how to generate 50to 60 hz sine wave from pwm

Question

I Want to know that how to generate the 50 -60 hz frequency by using pwm . If any body have any idea about then please tell me .

kas.lewis · Answer

https://www.youtube.com/watch?v=qVeERT4nyz8 This may be a helpful and informative video, I sure found it to be so. Kas

valiza · Answer

Can't just give you the full code but I will give you hints. Configure TimerCounter1 (TCCR1A and TCCR1B) to give a PWM of >6khz. Make a array of sine wave values with the resolution you want (100 in this case) // In main.c uint8_t SinTable[100]; for (i=0;i<100;i++) { SinTable[i]= sin(6.28/100)* 127+127 ; // 127 is the middle value, 127 is the amplitude, 6.28 for full "circle" } Feed them with a second timer to the pwm configured for 50hz * 100 values (5000hz) interrupt or 60hz*100 for 60hz. Like so. ISR(timer0_ovf_vect) { static uint8_t actualPos=0; OCR1A=SinTable[actualPos++]; if (actualPos==100) actualPos=0; } Want to change the frequency from 50 to 60 dinamically? Timer0 should be configured as CTC mode, change the ICR0 value to set another TOP or OCR0 if you configured CTC with OCR0 as top. And calculate it. ICR0 = (F_CPU / ( (desiredFrequency*100) * configured_prescaler)) / 2 ; // IT IS DIVIDED BY TWO BECAUSE IT IS IN CTC MODE. Hope it helps probably not, Have a nice day!

how to generate 50to 60 hz sine wave from pwm

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