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On the camera, there's a hacked-up PoE cable that does the following:

1 wht/org ethernet
2 org/wht ethernet
3 wht/grn ethernet
4 blu/wht GND
5 wht/blu Digital Input +
6 grn/wht ethernet
7 wht/brn Relay Output
8 brn/wht +12V

In the box above the door: Ethernet pins pass through to Ethernet input (into which is plugged the feed from the back of the space.) GND from power input goes to GND from camera, also to LED cathode and SSR negative. +12 from power input goes to +12 from camera, also to switch contact. Relay Output from camera goes to LED anode and SSR positive. Digtal Input + from camera goes to switch contact. SSR isn't currently connected; signals are on orange wires, shrinkwrapped to prevent shorts in the time being.

(To accommodate a future local OPEN sign, provision has been made for connecting the big solid-state relay, which can switch anything we could throw at it.)


The most important part of all this! Camera documentation: [1]

Proof-of-concept batch file:

del getdi.cgi
wget --user=port --password=port http://i3detroit.dyndns.org:5000/cgi-bin/getdi.cgi
find "DI=L" <getdi.cgi
echo %errorlevel%
if %errorlevel% EQU 0 wget --user=port --password=port http://i3detroit.dyndns.org:5000/cgi-bin/setdo.cgi?do=l --output-document=NUL
rem This turns the LED off when the switch is down.
find "DI=H" <getdi.cgi
echo %errorlevel%
if %errorlevel% EQU 0 wget --user=port --password=port http://i3detroit.dyndns.org:5000/cgi-bin/setdo.cgi?do=h --output-document=NUL
rem This turns the LED on when the switch is up. 
sleep 1
goto top

Updated batch file, this is the one currently running on nate's desktop at home:

rem set currentstate=off
set camerahost=i3detroit.dyndns.org:5000
set camerauser=port
set camerapass=port
set twitteruser=contact@i3detroit.com
set twitterpass=redacted-from-wiki

del getdi.cgi
wget --user=%camerauser% --password=%camerapass% http://%camerahost%/cgi-bin/getdi.cgi
find "DI=H" <getdi.cgi
echo %errorlevel%
if %errorlevel% EQU 0 goto itson
find "DI=L" <getdi.cgi
echo %errorlevel%
if %errorlevel% EQU 0 goto itsoff

sleep 10
goto begin

echo It's on!
if "%currentstate%" EQU "on" goto loop
set currentstate=on
echo Switch set to ON state, %time% %date% >> log
wget --user=%camerauser% --password=%camerapass% http://%camerahost%/cgi-bin/setdo.cgi?do=h --output-document=NUL
rem wget --user=%twitteruser% --password=%twitterpass% --post-data="status=The space is OPEN FOR GUESTS as of %time%, please drop in!" http://twitter.com/statuses/update.xml --output-document=NUL
del video.jpg
wget --user=%camerauser% --password=%camerapass% http://%camerahost%/cgi-bin/video.jpg
curl --form username=%twitteruser% --form password=%twitterpass% --form media=@video.jpg --form-string "message=The space is OPEN FOR GUESTS, and here's who flipped the switch! Drop in?" http://twitpic.com/api/uploadAndPost
goto loop

echo It's off!
if "%currentstate%" EQU "off" goto loop
set currentstate=off
echo Switch set to OFF state, %time% %date% >> log
wget --user=%twitteruser% --password=%twitterpass% --post-data="status=The space is closed as of %time% %date%" http://twitter.com/statuses/update.xml --output-document=NUL
wget --user=%camerauser% --password=%camerapass% http://%camerahost%/cgi-bin/setdo.cgi?do=l --output-document=NUL
goto loop