This one sounds worse, but is non-blocking
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void play_note(long tone, long start, long now) { | |
long gap = now - start; | |
long step = gap / tone; | |
boolean high = (step % 2 == 0); | |
if (high) { digitalWrite(speaker_pin, HIGH); } | |
else { digitalWrite(speaker_pin,LOW); } | |
} |
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