NRF24L01 (MySensors) Arduino balcony garden irrigation controller
Most smart irrigation systems like normally closed rain sensors (ideal for irrigation controllers) have a sensor which allows them.
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Picture of Irrigation Controller
Raspberry Pi Irrigation Controller: 9 Steps (with Pictures)
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Yardeen Smart Watering Timer with Automatic Sprinkler System Drip Irrigation Controller Color Green
Hardware 101: Smart Irrigation Controllers - Gardenista