Code for the freeze box can be found at www.bolas.com/usc/freezebox1.htm. Basic description is on the extended entry here.
this code works with the usb type basic stamp that is attached
' to the foamcore board with hacked remote for the ZML projectors
'
' basically, keys on the keyboard of the controlling computer send
' serial data to the stamp which will have the stamp execute a number
' of different effects.
'
' Basic Theory of Operation:
' the stamp used all 16 I/O pins as output.
'
' STEP ONE: The last two pins (14 AND 15)
' are wired to control a cmos switch on the stamp's protoboard which effectively
' 'push' the freeze button and the rgb1 button. The freeze button being used
' to freeze a frame of video into a projector, and the rgb1 button being used to
' set the video input to the projector to the RGB1 port - which also has the effect
' of undoing the freeze function. (note, if video sync is ever lost by any projector,
' even if the frame is frozen, the frozen frame is lost.
'
' STEP TWO: The first 14 pins (0 through 13)
' are wired to enable the output of the remote control to go to each of the 14
' projectors. They are wired as you would expect with pin 0 going to projector one
' which is the one closest to the zml entry door and pin 13 going to projector 14
' which is the one closest to the accessable door that leads into the game lab.
'
' So basically you need to 'enable' or 'open the channel' to the desired projectors by
' turning their respective pin high, and then you need to 'push the freeze button'.
'
' It is pretty simple, most of the code below was a late night hack to make some
'effects that I thought would go well with my presentation. In particular this code
' maps the 12345tgbvcxz keys to spatially correspond with the projectors in ZML. 1 is
' projector 1 and then it 'loops around' until the z key is projector 14. The code
' starts by resetting all the projectors, and then freezes them all except for the two center
' projectors. Then, if you hit one of the aformentioned keys, the video replicates itself
' moving from the center screen over to the left or right to the chosen screen. If you
' hit shift-key, then that screen has it's freeze button pushed once - so you need to do
' shift-key twice if you want to 're-freeze' the video. Finally, if you hit the 'a' key, the
' video loops around the room being frozen as it goes, except for the two center
' projectors. If you try to figure out why I coded it the way I did, and think that
' logic, simplicity, or elegance was involved, you will be thwarted in your attempts.
'
' I would recommned that you ignore all of my code and just try writing out to the ports
' as described here. The pause times below might be useful.
'
' mbolas november 2004
'
'