On Sat, Oct 30, 2010 at 08:58:17PM -0700, Kirk Wallace wrote: > I did learn that the XMega is not compatible with 5 Volt signals, so it > would be harder to use with a parallel port.
To drive a reasonable length of cable, I'd use an octal buffer or two. I don't have a part number off the top of my head, but NS, Texas, and the rest are all pretty certain to have 3.3v to 5v versions. > Also, it needs a different type of programmer. Ah, I'll have to look into that. > So, I'm back to looking at plain mega's. Sticking with plain megas is no great pain, since it's easy enough to make your own DAC. Just add an RC low pass filter on the output of a PWM channel, followed by an op-amp voltage follower. (OK, that's getting close to an integrator, so one could do that instead.) The PWM channels can run at high rates, so it's not hard to have reasonable responsiveness at the VFD control voltage, yet have enough RC time constant to smooth the output. So, yes, you don't need an Xmega. Erik -- If at first you don't succeed, try again. Then Quit. No use being a damn fool about it. - W.C. Fields ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
