An Arduino Nano is the heart of the build, paired with a shield that lets it run a number of servo motors. The servos, one per key, are each assembled into a 3D-printed bracket with a cam-driven ...

[JanHerman] knows that tuning musical instruments is all about precision and that precision is measured in a logarithmic unit called a cent. A cheap tuner unit might be accurate to 1.5 cents which … ...

Why wait for a company to manufacture the tech you need when you can build it yourself? These nine Raspberry Pi and Arduino courses show you how for $69.99, $353 off the $423 MSRP.