162
This is the A-head
Part II: More Hacking Techniques
You can see the wiring going into the back of the control
PC in
Figure 8-16
. Notice again that the cables are labeled
and that both hot-melt glue and duct tape are used to keep
the bundles together and prevent the delicate solder con-
nections from breaking.
6. Build relay boxes and connect the lamps
Each lamp requires a relay to switch it on and off. You
control these relays by the relay driver board constructed in Step 5.
You now need to build a relay box for each lamp according to the illustra-
tion in
Figure 8-17
. If you don't mind cutting up the cord to the light, go
with Option #1. Slice open the lamp cord, pull out one of the wires (either
black or white), and connect it across the two relay pins. If you want to keep
the light cords intact, go with Option #2 and add an outlet that has been
wired to the relay.
When you have completed this step, attach each lamp to its stand and place
it in front of a building window (see
Figure 8-18
). You may want to place a
Figure 8-16: ISA card cable bundles
1
3
4
5
Light relay box
option #1
Relay pin # (printed
on bottom of relay)
Plastic junction box
Cord from light
From relay driver
Light plug
1
3
4
5
Light relay box
option #2
Relay pin # (printed
on bottom of relay)
Plastic junction box
From relay driver
Dual outlet
Light plug
Figure 8-17: Relay box designs
Figure 8-18: Lamp in front of window