power and load one of the Blinkenlights movies. You can see a desktop
system running in
building is running the wires to each lamp. With some addi-
tional hacking, it is possible to use low-cost wireless links to
eliminate the thousands of meters of wire.
cast one frame of data 25 times per second. Each of the receiv-
ers would have a unique address and would look for its state
(either on or off) for that frame of data. At the end of the
transmission all of the receivers would make their state change.
Each receiver would need a strong signal from the transmitter
connected to the control PC. An easy way to accomplish this
would be to place the control PC and transmitter in front of
the building windows at street level, therefore ensuring line of
sight to each receiver. An overview of this idea is shown in
a nice application note on channel
coding (http://www.radiotronix.com/
an401.pdf). It outlines a simple and
effective method for encoding data
for a radio channel.