STM32 powered multimeter

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racemaniac
Posts: 696
Joined: Sat Nov 07, 2015 9:09 am

Re: STM32 powered multimeter

Post by racemaniac » Tue Dec 05, 2017 8:37 pm

RogerClark wrote:
Tue Dec 05, 2017 8:34 pm
Its a strange world.

People buy BluePill boards with defective USB as they wont pay an extra dollar for a maple mini.

But people will spend $200 on a multimeter, and then only use $10 worth of its features and capabilities.
true XD

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Pito
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Re: STM32 powered multimeter

Post by Pito » Tue Dec 05, 2017 8:44 pm

Do you mean they will do measurements with 2500 counts only? :D
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dannyf
Posts: 228
Joined: Wed May 11, 2016 4:29 pm

Re: STM32 powered multimeter

Post by dannyf » Sat Dec 09, 2017 2:44 pm

the simplest way to get +/- 32000 counts is with ADS1100
I'm a big fan, for adc, of F350 from Silabs. 24bit adc, and PGA. the only catch there is your choice of oscillator to minimize jitter.

ag123
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Joined: Thu Jul 21, 2016 4:24 pm

Re: STM32 powered multimeter

Post by ag123 » Sat Dec 09, 2017 5:46 pm

actually stm32f103 with 12 bits adc, my guess is that it is literally pretty accurate as 2^12 = 4096
i'm not too sure how that'd translate to counts though and i'm wondering if we use both adc on stm32f103 would there be possibility of getting higher precision?

dannyf
Posts: 228
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Re: STM32 powered multimeter

Post by dannyf » Sat Dec 09, 2017 6:58 pm

actually stm32f103 with 12 bits adc, my guess is that it is literally pretty accurate as 2^12 = 4096
for a noise free measurement, a 12bit adc may deliver 10bit, and likely 9.x bits. Plus, the inability to use dual reference in makes it harder.

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