Generate a sine wave using a PIC microcontroller

[asmboy]

All sine waves can be made with 90 deg of table.

0-90 positive count UP rom
90-0 positive down rom

The negative half cycle is created by output inversion
of the two sequences above
as you cross zero at the end of the second 1/4 cycle.

Learning to write your own program for the AD9833
takes just as much pic skill but requires so much less hardware and power
and leaves the PIC free to do useful work -
other than grind out a jittery low resolution CONST ROM table......

[Ttelmah]

And, be aware that using a 16bit DAC does not give you the corresponding quality on the output, unless everything about your board is _very_ carefully designed. For a couple of volts output, one bit on a 16bit DAC, is just 30uV, unless every feature of your design (particularly separation of digital and analog paths, and really good quality grounding), is really well done, you won't get even 'close' to 16bit performance.
It's amazing how 'poor' many supposedly 16bit systems actually 'are' when you put them on test....

[Mike Walne]

[temtronic]

gee, I wonder how 'good' the waveform has to be to run a 25Hz syncho 3Watt clock motor? I salvaged a 'time clock' unit from old factory here and 25Hz was the power frequency until early 50s when Canada went 60 Hz.

One of those interestng PICprojects still 'on the books' to do.....

Jay

[asmboy]