Hey Glenn,

The pressure sensor board that we ordered has 7 leads to it (it's 3.3V
plus a fairly standard SPI interface. So we'll use a 3.3V
microcontroller to talk to (it'll be the first test of our LPC2148), and
then send the data over a standard UART to a PC so that we can process
the data. So that would mean 3 wires (3.3V, uart, gnd) going into the jar.

Another nice feature would be to read in a voltage or whatnot from the
pressure sensor - is it electronic? can it output a signal? If not, no
big deal, we'll do it by hand, but it'd be cool to automate the data



>> I really don't think we care past 10^-3, frankly, so this should go
>> fast.
> I'll get a vacuum gage calibrated for us to use.
>> So there are view windows, but are there access ports? Or will we
>> need to set up wireless broadcast if we want to have data streaming out
>> of the bell jar?
>> And what's a flange point?
> Yes; The "jar" is a cylindrical stainless steel tank (around 0.75m dia x
> 1m high) that lifts apart in the center (along the dia). There are
> stainless steel flange "ports" (which are a standardized size) around it
> in places that can give you access to the inside. For example one port
> passes the electrical connections for a crystal sensor used with a thin
> film deposition gage. Any connections will need some kind of connector
> plate to mount onto one of the (flange) ports. Obviously with a Physics
> lab comes a machine shop! We can make one if it does not exist! :) Erik
> probably has some connector plates already made up somewhere. I'll ask
> about that too.
> It would make sense to pass 100BaseT (through a connector plate) to talk
> to the thing, but WiFi might also work. It would be interesting to try.
> Maybe we could put an antenna near one of the view ports.

Andrew Greenberg

Portland State Aerospace Society (http://psas.pdx.edu/)
[EMAIL PROTECTED]  P: 503.788.1343  C: 503.708.7711

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