Water quality pH0-14 Sensor

ESPHome
1

Hi. Now that the warm season has started again, we would like to put a small pool in our garden. So that the water quality is right, I would like to measure the “pH value”. This is of course very easy, or a little more complicated. Of course, I opted for the complicated variant. Now I have also found a sensor that can measure the “pH value” [This one](#Aliexpress € 4,53 | Flüssigkeit PH0-14 Wert Erkennen Sensor Modul + Ph-elektrode Sonde BNC für Arduino https://a.aliexpress.com/_BSB8Q8) I would like to have this displayed via ESPHome in HA. The sensor is not listed on the ESPHome.io site. But I know that it is an analog sensor. Can I integrate it like my “Soil Moisture Sensors”? Has anyone done this before? Does anyone have any experience or tips? I would be grateful for information …
Regards

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If it has n analogue output voltage equal or greater than 0-1v you should be ok. Note that the ESP ADC is not very linear, particularly at the extreme ends of its measurement range.
So you might have to do a linear calibration. There’s an example in the yaml file here:

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Thank you for the information. Is there a recommendation for the board? Currently have some Wemos D1 Mini and nodeMCU’s, all ESP8266, are the ESP32 more suitable?

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Great, thank you very much

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The main advantages of the ESP32 are:

  • more memory
  • more analog inputs
  • touch inputs
  • hardware PWM
  • hardware UART

None of which are required. So for this application there’d be little difference.

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I found this product on AliExpress. It advertised a bluetooth feature so I thought I could take a crack at reverse engineering it. It took all day yesterday, but I was able to connect an ESP32 running ESPHome using ble_client sensor to broadcast the readings into Home Assistant.

It does water temperature, EC/TDS, and pH. I haven’t yet calibrated the unit or tested it for accuracy though.

Nonetheless, here is my ESPHome yml definition if anybody else wants to try it: ESPHome definition to pick up readings from the PH-260BD water PH/EC/TDS/Temp sensor - https://www.aliexpress.com/item/1005002707585119.html · GitHub

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