Category Archives: Arduino

Bearing Raceway Speedometer

Posted on 2021-04-30 by M. Eric Carr

A TTGO board, 3D printed enclosure, and some optoelectronics are turned into a speedometer for steel bearing balls. Continue reading →

Posted in 3D Printing, Arduino, C, Coding, Digital | Leave a comment

TTGO T-Display I2C pin location

Posted on 2021-02-21 by M. Eric Carr

I2C is broken on the TTGO T-Display. Fortunately, there’s an easy fix. Continue reading →

Posted in Arduino, C, Coding, Digital, Troubleshooting | Leave a comment

Printing Large Numbers on Arduinos

Posted on 2020-08-11 by M. Eric Carr

How to print unsigned 64-bit integers simply in Arduino C, using decimal long division. Continue reading →

Posted in Arduino, C, Coding, HOW-TO, Math | Tagged 64 bit, Arduino, Arduino C, C, long integers, long long, print long long, printing long long, uint64_t, unsigned long long | Leave a comment

DIY scroll wheel

Posted on 2020-07-31 by M. Eric Carr

An Arduino Leonardo can be used to add scroll wheel functionality if your mouse doesn’t have it. Here’s how. Continue reading →

Posted in Arduino, C, Coding, Digital, HOW-TO, User Interface Design | Tagged 3d printing, Arduino, Arduino Leonardo, hid, Leonardo, mouse, quadrature, quadrature encoder, scroll, scroll wheel, trackman, usb, usb hid | Leave a comment

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