02-05-2022, 02:11 AM
The pH uses I2C, that's the EZO driver in reef-pi with address 99. The program will automatically detect this, you should get a popup saying a new I2C device was detect, select pH and give it a name. It seems there was a problem in 6.3 where it wasn't being detected all the time. With 6.0 you should see it.