Use the Arduino board from analog cable A0-A0, Vcc-5 v, Gnd-Gnd. The working principle is to compare both the rawang-pin resistance will be converted from A To D, from 0-100% By the time there are no measuring value is 0 if the humidity is lower than 30%, will go to work and then relay the relay to the pump and solenoid valve order, watering until the humidity up to 50%, it will stop, the water.
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