u8 portIn (u16 portNumber)

Reads the input state of the given port, portNumber. If the voltage on the port is less than the module's Off Level, portIn returns 0 (Off). If the voltage on the port is greater the module's On Level, portIn returns 1 (On).

u8 i = portIn(20);    // Reads the input state of port 20 and stores the result in variable i

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