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rrrlasse / powerino

Arduino based bicycle power meter
GNU General Public License v3.0
44 stars 9 forks source link

How accurate and consistent is it? #4

Open holger8080 opened 3 years ago

holger8080 commented 3 years ago

Do you know how accurate the readings are - just ballpark? Has anyone made a comparison with a power meter (like the Garmin)?

I'd be interested to know: a) the offset (ballpark, is it 1%, 10% or >25%) b) whether the offset is constant or varies depending on cadence, torque, etc. (also just ballpark, is it 1%, 10% or >25%).

(sorry should the question be misplaced in issues - but wouldn't know where else to ask)

kudmich commented 3 years ago

@holger8080 Today i started the circuit soldering process. I will have a direct comparison with the inpeak power sensor. I'll be in touch in a few weeks.

holger8080 commented 3 years ago

@holger8080 Today i started the circuit soldering process. I will have a direct comparison with the inpeak power sensor. I'll be in touch in a few weeks.

Awesome, please keep us posted!

felipeuebelhart commented 3 years ago

Hello guys, I'm from Brazil, sorry if I have some English mistakes.

I built the powerino as shown in the manual. I am doing some tests and comparison with a kinetic trainer. First, I noticed that the power variation is not constant.

It is like: 100w on the trainer is 100w powerino. 120w on the trainer is 105W powerino. 150w on the trainer is 110W powerino.

Some questions:

**Has anyone performed some tests and had similar results?

Can the position of strain gauges influence this deviation?

How to build an equation to compensate for this deviation and obtain more accurate results?**