On 15.01.14 15:08, Toby Corkindale wrote:
> The Beaglebones have had good manufacturer support for Linux, and
> stable distributions. (Which is something the cheaper Chinese boards
> tend to be lacking in)
>
> Looks like the rated temperature for the board is only up to 50°C, but
> someone has reported having it work fine at 70..
> https://groups.google.com/forum/#!topic/beagleboard/p_DK-HE1Ds4
Yup, but the Arrhenius equation reminds us that every 10°C rise in
temperature halves the lifetime of the board's components.
(I.e. Add 40°C => 1/16 lifetime)
So I'd still add a Peltier-effect cooler to drop 25°C when things warm
up. It runs off 12v dc, around 4A (or was it 6A tops for the bigger
one?) (Cascading 3 on top of the first could take off something less
than 50°C, with a good sized heatsink on top, but now we're up around
200W for cooling, IIRC.)
If the beagleboard drives the cooler through a power FET, PWM could
provide proportional control. (The A/D converter is a little bit noisy,
I've read, but much more than good enough for a thermostat.)
Erik
--
The future is a race between education and catastrophe.
- H. G. Wells
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