On 20 November 2014 14:29, Marius Liebenberg <mar...@mastercut.co.za> wrote: > Andy why were you disappointed with the position feedback. > Will it be ok on a slow moving bed? > Do you think a more powerful MCU will do the trick?
It was noisy and dithered a lot. The Arduino has to measure 2 voltages per measurement. To do it fast enough it had to be only 8 bits and the shortest sample time that the Arduino could handle. Even then the carrier was only 1kHz, whereas Resolvers normally work at at least 5kHz. So, two noisy values divided by each other = a very noisy result, which gives a noisy arctan and a lot of servo dither. Yes, a more powerful MCU would be better, and it so happens that Mesa and Pico sell exactly that all ready to go. Why will nobody believe me when I say that my experiment was rubbish? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
