SPWM inverter CODE
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This is the code for the Arduino SPWM inverter for sine wave output. Download the .zip file or copy+paste from below. Read comments in the code!





schematic Arduino SPWM



#include <avr/io.h>
#include <avr/interrupt.h>

// Look up tables with 200 entries each, normalised to have max value of 1600 which is the period of the PWM loaded into register ICR1.
int lookUp1[] = {
50 ,100 ,151 ,201 ,250 ,300 ,349 ,398 ,446 ,494 ,
542 ,589 ,635 ,681 ,726 ,771 ,814 ,857 ,899 ,940 ,
981 ,1020 ,1058 ,1095 ,1131 ,1166 ,1200 ,1233 ,1264 ,1294 ,
1323 ,1351 ,1377 ,1402 ,1426 ,1448 ,1468 ,1488 ,1505 ,1522 ,
1536 ,1550 ,1561 ,1572 ,1580 ,1587 ,1593 ,1597 ,1599 ,1600 ,
1599 ,1597 ,1593 ,1587 ,1580 ,1572 ,1561 ,1550 ,1536 ,1522 ,
1505 ,1488 ,1468 ,1448 ,1426 ,1402 ,1377 ,1351 ,1323 ,1294 ,
1264 ,1233 ,1200 ,1166 ,1131 ,1095 ,1058 ,1020 ,981 ,940 ,
899 ,857 ,814 ,771 ,726 ,681 ,635 ,589 ,542 ,494 ,
446 ,398 ,349 ,300 ,250 ,201 ,151 ,100 ,50 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0};

int lookUp2[] = {
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,0 ,
50 ,100 ,151 ,201 ,250 ,300 ,349 ,398 ,446 ,494 ,
542 ,589 ,635 ,681 ,726 ,771 ,814 ,857 ,899 ,940 ,
981 ,1020 ,1058 ,1095 ,1131 ,1166 ,1200 ,1233 ,1264 ,1294 ,
1323 ,1351 ,1377 ,1402 ,1426 ,1448 ,1468 ,1488 ,1505 ,1522 ,
1536 ,1550 ,1561 ,1572 ,1580 ,1587 ,1593 ,1597 ,1599 ,1600 ,
1599 ,1597 ,1593 ,1587 ,1580 ,1572 ,1561 ,1550 ,1536 ,1522 ,
1505 ,1488 ,1468 ,1448 ,1426 ,1402 ,1377 ,1351 ,1323 ,1294 ,
1264 ,1233 ,1200 ,1166 ,1131 ,1095 ,1058 ,1020 ,981 ,940 ,
899 ,857 ,814 ,771 ,726 ,681 ,635 ,589 ,542 ,494 ,
446 ,398 ,349 ,300 ,250 ,201 ,151 ,100 ,50 ,0};


void setup(){
    // Register initilisation, see datasheet for more detail.
    TCCR1A = 0b10100010;
       /*10 clear on match, set at BOTTOM for compA.
         10 clear on match, set at BOTTOM for compB.
         00
         10 WGM1 1:0 for waveform 15.
       */
    TCCR1B = 0b00011001;
       /*000
         11 WGM1 3:2 for waveform 15.
         001 no prescale on the counter.
       */
    TIMSK1 = 0b00000001;
       /*0000000
         1 TOV1 Flag interrupt enable. 
       */
    ICR1   = 1600;     // Period for 16MHz crystal, for a switching frequency of 100KHz for 200 subdevisions per 50Hz sin wave cycle.
    sei();             // Enable global interrupts.
    DDRB = 0b00000110; // Set PB1 and PB2 as outputs.
    pinMode(13,OUTPUT);
}

void loop(){; /*Do nothing . . . . forever!*/}

ISR(TIMER1_OVF_vect){
    static int num;
    // change duty-cycle every period.
    OCR1A = lookUp1[num];
    OCR1B = lookUp2[num];
    
    if(++num >= 200){ // Pre-increment num then check it's below 200.
       num = 0;       // Reset num.
     }
}













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SPWM code



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