User Manual

Tamper switch (pin5):
:note Digital input voltage is 0-2.5 V max.
Without PCB pull-up resistor:
to receive a logical "0" on the pin, the voltage should be between 0-1.47 V;
to receive a logical "1" on the pin, the voltage should be between 1.48-2.5 V.
With PCB pull-up resistor:
to receive a logical "0" on the pin, the voltage should be between 0-1.34 V;
to receive a logical "1" on the pin, the voltage should be between 1.35-2.5 V.
Newer routerboards will have a pull-up resistor on the PCB (on the board) - 10k ohm. Older boards (the first released batch) may need an external pull-up
resistor.