IR LED Pin
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Orange-Murker commented
IR output pin for ATmega328 (Arduino Pro Micro) should be 3 as the code states instead of 9 on the schematics. I tested PIN 3 and it outputs the signal.
// Arduino Duemilanove, Diecimila, LilyPad, Mini, Fio, Nano, etc
// ATmega48, ATmega88, ATmega168, ATmega328
#else
//#define IR_USE_TIMER1 // tx = pin 9
#define IR_USE_TIMER2 // tx = pin 3
#endif