Added comments. Updated air sensor code to work with mickabrig7's design.

SerialOutput.cpp

@@ -4,6 +4,10 @@
 
 #include "SerialOutput.h"
 
+// Workaround for microcontrollers without USB functionality
+// use a serial line to talk to a UC with USB, which will then act as a USB peripheral
+// Only needed because I didn't receive my Atmega328p until late in the project
+
 void SerialOutput::sendKeyEvent(int key, bool pressed, bool doublePressed)
 {
 	builtPacket.data = 0;