[phoenix-project] online phoenix
- From: Arani Chakravarti <arani_chakravarti@xxxxxxxxxxx>
- To: phoenix-project@xxxxxxxxxxxxx
- Date: Fri, 14 Dec 2007 08:56:07 +0000 (GMT)
Dear Ajith,
This is great. I can see that quite a few people want to be able
to change the capacitance, etc. Probably one relatively simple
way would be to have a small bank of capacitors (and resistors
maybe) which can be connected in variable configurations like
a post-office box (remember the wonderful school days?) with
the help of cheap MOSFET switches like the CD4066. These
could, in turn be controlled with the help of the digital outputs
driving comparators. If the resistance values are quite large,
the on-resistances of the switches would not matter much.
Then the game would be relatively more interesting. However,
there was one comment regarding how one is to know whether
the experiment was really being done or it was just a case
of solving the charging equation and displaying the result!
Welllll ......... `to cheat or not to cheat'.....
I am currently developing an user-space daemon to run
phoenix, without using the kernel module. I use the MPI
libraries to set up the whole system as a cluster (both server
and client are the same machines at present, but any number
could be interfaced into one supercomputing cluster). The DAC
ADC and digital input parts are ready but the digital outputs
are yet to be set up. To access `ioperm', I run the programme
through `sudo' and use `setuid' from inside the daemon
programme to release the privileged root access just after
the `ioperm' instruction.
Arani
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