Based on this input (at D2) arduino gives an active-high (H) output through D13 when soil is dry ... mositure bridges the probes through a low-resistance path (when soil is dry, resistance between the ...

At the most an Arduino output pin can supply 40 milliamps. That’s enough to drive an LED or a pager’s vibrating motor, but anything substantial will require some help. In order to drive larger ...

That is, it isn’t really connecting one output to 32 inputs ... For example, the switch resistance is nominally 4 ohms at room temperature. The switches that route the signals also have some ...