Re: [DIYbio] Re: Making my own incubator inexpensively

So would that $10 RH + Temp, calibrated at the factory and giving
digital out, be sufficient for the "shared"/"hi-accuracy" temperature
probe?

On Wed, Apr 25, 2012 at 2:02 PM, John Griessen <john@industromatic.com> wrote:
> On 04/25/2012 12:21 PM, Nathan McCorkle wrote:
>>
>> But in chemistry reactions are directly related to temperature
>
>
> You can have a 0.1 deg C incubator.  It will have a $4+ bill of materials
> instead of $2.8+
> is all, and you  will need to calibrate it occasionally with at least a 0.05
> deg C accurate thermometer
> that could be shared in a research group and sent of to be calibrated
> against standards.
>
> With all that, it'll need a display for an added $1, or maybe a USB port for
> ??
>
> The STM32 with the smallest memory, only 16KB has USB (but no ethernet) and
> costs $1.50 in 1's
> so that would cost 1.75 with USB connector so the difference from our 50
> cent microcontroller
> is about +$1.25 for USB, or +$2.25 for USB and a display...  Parts costs of
> $5.25 or $6.25.
>
> for ethernet connected remote-control-easy
> incubator and web site bragging about itself, there's a $6.1 STM32 that
> would make the BOM go to
> $13.
>
> Ethernet's nice, but costs.  I think selling prices at 3X parts costs are
> usually
> workable to make a profit, so a non-ethernet-incubator could cost $6 to ship
> and $12 to buy one.
>
> Maybe you would treat them as disposable?
>
>
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--
Nathan McCorkle
Rochester Institute of Technology
College of Science, Biotechnology/Bioinformatics

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