I have a indoor rowing machine with a monitor that just doesn't work the way I want. I've used Concept 2 rowers at the gym before, and I like the way the data is presented on the performance monitor. But, $1000 for a Concept 2 isn't in the budget.
It would be a fun project to make a performance monitor for the rower I have. I'm not sure of all the details, but I think I could read the output from the two sensors with an Arduino and calculate various performance metrics, and drive a small LED or TFT display to show them. I'd have the flexibility to monitor the metrics that are important to me, and to design the display to show the most important ones more prominently.
Anyway, I think to start I'd need to know what kind of output the sensors give. There's one on the resistance wheel that has a magnet that passes by it once per revolution of the wheel. And a second sensor I haven't really gotten a look at, under the rail that the seat rolls on. I suspect that also has a magnet that passes over the sensor every time the seat rolls back or forward.
So (finally), my question is what do you think I'd expect the signal from each sensor to be? The standard monitor unit has two AA batteries in it, so I suppose the circuit has 1.5V or 3V on it. Would the wires from the sensors probably have a low, or no voltage on them normally, then a pulse of full voltage when the magnet passes by the sensor? Or the other way around, full voltage, and when the magnet passes over the sensor it drops to nothing?
Would I be able to tell just from a simple DMM and watching the voltage reading when I position the magnet next to the sensor? I'm not sure how small the pulse from the sensor would be. I do have an Arduino with a data logging shield.
How would you go about determining what that signal looks like?
Thank you for any help!
Keith
It would be a fun project to make a performance monitor for the rower I have. I'm not sure of all the details, but I think I could read the output from the two sensors with an Arduino and calculate various performance metrics, and drive a small LED or TFT display to show them. I'd have the flexibility to monitor the metrics that are important to me, and to design the display to show the most important ones more prominently.
Anyway, I think to start I'd need to know what kind of output the sensors give. There's one on the resistance wheel that has a magnet that passes by it once per revolution of the wheel. And a second sensor I haven't really gotten a look at, under the rail that the seat rolls on. I suspect that also has a magnet that passes over the sensor every time the seat rolls back or forward.
So (finally), my question is what do you think I'd expect the signal from each sensor to be? The standard monitor unit has two AA batteries in it, so I suppose the circuit has 1.5V or 3V on it. Would the wires from the sensors probably have a low, or no voltage on them normally, then a pulse of full voltage when the magnet passes by the sensor? Or the other way around, full voltage, and when the magnet passes over the sensor it drops to nothing?
Would I be able to tell just from a simple DMM and watching the voltage reading when I position the magnet next to the sensor? I'm not sure how small the pulse from the sensor would be. I do have an Arduino with a data logging shield.
How would you go about determining what that signal looks like?
Thank you for any help!
Keith