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All other code leave as is, just inser those pieces of code

ISR(TIMER1_COMPA_vect)

{ proceed = true; }



put in the end of void setup()?

? noInterrupts(); // Set up Timer1 for interrupts every symbol period.

? TCCR1A = 0;

? TCNT1? = 0;

? TCCR1B = (1 << CS12) |

? ? ? ? ? ?(1 << CS10) |

? ? ? ? ? ?(1 << WGM12);

? TIMSK1 = (1 << OCIE1A);

? OCR1A = WSPR_CTC;

? interrupts();