On 5/20/08, Forrest W Christian <forrestc@imach.com> wrote:
> I need a low cost (in qty) way to sense room temperature.

1N4148


 I tagged this
> as [PIC] as I'm looking for a solution which is low-cost when
> considering interfacing to the PIC processor.
>
> Right now I'm bit banging a DS18S20 (had a library) on a PIC18F part for
> development purposes, but this is a bit pricey and sometimes hard to find.
>
> My goals are as follows:
>
> 1) 3.3V (this is a biggy-it seems some of the more popular sensors need 5V+)
>
> 2) Cheap and easily obtainable.  Mouser stocking it is a plus.
>
> 3) No calibration required to obtain accuracy within a few degrees
> (solder and be done).

poor and pretentious...
:)

>
> 4) Ok to use about any resource on the PIC.  I have ADC ins and spare
> I/O pins available.  The SPI interface is somewhat tied up with a couple
> of other devices which are fairly high-bandwidth, but I could do a SPI
> sensor if need be.  I2C not so much, although I guess I could bit-bang
> i2c as well.
>
> 5) Through hole packaging.  No SMD-only parts.
>
> 6) -40*F to well over 120*F.  The idea is to monitor likely temperature
> ranges for outdoor enclosures.
>
> Ideas?
>
> -forrest
>
>
>
>
>
>
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