has a link at the top (e.g. pinouts.org/XXX), and these redirect to official datasheets / specifications.

See the video of this work of art from NODE and Baptiste and the book is at pinouts.org. More information this blog post at and Hackaday.

The project will always be free but they have some merch to help support things.


As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email circuitpython2022@adafruit.com to let us know about your post so we can blog it up here.

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CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


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1 Comment

  1. I think it would be a good idea to have a version that does not use black backgrounds for the line drawings, if you try to print it on an inkjet, which is the most common printers that people have, you will burn through a lot of ink and end up with a pike of very soggy pages.

    Just provide an inkjet version that has the drawings all reversed, black for white.

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