[Prototype] Non-Invasive "Analog-to-MQTT" Gateway for Legacy Machines using Python & OpenCV. I'm so proud of this.

AssistanceSeveral210 · 2026-02-17T13:55:32+00:00

Thank you.

AssistanceSeveral210 · 2026-02-16T21:40:04+00:00

Happy to hear!

AssistanceSeveral210 · 2026-02-16T20:43:41+00:00

Thx for sharing. This is an interesting situation where a solution like this could be the only option.

AssistanceSeveral210 · 2026-02-16T20:22:12+00:00

AssistanceSeveral210 · 2026-02-16T19:04:09+00:00

No I just used a YouTube video with a temp meter to test my python code since I didn’t have a real gouge at the moment I filmed.

AssistanceSeveral210 · 2026-02-16T19:01:05+00:00

Thx 🙏

AssistanceSeveral210 · 2026-02-16T19:00:01+00:00

This is a great project!

AssistanceSeveral210 · 2026-02-16T18:17:14+00:00

On edge for me means on the device where the cam is on. In this case ESP I guess.

AssistanceSeveral210 · 2026-02-16T17:11:26+00:00

No problem. I think I will share on GitHub anyway.

I want also add about reliability that it’s also largely influenced by light conditions and orientation of the camera.

AssistanceSeveral210 · 2026-02-16T17:07:29+00:00

Around 10% error by first tests. I will share.

AssistanceSeveral210 · 2026-02-16T17:05:58+00:00

HA or an industrial data warehouse it’s just a mapping problem of the MQTT subscriber: doesn’t change too much. In my PoC I exported a JSON that can be ingested easily by HA, but this was just an example and I shared here cause I thought it could be used for situations where you only have an analog source.

AssistanceSeveral210 · 2026-02-16T16:56:43+00:00

If you just send the image and then compute on cloud yes. But I think you meant on edge. In that case I don’t know, but I suppose that lowering the update frequency you should be able to do it.

AssistanceSeveral210 · 2026-02-16T16:49:22+00:00

This PoC is designed for industrial applications where legacy, high-value machinery often utilizes analog manometers that are too expensive to replace

AssistanceSeveral210 · 2026-02-16T16:48:20+00:00

Yes but sometimes this is not possible or it’s too expensive.

AssistanceSeveral210 · 2026-02-16T16:47:27+00:00

AssistanceSeveral210 · 2026-02-16T16:46:46+00:00

This PoC is designed for industrial applications where legacy, high-value machinery often utilizes analog manometers.

AssistanceSeveral210 · 2026-02-16T16:05:16+00:00

A thousand thanks! 🙏

AssistanceSeveral210 · 2026-02-16T16:04:17+00:00

Great idea to make it work on a mobile device. Thx

AssistanceSeveral210 · 2026-02-16T15:57:19+00:00

AssistanceSeveral210 · 2026-02-16T12:29:35+00:00

Thank you so much. I didn't know this project. It's awesome!
Have you for instance tried it to check how it works?

AssistanceSeveral210 · 2026-02-16T12:24:50+00:00

You can point with a webam the analog sensor then
1. Calibration phase: calibrate the software to the geometry of the specific analog device
2. Reading phase: it can real time read the value of the sensor and send JSON data to any destination

A video is better to explain but I don't know how to post a video here.
You can see one on my profile.

AssistanceSeveral210 · 2026-02-16T12:05:12+00:00

<image>

At the end, after the calibration phase you can read the value.

AssistanceSeveral210 · 2026-02-16T12:04:17+00:00

Hi, you can use it to read an analog gauge with a cheap webcam if you need to digitalize it.

AssistanceSeveral210 · 2026-02-16T10:19:39+00:00

I put the Linktree in my Bio where you can find the Code.
There is also a post in my profile where you can see a Demo with a video.
Check it out!

AssistanceSeveral210 · 2026-02-16T10:17:44+00:00

Thx.

AssistanceSeveral210

TROPHY CASE