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emmebrusa / TSDZ2-Smart-EBike-860C

TSDZ2 Open Source Firmware adapted to 860C display
GNU General Public License v3.0
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Torque sensor calibration instructions #20

Closed bogardon closed 1 month ago

bogardon commented 2 months ago

Hi,

I've read through https://github.com/emmebrusa/TSDZ2-Smart-EBike-860C/wiki and https://github.com/OpenSourceEBike/TSDZ2_wiki/wiki/Features-and-configurations-on-display but I'm still not clear on the calibration instructions.

It seems that the original firmware is a lot more involved and requires taking 8 measurements per pedal for a total of 16. As far as I can tell, I should not follow those instructions for this firmware, is that right?

The instructions for this firmware don't cover everything I see under the Torque sensor section (I'm using v20.1C 5.0), for example:

Undocumented fields

Can anybody clarify what those are? And if I need to touch them for calibration?

Instructions

  1. Go to Technical section and find ADC torque sensor.
  2. Turn crank side pedal to 3 oclock position and record value of ADC torque sensor without any weight on it.
  3. Hold the brakes and put all your weight on the crank side pedal in the same position and record new value of ADC torque sensor.
  4. Go to Torque sensor section and enter value obtained in step 2 into Torque adc offset.
  5. Enter value obtained in step 3 into Torque adc max.

Bonus steps:

  1. In Torque sensor section, set Weight on pedal to 25.
  2. Hang 25kg of weight on the crank side pedal in 3 oclock position with brakes applied.
  3. Go to Technical section and record value of ADC torque sensor.
  4. Go back to Torque sensor section and enter value obtained in step 3 into Torque adc on weight.
  5. Set Default weight to no.

Are the above steps correct? Do I need to do anything with the non-crank side pedal? How do I correctly set the value of Torque adc step? Thanks in advance!

bogardon commented 2 months ago

I set Torque adc offset and Torque adc max according to my steps above and came out with 145 and 292, so I think I'm good in that there is >140 difference between them.

However, I feel the human power calculations feel off. Reading further, I realized I had to complete the bonus steps with the 25kg weight, but before I try that (also still need clarification on how to do it), I tried to set Default weight to yes, but it keeps resetting back to no for some reason. Anyone know why?

bogardon commented 2 months ago

So I ended up doing the 25kg calibration. I actually used 24 for weight on pedal because for some reason whenever I confirm any value near 25, it just changes it to 24 anyways.

The human power is still very inaccurate. It underestimates by a lot, so much so that I thought it was more accurate without calibration.

See my attached torque sensor screen.

IMG_0548

bogardon commented 1 month ago

Closing this because it was answered here:

https://endless-sphere.com/sphere/threads/tsdz2-osf-for-all-displays-vlcd5-vlcd6-xh18-lcd3-860c-850c-sw102.110682/post-1815640