This kind of thing has been done before but before I go hacking my new rower to bits I am wondering If I can do something a little less intrusive and use the existing wires and sensors in my Cheap and cheerful V-fit Tornado Air Rower to pick up readings for the Raspberry Pi. I couldn't afford a Concept2 - so settled for this rower instead.
Eventually Id like to program it to connect to a TV on the Wall that can form some meaningful stats or even some semi-competitive AI turning it into a game.
The way the rower works currently is there are two sensors (both from what I can see magnet and sensor, I believe this is hall effect) - the flywheel has 2 magnets and the seat has one. Seat measures the stroke and the flywheel the speed.
Existing Monitor PCB
Existing Connections to Sensors via 3.5mm JACK ??
3.5 mm jack showing the two wire interface
Seat run bar sensor
Inside flywheel - little hard to see but shows two magnets
1. Can I make use of existing sensors to the RPi?
2. The sensors have two wires - I guess a positive and negative - most Hall sensors are three?
3. Which GIPO pins on the RPI should I connect to to get this to read
4. is there any other electronics I need to get this working - ultimatly the best thing would be a 3.5 mm female for both which would mean I could detach the Rpi when ever I wanted
5. Anything I need to be aware of here?