while (pulseIn(IR_PIN, HIGH) < start_bit);
Will wait until you get a pulse so you will not be moving your motor when you are waiting for a pulse.
You will need to interleave checking for pulses with updating your stepper for this to work.
HTH.
while (pulseIn(IR_PIN, HIGH) < start_bit);
Will wait until you get a pulse so you will not be moving your motor when you are waiting for a pulse.
You will need to interleave checking for pulses with updating your stepper for this to work.
HTH.