On 12/22/2013 2:53 AM, bdebru...@luminize.nl wrote: > > On 2013-12-22 04:25, Charles Steinkuehler wrote: >> >> 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.
That's definitely broken. IIRC, I saw values like that when absolutely nothing was connected to the analog input (not even a BeBoPr board with a disconnected thermistor). >> 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) This sure sounds like nothing is connected to the analog input the software is reading. Make sure you are using the proper configuration for your board (BeBoPr or BeBoPr-Bridge) as the analog inputs moved between versions. This could be all that's wrong. >> 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. You don't have to do anything but load the existing already compiled kernel module. It's fairly straight-forward. But I think your problem is with the input pin mappings. -- Charles Steinkuehler char...@steinkuehler.net
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