Battery-less Bike Computer Gets Power and Data from the Wheels


Bicycle generator era has complicated some distance past the bottle dynamos of years previous, which as steadily as no longer would introduce sufficient drag when engaged to stall the motorcycle. Granted, it’s no longer as a lot of a present draw as a large previous incandescent headlight, however this wheel-powered cyclocomputer is a smart instance of harvesting each energy and knowledge from the rotation of a motorbike’s wheel.(*(*12*)*)

Whilst there are many cyclocomputers to be had commercially, [Lukas] used to be on the lookout for some explicit options. His primary function used to be one thing usable at night time, which means that a backlit show, ruling out the generally coin-cell energy resources. His motorcycle’s hub dynamo introduced attention-grabbing probabilities — no longer handiest does it supply AC energy, however its output frequency is proportional to the motorcycle’s pace. This permits him to derive pace, distance, RPM, time-in-motion, and different parameters to show at the 1×(*12*) persona LCD show. There’s some artful circuitry had to situation the output of the hub dynamo, and a 1.5 farad supercapacitor helps to keep the unit powered for approximately four days when the motorcycle isn’t in movement.(*(*12*)*)

As for measuring the frequency of the dynamo’s output, [Lukas] merely used a virtual enter at the MSP430 microcontroller, with a little bit sign conditioning after all. He additionally added a barometer chip for altitude information, plus an ambient mild sensor to regulate the LCD backlight. The entirety lives in a artful Three-D-printed case with a minimalist however considerate design that docks and undocks from the motorcycle simply; [Lukas] assures us {that a} water-resistant model of the case is within the works.(*(*12*)*)

We in point of fact respect the class of this design, and how it makes use of the knowledge that’s embedded within the energy provide. Whilst [Lukas] seems to have used a commercially to be had generator, we’ve observed different examples of home-brew hub dynamos prior to — even one that provides regenerative braking.(*(*12*)*)

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