An Arduino Mega 2560 clone is used to control four TB6600 stepper motor drivers, with a common OLED display module installed where the original display went. The keypad next to the screen has been ...

And honestly, a cheaper hobby to get into. With small Arduino boards becoming more popular, Olympia Circuits is jumping into the mix with the Arno Shield.

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Makers looking for a more substantial portable battery pack that they can make themselves should check out this this DIY power bank ...

The system consists of a hall effect sensor at the pedals to measure cadence, an Arduino controller, and a servo mechanism to replace the manual shifter. Everything is mounted in a small enclosure ...