STM32 powered multimeter

Anything not related to STM32
racemaniac
Posts: 658
Joined: Sat Nov 07, 2015 9:09 am

STM32 powered multimeter

Post by racemaniac » Fri Feb 17, 2017 2:41 pm

I read on EEVBlog that Dave is creating his own multimeter together with a company. He's already using prototypes in his videos, one of the last replies in the thread he said the following about the hardware:
STM32L152D
Schematic and protocols will be open, not sure about firmware.
Standard low cost ST ARM programmer header.

could become a fun device to hack XD (and it'll also have an esp8266 in there for bluetooth connectivity)

http://www.eevblog.com/forum/chat/new-e ... msg1137968

User avatar
ahull
Posts: 1672
Joined: Mon Apr 27, 2015 11:04 pm
Location: Sunny Scotland
Contact:

Re: STM32 powered multimeter

Post by ahull » Fri Feb 17, 2017 8:55 pm

Looks like a fun project. If it uses a 50,000 count DMM chip it will also be genuinely useful rather than just a fun thing to hack. Does this mean I will have an excuse to buy yet another multimeter. I'll need to do a DMM head count and figure out how many I already have. I suspect the number is bordering on the mildly obsessional already. One more might push me in to "requires psychiatric advice" territory. ;)

EDIT: OK I'm sure I can fit in at least one more... I only have..
1 x Uni-T 61E - with manufacturers opto-isolated serial and home opto-isolated made USB serial dongles.
2 x Victor VC921 - hacked by my alter ego "itsthatidiotagain" for opto-isolated serial. => https://www.eevblog.com/forum/testgear/ ... or-vc-921/ and for 8000 counts.
2 x DT-830B - genuine exploding 2000 count "Chinese fire cracker" multimeters (yellow)
1 x DT-830B - ditto but in blue.
1 x Uni-T "Logic analyser" 2000 count circa 1995?
1 x Victor "Pocket multimeter" origin unknown.
2 x Draper brand Fortune semiconductor based multimeters.
1 x Fluke 17b (in the office)
.. and no doubt a couple of others ...
- Andy Hull -

User avatar
Pito
Posts: 1700
Joined: Sat Mar 26, 2016 3:26 pm
Location: Rapa Nui

Re: STM32 powered multimeter

Post by Pito » Sat Feb 18, 2017 11:14 am

I think the simplest way to get +/- 32000 counts is with ADS1100 - 6pin complete acquisition system.
Works great (mind it has got a fixed i2c address so in case you need several on a single i2c bus you must order chips with different addresses).
I've tried as a high-side current meter with success.
There are other ADS1xxx as well.
Pukao Hats Cleaning Services Ltd.

User avatar
RogerClark
Posts: 7544
Joined: Mon Apr 27, 2015 10:36 am
Location: Melbourne, Australia
Contact:

Re: STM32 powered multimeter

Post by RogerClark » Sat Feb 18, 2017 9:43 pm

I wonder if this is the project that Dave bought the STM32L4 discovery board for.

Dave did a video about the STM32L4 several months ago, and I can see that the discovery board would be an ideal testbed for this, as it has a large monochrome LCD display.

Part from the someone else ripping off Daves design and producing it more cheaply, I think he would be better off making the firmware open source, on github as it would save him a fortune in dev costs if he just published basic functionality and the community is likely to write loads of enhancements.

racemaniac
Posts: 658
Joined: Sat Nov 07, 2015 9:09 am

Re: STM32 powered multimeter

Post by racemaniac » Tue Dec 05, 2017 12:38 pm

Daves multimeter is now on kickstarter:
https://www.kickstarter.com/projects/ee ... ultimeter/

i'm really considering getting this :)
fully open hardware design
stm32 based, with st link header available, but also firmware updatable via micro sd card
and probably just a great multimeter for what we do :)
and a lot of connectivity options :)

ag123
Posts: 827
Joined: Thu Jul 21, 2016 4:24 pm

Re: STM32 powered multimeter

Post by ag123 » Tue Dec 05, 2017 3:54 pm

OT
on the web while hoping from sites to sites, i stumbled into one of these
https://www.eevblog.com/forum/testgear/ ... eo-review/
they are rather cheap
https://www.ebay.com/sch/i.html?_nkw=an8002&_sacat=0
and i picked up one from a local web market/store doing a promotion, it is shipped from china though
--------
back on topic, i think the idea of having bluetooth and logging in a multimeter is a rather useful feature perhaps
though for most of the times, i simply use the little multimeter as a beeper to check connectivity / shorts and basically to measure voltages / resistance

User avatar
RogerClark
Posts: 7544
Joined: Mon Apr 27, 2015 10:36 am
Location: Melbourne, Australia
Contact:

Re: STM32 powered multimeter

Post by RogerClark » Tue Dec 05, 2017 8:16 pm

Unless I am miss-reading the kickstarter page, the cost if the meter appears to over $250 AUD, ( probably around $175 USD) !!

Its definitely well out of my price bracket

racemaniac
Posts: 658
Joined: Sat Nov 07, 2015 9:09 am

Re: STM32 powered multimeter

Post by racemaniac » Tue Dec 05, 2017 8:24 pm

RogerClark wrote:
Tue Dec 05, 2017 8:16 pm
Unless I am miss-reading the kickstarter page, the cost if the meter appears to over $250 AUD, ( probably around $175 USD) !!

Its definitely well out of my price bracket
it's indeed not cheap >_<
and it's more like 200$... pretty high end meter

User avatar
Pito
Posts: 1700
Joined: Sat Mar 26, 2016 3:26 pm
Location: Rapa Nui

Re: STM32 powered multimeter

Post by Pito » Tue Dec 05, 2017 8:33 pm

I paid the same for the Metex M-3850 (long time back..) thus it is not expensive :P
Pukao Hats Cleaning Services Ltd.

User avatar
RogerClark
Posts: 7544
Joined: Mon Apr 27, 2015 10:36 am
Location: Melbourne, Australia
Contact:

Re: STM32 powered multimeter

Post by RogerClark » 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.


Edit.

i dont think these two groups of people will actually overlap.

I suspect anyone who wants save $1 and solder a resistor to a BluePill, is not likely to then go out and spend $200 on a multimeter

Post Reply