Reply To: Watering only when the moisture sensor switches on

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You turn the small pots with a small Phillips screwdriver.

If it is damp but the LED is off, turn to the right until the LED lights up.

If it is dry but the LED is on, turn to the left until the LED goes off.

The A2D is powered by the OSpi, the pin assignment is (left to right): GND, SN1, SN2, VIN (+5V)

Actually, you should install the soil moisture sensor where moisture is important. This could definitely be under the drip hose. The only important thing is the time delay, so that it doesn't switch off right away with the first drop.

The OSPi supplies the Raspberry Pi with power via the 24VAC power supply. Only with the old 1.43 version and the RPi 3 or 4 was the power supply too low, since version 1.5. But that's no longer a problem. Here you also had to connect the RPi power supply.

By the way, it doesn't work the other way around, so only the RPi power supply cannot supply the OSPi and the solenoid valves!