Using the SP-2 TDS probes with Arduino

Projects Discussion and Showcase Device Hacking
1

Hello,

I have seen a few posts here regarding TDS but I wanted to see if anyone can guide me in getting TDS from the mentioned probes.

The probes are:

These are used by the very common meter:

These are very accurate and inexpensive meters but I would like to integrate the readings in a larger project. So, my thought is to buy the probes and somehow interface them with the Arduino.

Now, I know that TDS measurement is a complicated issue in of itself and that DM-1 meter is probably doing a lot of cool stuff, but seeing that the probes have 4 wires each (8 total for the dual) does anyone have any clue as to how these are interfaced properly?

Any hints or guidance will be of immense help!

2

Not easy to read indeed, you need to use an AC signal for that.

Really gotta get my kickstarter going now... until then, have a look at the driver in my github page. I'll also post the schematics and so there later. Really gotta get the campaign up and running first :slight_smile:

3

Thanks for the response! Yah that would be great, any schematics or tips on implementation would be a great start.

Have you seen the sensor from DFRobot? They're doing something similar to you I think (although they have analog out).

4

Hello,

I am trying to use HM Digital SP-5 Single TDS Sensor Probes with 4 Pin Connector with Arduino. I am trying to make the TDS meter with this probe. But I am really confused how to connect it to Arduino.

Can anyone guide me with this?