Automatic watering station: module will check the humidity of the soil and water the plants when soil is too dry.For this project you need:
- Arduino (I used Arduino Nano, but any arduino will do)
- Soil humidity sensor + amplifier
- Relay module
- Low pressure water pump (I used one made for aquariums)
- Power sources (5v for arduino + 12v for water pump)
- Cables (to connect everything together)”

Link

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