Browsing the internet, I stumbled over an interesting video on YouTube were a guy shows a very cheap ESP32+camera solution to read the analog readout of water meters.

The software was developed by JomJol and provided on his Github repository. All you have to do is to buy an ESP32+camera module, flash the firmware und the SD-Card and then the water meter is read.

 

  • ESP32 module from AMAZON
  • Wiki with an excellent description (the YT video shows it visually)

I've followed exactly the download links in the WIKI and descripted and the module works on first try!

Software

WC3

 here you can see the image taken by the camera and the marked ROIs. In the right part you can see the read RAW VALUE.

As the configuration supports from scratch a data feed to an MQTT server, the integration in my IoT-world was pretty simple.

WC4

The watermeter in my home has a gauge down to 100ml - you can see the consumption if you fill a cup of water ...

Hardware

Better don't look at my mounting solution ...

 

WC1

 

WC2

A little bit tricky was the focus of the lens. Factory preset is focus on infinity - the lens mount is fixed with a little dip of glue.

I scraped off the glue with an EXACTO knife. Then, with a lot of feeling and a pair of pliers with round jaws, I very carefully turned the lens - you don't get a good feeling from this. But it worked at the end.The focus is sufficient.

Conclusion

It is really amazing, what can be done with AI on such cheap ESP32 modules - thanks to the author JomJol!

2014 CW (Morse Telegraphy) was added to the German Nationwide Inventory of Intangible Cultural Heritage.

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