On 8/9/2013 8:59 AM, Andrew wrote:
> Hello,
> 
> I recently got a 3D printing head with K type thermocouple off ebay.
> There are two kinds of converters for these thermocouples:
> - AD595 with analog output 10mV/C,
>  - MAX 31855 with SPI output
> http://datasheets.maximintegrated.com/en/ds/MAX31855.pdf
> The first type needs ADC (which I already have in 7i73 as the last resort,
> but I would not like to use it for 3D printer).
> Thus the SPI type looks preferable. But is it compatible with MESA sserial?
> Or (even better) with Beaglebone?

If the SPI pins are free you can probably use it pretty easily with the
BeagleBone.  If you want to talk to it via real-time HAL you'll have to
write a low-level SPI driver to talk directly to the hardware, but
that's probably not necessary.

I use the on-board ADC for my thermistors, and have a python script that
uses the Linux kernel driver for the ADC to grab the value and then
convert it into a temperature that is injected into HAL.  It's not real
fast or hard-real-time, but that doesn't matter much for a temperature
control.

There are kernel drivers available for SPI as well, but I haven't tried
to use them.  IIRC the guy making the Replicape uses the Linux SPI
drivers, so there's probably something on his blog about getting it
working to get you started...yep, here you go:

http://hipstercircuits.com/enable-spi-with-device-tree-on-beaglebone-black-copy-paste/

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

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