Lengths Counter for Swimmers
An example application using speech synthesis, an accelerometer, and a magnetometer
Published in issue 427, July/August 2012
There’s no lack of distance counters for walkers or cycling; but swimmers are reduced to mentally totting up how many lengths of the pool have been complete, for want of a counter suitable for their favourite sport. The project described on these pages got designed to build an electronic solution that takes care of this tedious counting. The result is a device that’s reliable, handy, light, discreet – and inexpensive.
Main technical specifications
• small unit worn on the back of the swimmer’s head, under the goggles strap
• vocal announcement of distance without waterproof earpieces
• error rate < 5 %
• powered by two AAA cells
• compact: 96 × 47 × 24 mm
• system open to lots of other applications
Click below to download a PDF copy of this article from Elektor magazine.
Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.