Power datafield with polynomial setting

Good morning, I ask if someone could create a simple datafield (for fenix3 and epix) to return the power value while using my old travel elite fluid. I ask, if it is possible, to have a datafield which can be setted from Garmin Express (the A,B,C,D values) with this idea: Returned value = Ax^3 + Bx^2+Cx+D "Watt" where "x" is the actual speed (obtained from a ANT+ speed sensor mounted on bike).
Thank you to every one!

Nikeow over 9 years ago

https://apps.garmin.com/en-US/apps/ad65c289-aac9-49e8-8532-638f85596bbc

This datafield will do that and more!
Of course you will need to upgrade to PRO by emailing the developer.

travis.vitek over 9 years ago

This would be very easy to implement. It is probably a lot more difficult to get the factors than to implement the data field. I'd be happy to throw something together.

Do you happen to know the constants for any of the popular cycle trainer devices?

albertopirro over 9 years ago

Good morning, I obtained values of my (very very) old travel elite mounting a bike of my friend with power meter on it, then I done a progressive workout and at the end, analyzing the fit file, I created a Excell sheet putting in columns the speed and the power corresponding to the speed. Then it was enough brush up my college studies of mathematics and physics to get a polynomial with the highest number of R ^ 2 and got the 4 values. Do you believe that you can make a simple datafield so I can test it?
Unfortunately I have no other travels so I can test it and keep values in this way.
Thank you very mutch

travis.vitek over 9 years ago

Yes. I made it last night. I found some data for a few trainers and inserted them as well. This allows the user to pick pre-defined trainer coefficients or to define the coefficients as they see fit.

I'm going to package this up and put it into the store as it seems useful.

Travis

albertopirro over 9 years ago

Good morning, this is a very nice datafield! Only a question: in the polynome AX ^3 + BX^2 + CX + D, the speed X is considered in km/h or m/s? Thank you very mutch!

travis.vitek over 9 years ago

It is now mi/hr as that is what all of the data I'm finding is using. I have verified it is working correctly now with v1.0.1.

Travis

albertopirro over 9 years ago

Ok perfect! Thank you very mutch!