Code Arduino Example SPWM Inverter Frequency

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SPWM inverter CODE Help me by sharing this post Share

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!

SPWM inverter code (23/03/2019) GO BACK #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. } } GO BACK

SPWM code

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