This project is a replacement for the WaterRower A1 monitor. It runs on a Arduino Yun with an LCD Shield on top.
The Yun reads reads the speed of the wheel via a 2-wire sensor located on top of a disk with 6 magnets.
Every time the magnet goes under the sensor arduino generates an interrupt.
Right now it can keep track of the duration of the exercise, distance, intensity (meters x seconds), 500 meters splits and can save the data on an SD card. It also has it's own web server that reads the saved data and creates a simple graph with the stats.
if you are interested please send me an email: giordy_at_giordy.it