What sensor is required to detect water PH levels?

[10101101]

I would like to build a low-cost smart PH probe that can transmit water PH information. I would like to know the best options for sensors with this capability.

[Jim1]

pH electrodes are pretty much just "wet cell" batteries, usually made of a thin film of a proprietary chemical deposited on glass or ceramic material. They output a small voltage that varies with the activity of a specific ion (H+ in the case of water). A very high-impedance amplifier would be able to convert the output of an electrode to an impedance and level compatible with a common ADC. Electrodes are made for immersion and also to be inserted into a pipeline, for example to monitor wastewater discharge leaving a plant. They usually have a BNC or similar two-conductor connector.

[S.Ma]

Check mikroelectronika click boards, there maybe one that measures PH.

These boards are supported by the STMod+ connector and Fanout board on some new STM32 discovery boards.