====== portIn ======

''u8 portIn (u16 portNumber)''
|portNumber : The port number from which to read | 
|returns the input state of 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).

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

</code>

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