[SOLVED] how to generate sine look up table for spwm generation by arduino uno atemga328?

[mobinmk]

hi frnds,

i got sine look up table from internet.

PROGMEM prog_uchar sine256[] =
{
127,130,133,136,139,143,146,149,152,155,158,161,164,167,170,173,176,178,181,184,187,190,192,195,198,200,203,205,208,210,
212,215,217,219,221,223,225,227,229,231,233,234,236,238,239,240,242,243,244,245,247,248,249,249,250,251,252,252,253,
253,253,254,254,254,254,254,254,254,253,253,253,252,252,251,250,249,249,248,247,245,244,243,242,240,239,238,236,234,
233,231,229,227,225,223,221,219,217,215,212,210,208,205,203,200,198,195,192,190,187,184,181,178,176,173,170,167,164,
161,158,155,152,149,146,143,139,136,133,130,127,124,121,118,115,111,108,105,102,99,96,93,90,87,84,81,78,76,73,70,67,64,
62,59,56,54,51,49,46,44,42,39,37,35,33,31,29,27,25,23,21,20,18,16,15,14,12,11,10,9,7,6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,
2,3,4,5,5,6,7,9,10,11,12,14,15,16,18,20,21,23,25,27,29,31,33,35,37,39,42,44,46,49,51,54,56,59,62,64,67,70,73,76,78,81,84,87,
90,93,96,99,102,105,108,111,115,118,121,124

};

how to get these 256 values,??
any calculation.??

i got smart sine wave app and make sine look up table, but its value is differnt.

],6,5,5,4,3,2,2,1,1,1,0,0,0,0,0,0,0,1,1,1,2,
2,3,4,5,5,6,
[/QUOTE

i think these values for dead time

 

[Dinuwilson]

Where you are going to use this? For an AC invereter

 

[FvM]

The table shows a full sine period in 8-Bit "straight binary" coding.

For some reason, it only spans the range from 0 (sine minimum) to 254 (maximum) instead of 255. I guess this has to do with PWM generator properties.

Basically you can code a sine table in any numerical format of your choice, everything depends on the intended usage.

 

[mobinmk]

The table shows a full sine period in 8-Bit "straight binary" coding.

For some reason, it only spans the range from 0 (sine minimum) to 254 (maximum) instead of 255. I guess this has to do with PWM generator properties.

Basically you can code a sine table in any numerical format of your choice, everything depends on the intended usage.

Thnks Fvm

would you mind to review this thread

https://www.edaboard.com/threads/332423/

 

[mobinmk]

The table shows a full sine period in 8-Bit "straight binary" coding.

For some reason, it only spans the range from 0 (sine minimum) to 254 (maximum) instead of 255. I guess this has to do with PWM generator properties.

Basically you can code a sine table in any numerical format of your choice, everything depends on the intended usage.

what is the duty cycle of this spwm signal ??

is it 100% ??

 

[mobinmk]

atlast i got it.

its maximum amplitude is 254.

this value is got from lookuptable calculator

https://www.daycounter.com/Calculators/Sine-Generator-Calculator.phtml