Author Topic: OLED significant digit stability  (Read 2754 times)

Felix

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Re: OLED significant digit stability
« Reply #15 on: February 12, 2021, 02:54:50 PM »
stevie67,
What revision was this CR?
My guess is that it came with the old samba bootloader so no easy way to backup the old firmware and try a newer one.

In the 1.1 firmware I tried some experiments with the ADC sampling (faster at the expense of less averaging and more noise) and decided to revert back as it's more stable.
The 1.0.0 firmware has been in use for about 1 year and is targeted at newer revisions and I think it's the best of all worlds for the average user.
For older units I would recommend sticking with the original firmware, unless that has no logging. There are some minor hardware differences which could have some impact but other than that I can't really be sure about the 0.4mA, it could just be a difference in ADC sampling.

stevie67

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Re: OLED significant digit stability
« Reply #16 on: February 12, 2021, 03:36:30 PM »
Hi Felix,

thanks for the fast answer. The CR is from January 2019, I don't know the revision. So I hope it should be fine with 1.0.0 and it actually works quite well with that version.  But as I said, it would not use the OLED after powering off after firmware update and then powering it on again. The delay fixed that for me.

My CR does not work so well with the newer one. Your description about unstable ADC sampling seems to match what I am seeing. I quite like the FW 1.1, it has lots more features including the USB debugging. Especially I am missing the USB logging. But I guess it is easy enough for me to add it. So that's what I will do.

Thanks,

Stefan