For our devices, you need to operate an output voltage of 1 or 0 from the RPI to turn things on.
For our devices, you need to operate an output voltage of 1 or 0 from the RPI to turn things on. Conversely, the sensors give the RPi an input voltage of 1 or 0, depending on whether it is wet or dry. Both of these functions require the use of the RPi’s GPIO pins.