Re: [ProgSoc] Temperature of the Progsoc Room

[Anton Blanchard <anton@nospam.progsoc.uts.edu.au>]

> Best to store the samples in their raw form and do the processing
> as part of the display process. Firstly, you don't have to wait
> for results, secondly you can change your mind and try something else.
> Yeah, I do realise that if a lot of people want results then the
> processing load goes up dramatically but how likely is that?

Good idea, however I am lazy by nature and it works at the moment.
I also plan to cleaning up the tempd RPC server one day.

btw processing load is not an issue since the "today" cgi calls gnuplot
on the fly to give an up to the second graph.

> > The method of analog to digital conversion used by Tim is interesting.
> > Since there is no ADC on the micro, it measures the discharge time of a
> > capacitor, timing until the voltage is the same as the analog voltage.
> > It then has a lookup table to convert the time into a voltage.

> This is a fairly common method for ADC when the input signal is slow.
> Time is the easiest thing to measure by computer. Did you callibrate it
> next to a mercury bulb or just calibrate it against your calculated
> discharge times?

Tim did some rough calibration. I could take it to work and calibrate it
but that sounds like overkill :)

Anton
-- 
Anton Blanchard                         anton@nospam.progsoc.uts.edu.au
Computer Systems Engineering Student    anton@nospam.lister.flex.com.au
University of Technology                http://www.progsoc.uts.edu.au/~anton/
Sydney, Australia

You pregnant baboon bellied space cookie.
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