On Sun, 2010-12-05 at 09:44 +0200, Slavko Kocjancic wrote: ... snip > That's funn... If you already have watchdog (hardware) to keep ATtiny > RESET good why do you need that MCU at all?!? Seems nonsense for me.
I think because the MCU is used to validate EMC2 before powering up the dangerous bits of the machine. The MCU's internal watchdog validates the MCU itself(?), which is a separate function. I need to read the MCU manual to see what features come with the using the watchdog. I suppose EMC2 could be used to validate the MCU, but things are getting complicated. > I don't hate MCU's. I use it a lot. But in places where they (I think) > are needed. And Watchdog of that kind is surely not good idea. > But someone on forum say's something about PLL. That can be good idea > too. There are some tondecoder PLL's like NE567. Cheap 8 pin DIL chip > and two resistor's and one cap can solve that problem perfectly. You > just need to do software chargepump at servo rate (1ms for example) and > got 500Hz output for PLL. That's seems ideal too for me. Can't triger on > wrong pulses and react fast. > > Slavko. The reason I am leaning toward the ATtiny is that I have a guess in how to make it work and the parts cost and count is the same or less than other methods I've looked at. Most methods have merit. If I take the time to learn how an NE567 works (likely), I may go with that. It would save me having to figure out the software. Ideally, I suppose I should build and test a few different designs, which would most likely result in more changes. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ What happens now with your Lotus Notes apps - do you make another costly upgrade, or settle for being marooned without product support? Time to move off Lotus Notes and onto the cloud with Force.com, apps are easier to build, use, and manage than apps on traditional platforms. Sign up for the Lotus Notes Migration Kit to learn more. http://p.sf.net/sfu/salesforce-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
