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Home / Welcome to four-forty! / Tutorials

Tutorials

Product tutorials

12S battery monitoring system (coming soon)

Ratiometric inline current sensor

Technology tutorials

Battery monitoring basics (coming soon)

Want to build smarter tech?

So do we.

four-forty strives to provide accessible electronics that help you build awesome things. We design the kind of products that we want to use. That means affordable, robust, and completely open-source.

Every product includes specs, schematics, CAD files, and resources to get you started as fast as possible. Happy building!

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