From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <2781f0205010307446e35f866@mail.gmail.com> Date: Mon, 3 Jan 2005 10:44:41 -0500 From: Joseph Stewart To: Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu> Subject: Re: [9fans] Twente '9con -- some photos In-Reply-To: <200501031518.j03FIMr13216@zamenhof.cs.utwente.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit References: <200412311822.iBVIMlJ10227@augusta.math.psu.edu> <41D90671.2040504@sitetronics.com> <2781f020501030618bf2a150@mail.gmail.com> <200501031518.j03FIMr13216@zamenhof.cs.utwente.nl> Topicbox-Message-UUID: 23847098-eace-11e9-9e20-41e7f4b1d025 How cool... and to think I was just being a smart a$$... :P On Mon, 03 Jan 2005 16:18:22 +0100, Axel Belinfante wrote: > > I'll bet cooling isn't a problem on this device, then... ;-) > > right. :-) > > on the device under discussion there is another device: > a grey box hidden behind the oven -- you can only see the > cables leading to it on e.g. > http://www.insultant.net/nl/2004/Twente9con/DSC00582.jpg. > The grey box is linked to the plan 9 system via a parellel port. > > The grey box houses a webcam (currently not connected, > it was used until we switched to non-transparent coffee pots) > and some electronics that has the parallel port connection. > > The big photo behind the sofa under the world map, e.g. in > http://www.insultant.net/nl/2004/Twente9con/DSC00585.JPG > http://www.cs.utwente.nl/~belinfan/Twente9con2004/Large0/0020.jpg > shows the insides of the grey box, and some of the people > responsible for its existence (student doing the work, supervisors). > > A coffee maker receives its power via this grey box. > The electronics can measure the power consumption > of the coffee maker in some rough steps: > - 0 watt (machine off) > - 100 watt (keep coffee warm) > - 2000 watt (prepare coffee) > This info is made available over the parallel port. > The electronics can also cut the power to the coffee maker > if the right command is send to the parallel port. > (to switch the coffee maker off if it has been on too long) > > There is a daemon on the plan 9 machine that looks at > the parallel port and polls for the coffee maker status, > and makes it available in a small fs. > > The red bar at the bottom of the screen in > http://www.insultant.net/nl/2004/Twente9con/DSC00581.JPG > is based on stats(1), it shows when coffee was being prepared. > It uses the parellport watching fs. > > The info used to be made available via the web > and via some client programs on the users' desktops > but is currently not completely operational. > Older info is at http://wwwhome.cs.utwente.nl/~slurp/ > > The system was developed under linux. When the system (disk) > broke, a while ago, I set it up again, and moved it to plan 9 - > it was a good pretext to get a plan 9 machine up and running > as 'hobby project'. By the time I was ready to tackle (port to plan 9) > the simple image processing software that took the webcam > picture and looked in it for evidence of 100%, 75%, 50%, 25%, > 10% of coffee, or no coffee, or no pot, the coffee maker was > replaced by one that uses non-transparent coffee pots > (and no longer has the small heater to keep coffee warm). > A bit later I upgraded the hardware, and the 'new' machine > no longer has the two parallel ports needed to connect > both quickcam and power consumption measuring hardware, > so the quickcam is not used currently. > > > Axel. > > > On Mon, 03 Jan 2005 09:46:41 +0100, Devon H. O'Dell > > wrote: > > > Dan Cross wrote: > > > > Joseph Stewart writes: > > > > > > > >>Thanks for the photos... I was wondering; in the photo DSC00582.JPG, > > > >>is the device the gentleman has his coffee cup on, is that some new > > > >>hardware Plan9 has been ported to? I'd sure like to hear some detail > > > >>on this! > > > > > > > > > > > > I don't know, but I'm pretty sure it's called a `table.' I don't think > > > > it'll run Plan 9. :-) > > > > > > > > - Dan C. > > > > > > I'm pretty sure it was a refrigerator, actually... ;) > -- Person who say it cannot be done should not interrupt person doing it. -- Old Scottish Proverb