On 22-12-2013 9:53, bdebru...@luminize.nl wrote: > > On 2013-12-22 04:25, Charles Steinkuehler wrote: >> On 12/21/2013 6:40 PM, Bas de Bruijn wrote: >>> Hi There, >>> >>> I try to run LinuxCNC on the BeagleBone Black, with a BeBoPr+ >>> (bridge) board which I acquired via Bas Laarhoven and arrived >>> yesterday. Goal is to run LinuxCNC with my delta printer. >>> >>> I have a strange behaviour though. The temperature readings bars in >>> axis which show the temperature from Extruder and Heated bed swing >>> wildly. >> Exactly what does "swing wildly" mean? There is quite a bit of noise >> when using the on-chip A/D converter on the BeagleBone, but for me it >> works out to around one degree Centigrade or so of noise. > the values in the temperature bars of Axis range from -7 to 30 changing > very rapidly. > >> If you're >> seeing significantly more than that, check your wiring. Make sure >> all >> connections are solid, route the thermistor wires (which should be >> twisted to reduce noise pickup) away from the heater and motor wires, >> etc. > I have connected 2 thermistors with short prototype wires. approx 5 cm > lomg. I have not yet added motors and stepper driver boards, nor heater. > Basically just to test the board and get comfortable with them and > LinuxCNC. > Removing the thermistor(s) does not make a difference in varying ADC > values, and I expected to see that the value would go to minus > something, indicating it's not connected. > > Maybe some clash regarding mapping of ADC pins? I'll take a closer look > at that. (any nudge if I'm taking the wrong approach will be > appreciated) > >> Alternately, you could use the TI ADC that Bas has provisions for on >> the >> BeBoPr (see his github wiki for details). I haven't tried this >> myself, >> but I have the kernel modules available and it is reported to work >> quit >> well. > I'll have a look at that, I'm comfortable with electronics and some > programming. Although I'm not an expert. Talking about kernel modules > gives me goosebumps and sets my knees to rattle :) There's a first thing > for everything.
Bas, the board I sent you has the ADS1015 and signal wires already installed. Have a look here: <https://github.com/modmaker/BeBoPr/wiki/Better-Analog-Inputs> Note that I haven't tested this with LinuxCNC myself. I suggest that you try it with the kernel module from Charles. This way you don't have to set up the entire compilation environment yourself. Besides loading the module, you'll probably need to modify (and compile) the device tree overlay. The wiki page contains more instructions. -- Bas > > > ------------------------------------------------------------------------------ > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application performance > affects their revenue. With AppDynamics, you get 100% visibility into your > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
