Products > Test Equipment
EEVBlog 121GW Multimeter Firmware Details
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exe:
I think too he mentioned he has sources.

I tried to write my own firmware, but failed due to underestimation of effort and lack of knowledge of stm32. I thought I'd write a basic firmware in a few evenings, but failed even to get LCD working :/. Then I realized that I don't know how to control the main IC, and its datasheet was uncomfortably big.... So, many things it seems need to be implemented from scratch, it's not like an arduino-style development when all it takes is just install libraries and bind them all together in main().
e0ne199:
any info for new firmware?? 2.00 really is full of bugs anyway
firewalker:

--- Quote from: exe on June 27, 2019, 08:26:45 am ---I think too he mentioned he has sources.

I tried to write my own firmware, but failed due to underestimation of effort and lack of knowledge of stm32. I thought I'd write a basic firmware in a few evenings, but failed even to get LCD working :/. Then I realized that I don't know how to control the main IC, and its datasheet was uncomfortably big.... So, many things it seems need to be implemented from scratch, it's not like an arduino-style development when all it takes is just install libraries and bind them all together in main().

--- End quote ---

There is a basic open firmware with "Hello World" example.

https://github.com/tpwrules/121gw-template

Alexander.
daveyk:
"I just bought the 121GW from Welectron here in Europe and it came with firmware 1.61 so the 1.58 is already "old""

I just bought mine (June 2019) directly from Dave, and it is running 1.57 Firmware.  I find the resistance mode very sluggish.  Maybe new firmwar would fix that?  I need to locate firmware and then I guess go buy a micro-sd card.
darik:

--- Quote from: daveyk on July 11, 2019, 04:37:50 pm ---"I just bought the 121GW from Welectron here in Europe and it came with firmware 1.61 so the 1.58 is already "old""

I just bought mine (June 2019) directly from Dave, and it is running 1.57 Firmware.  I find the resistance mode very sluggish.  Maybe new firmwar would fix that?  I need to locate firmware and then I guess go buy a micro-sd card.

--- End quote ---

2.0 is definitely faster autoranging in resistance mode. To get it, go here and click on "firmware": https://www.eevblog.com/product/121gw/.

I thought all the meters came with a micro-SD card. Or was that just the kickstarter? Anyhow, you should probably check and make sure there isn't already one in there.
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