Karoo 2 & SRM power meter - "auto calibrating" when auto-pausing
Answered
I have noticed this behaviour with the last two firmware versions on my Karoo 2...
When I stop and the unit goes into "auto-pause", when I start riding again the power values displayed are way too low. What I discovered is that the value stored as the zero offset goes from the low 500s to the 800s. I have to stop, go into sensors and my SRM and calibrate it. The zero offset value gets stored and all is good. Until the next time I have to stop and the Karoo 2 goes into "auto-pause".
Only started seeing this happen with the last 2 firmware versions that have been released. Before these versions, I never had this issue.
So, back to my PC 8 unit it is.
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Hi All,
Thank you for posting & bringing this to our notice!
We did roll out a fix for issues around power inaccuracies with SRM power meters a few releases back. Could you guys confirm if power figures are discrepant even after removing the Power meter from the Karoo and refreshing the connection by pairing it once more?
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The fix you rolled out for SRM PMs before was to fix the cadence numbers not being available.
I can confirm that unpairing and repairing my SRM does not fix it. I even tried doing a factory reset and tried reordering the paired sensors. Please do not suggest that as that is not a fix as I’ve done it numerous times - it is such a bad experience.
The issue is that the Karoo will zero the SRM and does it when you’re pedalling. You’re essentially under reporting the power cuz its calibrated with force being applied. This was not an issue previously so you have introduced a bug when you fixed the cadence issue. It is so frustrating how you do release management.
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@Akhil,
John's description of the issue is exactly what is occurring to me. This is obviously an issue that has been introduced with a change that has been made to the firmware. It was working for me up until I installed software version 1.223.1071. It is happening with the current software release version 1.226.1077
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Hi All,
Thank you for sharing your observations here. I have created a ticket for each of you to track this issue further. You must have received an email notification as well. It would help us greatly if you could share the FIT files of the rides where you encountered this particular concern.
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Same problem here, SRM re-calibrates mid ride.
I have some a fit file where i stopped at 50:39 to re-calibrate.
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Hey guys, the problem is not solved !!! From the first time I wrote a software update has been released that has made the operation a little more stable but however the calibration is most of the time wrong with and the wattage data is unreliable. Yesterday I practically ran a race without the given watt because I couldn't stop and recalibrate .... It's a rather embarrassing situation!
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Hi All, we are still working on this case, but it has not given us the desired output to consider it as solved. We may want to reach out to a few users and involve a member of the software team to work with you. Please let us know if anyone will be willing to get on calls/video call in order to solve the problem. Thank you.
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Hi Ali, I have read your post but I have to contradict you the problem is not solved at all! SRM users have probably abandoned Karoo 2. I continue to have problems with calibration at every output, and every time I have to stop to perform the calibration procedure. It can be said that it works better than in the past, but that the problem is solved is another thing.
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@Andrew Payne While I have not tried disabling the auto-pause setting, in theory it may prevent this auto calibration issue; this is assuming the issue is related to resuming from auto-pause and not a zero speed.
What I find absolutely annoying about this issue is that the unit used to work. Then, in one of the firmware updates the ANT sensor code was re-written/changed/updated and introduced this bug. Not good. I suspect the reason this bug was never caught in QA is due to the fact that the number of people using an SRM/Karoo 2 combination is small and was never tested at all. Therefore this is a complete QA failure.
It sucks because I paid money for the product and it worked. Then an update was pushed out and I ended up with a product that does not work correctly any longer. It has been months so far and honestly I do not have much confidence in this getting resolved. I have relegated the Karoo 2 into a drawer somewhere and have gone back to using my PC8 head unit from SRM. That one works perfectly and collects accurate power data.
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Thanks, Andrew.
@all - We have a fix and would require help from users who easily reproduce this issue on their SRMs. Before rolling out the fix, in an OTA package we need to test if the fix is actually working in the code or not.
I have connected with some of you on this thread over the email and will be sharing the details of the test. Please respond to me over there. We require you to have ADB installed on your computer, to install the sideloaded fix that will be provided in the APK file.
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Hi, The guys at Hammerhead sent me a fixed (as per the above comments) for this SRM calibration issue and did solve that problem. This fix was rolled out on general release on Thursday 27th Jan 2022.
I then found another issue that sometimes when starting pedaling caused massive power spikes to be reported. These were well over double what I could reasonable produce. This had minimal impact on the ride average figures, but is a serious issues if tracking max power levels. Ali was very responsive and having provided SRM PC7 and Karoo .FIT files, confirmed overnight that it was an issue and they would work to resolved this. A fix was provided in under two weeks. I've been using this fix for the last 5 days and both the Karoo and SRM PC7 are reporting consistent figures.
All now looks good on the SRM power meter front with the Karoo.
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Just moved over from a Wahoo Roam and noticed my SRM power numbers are reading much lower than on the Roam, even after calibrating, wondering if this is still an issue. Gonna watch for it on tomorrow's ride, sad we have to do quality control on a product that has been on the market this long.
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Agree with you Jay. I just finished a ride last week in the Rockies where my power was registering correctly. Then after a short auto pause it was showing my power as I climbed battle mountain at sub 100 watts. When I stopped and looked at my settings it had taken my offset from mid 500s to mid 700s. After I recalibrated again every thing was good.
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