ADC measure negative voltage??

The official pyboard running MicroPython.
This is the reference design and main target board for MicroPython.
You can buy one at the store.
Target audience: Users with a pyboard.
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jimmo
Posts: 660
Joined: Tue Aug 08, 2017 1:57 am
Location: Sydney, Australia

Re: ADC measure negative voltage??

Post by jimmo » Wed Jul 03, 2019 10:50 pm

You don't really need to turn off the ADC? Unlike the timer it's not doing anything when you're not using it.

starter111
Posts: 40
Joined: Wed Mar 08, 2017 7:24 am

Re: ADC measure negative voltage??

Post by starter111 » Thu Jul 04, 2019 12:18 am

I think some hardware issues on my side, I have multiple IO, ADCs, connect to other device. The issue is when I power cycle other device once a while cause pyboard ADC not working anymore. But if I power down by steps, 3.3, 2.5, 2, 1.5..0 and the issue fixed.

starter111
Posts: 40
Joined: Wed Mar 08, 2017 7:24 am

Re: ADC measure negative voltage??

Post by starter111 » Thu Jul 18, 2019 8:33 pm

I have more question...

Is it any free to use R/W register that I can save calibration value for each board, that won't get erase even Factory reset?

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jimmo
Posts: 660
Joined: Tue Aug 08, 2017 1:57 am
Location: Sydney, Australia

Re: ADC measure negative voltage??

Post by jimmo » Thu Jul 18, 2019 9:28 pm

If the filesystem isn't suitable, then you might find this uesful

viewtopic.php?f=12&t=6679

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