There are a few combined sensors out there like this one.
http://www.adafruit.com/products/385&zenid=3D1858fee8067021c742610fa2e71337=
5a

A bunch of online shops sell them.

Best,
John

On Sat, Jun 25, 2011 at 17:09, Mike Harrison <mike@whitewing.co.uk> wrote:

> On Sat, 25 Jun 2011 16:44:14 -0400, you wrote:
>
> >Hi all,
> >
> >I'm looking for a relatively cheap (~$10 for humidity sensor, ~$5 or les=
s
> >for temperature sensor) for my project.
> >
> >Right now, I'm looking at the following:
> >
> >Temperature: DS18B20 (
> >
> http://ca.mouser.com/ProductDetail/Maxim-Integrated-Products/DS18B20+/?qs=
=3DsGAEpiMZZMvbyeSUH4qH%2fLbikZ7SIep9
> >)
> >
> >Humidity: HIH-5031-001 (
> >
> http://ca.mouser.com/ProductDetail/Honeywell-Microswitch/HIH-5031-001/?qs=
=3DsGAEpiMZZMseu6oguAZpqee7rmuRi3v3z4pHD5zNNiU%3d
> >)
> >
> >Requirements:
> >- Low voltage (3.3V compatible).
> >- Easy to interface (digital bus outputs are nice, such as SPI, I2C,
> 1wire,
> >etc), I don't want to be measuring capacitance or frequency. I can work
> with
> >linear voltage measurement.
> >- Humidity range: 0-100% RH.
> >- Temperature range: nothing special, anything standard will most likely
> do.
> >- Cost: as mentioned above. I don't want to be spending $40 for a chip.
> >
> >Can anyone recommend better? Have any experience with a particular
> product?
>
> I looked at that recently & came back with  LM75 and HIH-503x as cheapest=
..
> NB price on HIH-503x varies a lot between distributors so worth shopping
> around
>
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