Good point - I guess another advantage of the LM35's would be that
you can easily hang a DVM on them and actually 'see' what temperature
they are reading while seting up / calibrating the unit........
Now where did I put those LM35's ....?
Thanks for that - I'll give them a try....
Thanks for the comments
On 17 Sep 2004 15:17:52 -0700, firstname.lastname@example.org (manuka) wrote:
I've used computers & microcontrollers all my working life - but was
avoiding the temptation to use a sledgehammer to crack this particular
I do have a couple of the STAMP micros sitting around here - I guess
I could press one of those into service - but I was looking for a
I think, for starters, it'll be the 2 x LM35 sensors and an op-amp to
do the comparating - I have a built-up circuit that's working with
1N4001's as sensors - and swapping the diodes for the LM35's is as
quick and simple as remembering where I put the little beasties <g>
I'm sure that I'll get into 'microcontrollers around the house' before
too long - but, just now, with winter approaching, there are a couple
of 'more important' jobs to be completed (or so I'm told <g>)....
I take it you are a 'PICAXE' enthusiast ?
I keep seeing reference to these little microcontrollers in the Ham
radio magazines - but, so far, have resisted the urge to actually use
any of them in projects..... have just spent a few minutes browsing
the revolution website - these chips really are cheap, aren't they ?
...when I used to get paid for writing software the nearest thing we
had to a PIC was a largish boards with a Texas 9900 (or 99000 in later
years) and a bundle of support chips - programmed in assembler (which
I always found to be a bit of a pain!)
I understand that the modern chips can be programmed in high-level
languages - this might make it seem less of a 'chore' !
Getting lazy in my old age <g>
Thanks again for the suggestions