On Thu, 24 Aug 2006 14:48:12 +0200, Herbert E. Plett <
cachureos@...>
wrote:
>
> why so much complication?
> hardware is dead simple using a 1-wire interface from Dallas-Maxim.
> thermocouple feeds directly into an ADC (DS2761) that directly digitizes
> with a
> resolution of 15uV, measures digitally its own temperature and connects
> to a uP
> via one pin (and ground). also has a 2-5V ADC that can be fed directly
> from a
> pot (ie, setpoint).
> so, all is needed is this chip
> ( http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3468 ) plus a microP (I
> use
> Atmel Tiny), plus an opto-triac/triac pair or a solid state relay and a
> few
> passives, switches and a pot with a large knob.
> the process is all digital and the micro has the chance (responsibility)
> to
> implement whatever algorithm fits (from on-off to self adjusting) plus
> any
> bells and whistles (LCD display, serial logging, profile, etc).
> BTW, it DOES fit on a 1" x 2" board (exclusive of power and relay).
> I kept following this discussion in the hope somebody would come up with
> a two
> chip reasonable analog solution, but no, no such... (at least yet)
I bet you can't do it under 20eur either...
ST