bicycle anometer

[bsafe]

I have googled the board looking for the conversion number for a bicycle computer based anometer built using the cup assembly sold by Otherpower.

  Googling, I found the numbers 1320 and 2682 to program the bike computer. The cup assembly has a diameter of 8.5 inches and the magnet for the reed switch is located one inch from the center of the cup assembly. Thank you in advance. bsafe

[imsmooth]

I have a sigma computer and use 1440 for mph.

[Norm]

 The distance of the magnet from the center is

nothing to do with it....it's only going to count

once per revolution.

 The little phamplet that comes with the digital

bike speedometer gives the formula for any sise

diameter wheel.

http://www.instructables.com/id/Digital-Anemometer-wind-meter/

According to this author he programmed it to a

wheel 3 times the size so it reads 3 times actual

speed..... ( I put cups on 10 inch arms so digital

thinks it's a 20 inch wheel)

Google how to program a digital bike speedometer.

[bsafe]

I googled this board and the interweb, then I asked the question. As mentioned here and other sources there is a certain amount of "slip" that occurs when using the bicycle computer in this application.

Calibration for a fluid  is a bit of  a different proposition from a bicycle wheel contacting pavement. I am curious what calibration number someone that had built and calibrated the computer as a wind speed measuring device (the RPM device will be next) came up with.

I used The diameter of the cup assembly and the readings seemed unreliable.

[winDorlose]

When I made mine I took a ride in the car and experimented until I was satisfied will the results. I used a gps on a calm night.

[bsafe]

I like the GPS solution, how high above your vehicle did you mount it? I relied on math the firt time I calibrated       and came up with 1550 which did not "feel" right. I stopped at several T.V. stations to see If the weatherperson had a handheld Kestral wind meter, but no luck. I will try the GPS method next probably mounted on my bicycle to minimize the disruption from the vehicle.