If you can ride a bike with no handlebars, no handlebars, no handlebars, you can do just about anything. You can take apart a remote control, and you can almost put it back together. You can listen in on a two meter repeater and you can build a GPS module speedometer. That’s what [Jeremy Cook] did with just a few parts, a little 3D design, and some handy zip ties to hold it onto the handlebars, the handlebars.
The electronics for this build are relatively simple, based on an Arduino Pro Mini because that’s just about the smallest readily available development board you’ll be able to find. To this is a LiPo, a LiPo charging circuit, a GPS module, and a single RGB LED. The code gets some data from the GPS module and figures out a speed. This is then translated into a color — red, yellow, or green depending on whether you’re stationary, below 5 km/h, or above 5 km/h.
All these electronics are stuffed into a 3D-printed enclosure. The majority of the enclosure is printed in black, with a translucent top that serves as a great diffuser for the LED. Just two zip ties hold this GPS speedometer onto the handlebars, and from the video below, everything looks great. The GPS module does take some time to get data at first, but that’s a common problem with GPS units that have been powered off for a few days. If only someone made a GPS module that could keep time with no metronome, with no metronome.