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I added MQTT logging to my 121GW via BT/WiFi (lemmy.world)

submitted 3 weeks ago by tjhowse@lemmy.world to c/electronics@discuss.tchncs.de

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Hi all!

I thought y'all might be interested in my weekend project: Using an ESP32 to read the value from my 121GW DMM and send it to my MQTT broker via Bluetooth and WiFi. This workflow is much better for me compared to logging to microSD cards. The code is an ESPHome config that can straightforwardly be flashed onto most ESP32 variants.

The config and some documentation is available here: https://github.com/tjhowse/121gw-esphome

A brief video explainer is here: https://youtu.be/GLtkTARH1eo

At the moment I'm only unpacking the main value, range and sign from the Bluetooth packet. It would be nice to read out the rest of the values, but I haven't felt the need yet. Note that the DMM briefly blanks the display when changing ranges. This results in a value of zero being sent on the MQTT link. All of my testing has been in volts mode, other modes may contain dragons! Please test thoroughly before relying on this for anything important.

Cheers, tjhowse

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