User Manual

30
Switch
It is the signal line that connects to the switch (button) on Witty Pi Mini. If you want to
connect your own (2-lead) switch, just wire the two leads to Switch and GND pads.
Alternatively, if you wish to trigger Witty Pi Mini with external signal, you can use a
N-channel MOSFET to achieve this:
The signal should be a positive pulse, and the pulse length should be longer than
300ms. Processing a pulse will be equal to taping the switch once, so it will turn on
your Raspberry Pi if your Pi is off, or turn off your Raspberry Pi if your Pi is on.
GND
It is the ground of the circuit board and all voltages are based on it.
LED
It is connected to the anode of the white LED. You can use this test pad to connect
your own LED, but don’t forget to put a 1K resistor in serial.