I'm having a difficult time going through all the examples and learning how to simply take an integer the user types in and then sends it to Arduino.

Basically I want is: Text that says "Input voltage: ", then the user types a number (would be best if it could handle floats/decimals). Then press a button like "enter" then it take that integer/float and send it in byte format to my microcontroller code in Arduino.

So user inputs "5", then hits "Enter", then it sends 00000101 (5 in binary as a byte) to my microcontroller. this is basically all I need. Thanks for any help!

here's an example of how to write to the serial port:

http://processing.org/reference/libraries/serial/Serial_write_.html

you can convert a string (user input) to byte[] (array) like this:

String s = "100.1";
byte[] b = s.getBytes();

F