I did a search on this topic, but was not able to find exactly what I'm looking for and don't really want to reinvent the wheel (pun intended) if I don't have to...
I want to adapt a cheap bike computer as a cadence display for a spin bike. What I lack is the computational skill to accomplish that feat. Here's my plan: Since a regular speed sensor on a bike computer simply measures the time it takes one rotation of the wheel and calculates either MPH or KPH from that, I should be able to, by inputting a certain value for circumference of the wheel be able to achieve an RPM read out, right. I realize that most cycle computers don't go up to 100+ MPH, so what I thought was to reduce the readout calculation by a factor of ten. That way 10 MPH readout would mean 100 RPM cadence. And, since most cycle computers read out to the 1/10 MPH, I should get a usable figure. Anyway, I was wondering if anyone had tried that and if so if they would share the calculation or method of calibration ...