As shown, the controller consists of a buck rectifier, a switch control power supply and an oscillating, control circuit. The humidity sensor in the figure is two graphite rods with copper caps. When the soil is dry, the conductivity between the two graphite rods is low, and the resistance is large. Nantong Double Star Automation Equipment Co., Ltd. , https://www.nt-doublestar.com
RF cable can be customized for other specifications 