January 2004
Intermediate to advanced
348 pages
13h 33m
English
Content preview from Hardware Hacking Projects for Geeks
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151
Chapter 8, How to Hack a Building-Size Display
the metal mesh with an open metal
crimp. Each crimped LED should
look something like Figure 8-5.
Mount each of the 144 LEDs in this
way over the surface of the wire
mesh, making sure that they all face
outward.
4. Wire the LED frame to the
LED drivers
It is now time to connect the LED drivers to each of the LEDs previously
mounted on the metal mesh frame. Measure the distance that the LED
frame will be from the control PC and LED driver circuit boards. Cut 19
pieces of CAT5 wire to this length, plus 10 feet.
Solder groups of 24 wires to a female DB25 connector according to Exhibit
M. This connector will mate with one of the female connectors on the LED
driver circuit boards. Solder the ground wire to one wire from the separate
CAT5 bundle. Since each bundle has eight wires, this bundle requires three
lengths of CAT5 wire. Grab one wire for ground from a shared-ground-
only CAT5 wire.
After all the wires have been sol-
dered to DB25 connectors, label
each bundle, and lay it out on the
floor next to the LEDs and wire
mesh. Solder each wire to the long
leg of each LED, and seal the LED
and wire in hot-melt glue according
to the diagram in Figure 8-6. You
may also want to place each LED
at a location where there is more
than one wire of the mesh to secure
things and
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.