Originally Posted by
Bill Kapaun
Read over this article-
Very Easy Cadence Meter For Your Bike <$12
You can see how the MATH is used to do something different. Count crank RPM instead of speed. The distance function is moot.
You can work it the other way to measure distance, where the speed is moot.
Just play with the numbers.
You may have to use several magnets to cut it down to usable "units", but just use the "Trip Meter" function and reset it for each use. (or keep the current odometer reading in your head and know when the next "mile" is logged.
Hi, Bill;
I returned the Velo 7, and purchased 2 of the $10 wireless models with 0mm to 9999mm circumference settings. The directions are simpler to follow, but the buttons basically have the same functions. I have a sort of stepped drum that will be used to measure out two lengths of yarn. The smaller side has a circumference of 753mm. The larger, C = 1296mm. The drum has 4 evenly spaced spokes. I have the two magnets that came with these two units attached to opposite spokes. Additional magnets could be added to the other two spokes, or total magnets could be reduced to 1 without difficulty. A single installed sensor reads their every pass, and both computers receive the signal from the it; they are installed 26cm & 31cm from the sensor.
The smaller drum will need to measure sample hanks that are 21 yards / 19.202 meters
The larger drum will need to measure sample hanks that are 78 yards / 71.323 meters
I've read the "How it works" section at the bottom of the
Instructables page to which you referred me many times, but I'm not math-wise enough to figure out how to form the equation. If I've given you enough information, and you have the time, could you show me how to think this through so I can do it when I need to replace these units someday?