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Jan 26, 2012, 07:12 am
I've come across an interesting conundrum. I'm using the tone() function to, of course, generate a tone. I've also made a 2nd order Sallen-Key filter to clean up the harmonics a bit and get a bit closer to a sinusoidal wave. I've tested the filter against a square wave generator and it seemed to do the trick very well, however when I hook the filter up to the arduino tone generator, the filter output still remains a square. The cutoff freq is set to about 50 Hz and the testing frequency is 200 Hz. All Caps are 0.22 uF and Resistors are 15k. Am I missing a key piece of knowledge in the arduino's tone generation?
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Jan 26, 2012, 07:38 am
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Designing & building electrical circuits for over 25 years. Screw Shield for Mega/Due/Uno, Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at my website.
Jan 27, 2012, 08:01 am
Ah I figured it out, the arduino output was saturating the op amp. How embarassing...