Arduino Soil Moisture relay controller

Arduino example to control a relay based on moisture values. The basis for a smart garden irrigation system.

Wiring relay

• Connect VCC to 3.3v
• Connect ground to ground
• Connect data pin to pin D4/GPIO2

Wiring soil moisture sensor

• Connect VCC to 3.3v
• Connect ground to ground
• Connect data pin to AO analog pin.

Wire your pump to the relay. The pump will start pumping water as soon as the soil moisture sensor detects too less water.