On Wed, 6 Jun 2012, andy pugh wrote:
Date: Wed, 6 Jun 2012 11:01:46 +0100
From: andy pugh <bodge...@gmail.com>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] OT: and Soapbox: 3D Printer Mods?
On 4 June 2012 19:18, Dave <e...@dc9.tzo.com> wrote:
Makes sense. ?Thermocouples are the standard on all of the commercial
plastic extruders I have worked on.
By the time you do linearization of a TC and cold junction compensation,
you might was well buy a cheap PID controller
As an alternative (though probably more expensive than most home
FDN-ers would like to pay) is this $20 chip which does all the work
then talks SPI.
http://uk.rs-online.com/web/p/temperature-sensor/6987118/
LinuxCNC can talk SPI through Mesa cards.
The temperture control is slow enough that parallel port bit banging
would be fine for a SPI interface (I think the other Wallace has a comp for
this)
--
atp
If you can't fix it, you don't own it.
http://www.ifixit.com/Manifesto
Peter Wallace
Mesa Electronics
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