<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div><span style="color: rgb(69, 69, 69); font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 12px;">I'm going to disagree with sing opto-isolators. They are slow (non-squarewave forming, but very rounded waves) and very noisy (interference with PWM signals, and mis-triggers for other I/O).</span><span><br></span></div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;">Scott,</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color:
rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;">I appreciate the feedback. I admit that my methods may be old and I am always looking for some newer techniques, I look forward to reviewing this solution you mentioned. I have been using the opto-isolators for over a decade and will state they work quite well without any significant noise or mis-triggers, but I do not use them in high frequency at all, so I just may not have seen those limitations.</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;">This is why I love these forums, everyone has a different approach and we can all learn.</div><div style="color: rgb(0, 0, 0);
font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;">Thanks,</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: arial, helvetica, sans-serif; background-color: transparent; font-style: normal;">John Vaughters</div> </div></body></html>