84 lines
1.5 KiB
C++
84 lines
1.5 KiB
C++
bool fanControlEntered = 0 ;
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void setup () {
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Serial . begin (9600) ;
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// 122Hz @ 50% on pin 3 using T/C0
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pinMode ( 3 , OUTPUT ) ; // 0C0B is connected to pin 3
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TCCR0A =
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0 << COM0A1 |
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0 << COM0A0 |
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1 << COM0B1 |
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0 << COM0B0 |
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1 << WGM01 |
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1 << WGM00 ;
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TCCR0B =
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1 << WGM02 |
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1 << CS02 |
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0 << CS01 |
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1 << CS00 ;
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OCR0A = 127 ;
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OCR0B = 63 ;
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// 25kHz @ variable duty cycle on pins 9 and 10 using T/C1
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pinMode ( 9 , OUTPUT ) ; // 0C1A is connected to pin 9
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pinMode ( 10 , OUTPUT ) ; // 0C1B is connected to pin 10
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TCCR1A =
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1 << COM1A1 |
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0 << COM1A0 |
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1 << COM1B1 |
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0 << COM1B0 |
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0 << COM1C1 |
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0 << COM1C0 |
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1 << WGM11 |
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0 << WGM10 ;
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TCCR1B =
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1 << WGM13 |
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1 << WGM12 |
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0 << CS12 |
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1 << CS11 |
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0 << CS10 ;
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ICR1H = 0 ;
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ICR1L = 79 ;
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OCR1AH = 0 ;
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OCR1AL = 39 ;
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OCR1BH = 0 ;
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OCR1BL = 39 ;
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}
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void loop () {
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if ( Serial . available () ) {
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if (fanControlEntered) {
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int dutyCyclePercent = Serial . parseInt () ;
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int dutyCycle = map ( dutyCyclePercent , 0 , 100 , 0 , 79 ) ;
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OCR1AL = dutyCycle ;
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OCR1BL = dutyCycle ;
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Serial . read () ; // Consume newline
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Serial . print ("duty-cycle ") ;
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Serial . print (dutyCycle) ;
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Serial . print ('\n') ;
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} else {
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String input = Serial . readString () ;
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if ( input == "enter-fan-control" ) {
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fanControlEntered = 1 ;
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Serial . println ("success") ;
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} else {
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Serial . println ("error") ;
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}
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}
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}
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}
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