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. 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. 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. -- Charles Steinkuehler char...@steinkuehler.net
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