So here’s a low cost sensor kit that was designed by a high school student for the Santa Cruz County Science Fair competition last year, and then this year we made it submersible by putting it in a BR enclosure and using SealCon cable glands to seal the sensor probes.
This kit supports two Atlas Scientific probes and currently tests pH and ORP (oxidation reduction potential). But you could easily switch them to EC (electrical conductivity) or DO (dissolved oxygen) probes.
This kit is integrated with BlueOS on the BlueROV2 using Node-RED. We created a Json string in the Arduino project that outputs to the serial USB port and is connected to the BlueROV2’s RPi4 for real-time data display and logging. Node-RED also has a dashboard function that displays the data in graphical format!
Here’s the link to the build document I’m working on. Any feedback would be appreciated!