I changed the ESP32 code, the new code is in the project github.

The changes:

• The pH sensor reading switches from pin 13 to 35 because pin 13 is unusable in ADC when bluetooth is enabled
• The code for activating the pump has also been changed
• Other minor bugs fixed

Water level sensors get damaged very quickly even when using the capacitive function of the esp32. I think I will use stainless steel wire to limit corrosion.

The root system of plants is quite impressive. The lettuce on the top left has already been cut three times (leaving some leaves on). It has grown back to its pre-cut size in a week.