Step 6: Wire up the 8 LED Strands
- it’s cheap
- there are no toxic fumes
- there is no risk of overheating and destroying LED’s
- it’s easy to undo, so repairs are easier
- it’s relatively quick to do
- it’s as reliable as soldering – perhaps more reliable, since there’s no risk of cold-soldered joints
- the wire is so thin that it can be threaded into the gaps between the foam matrix pieces
The schematic diagram for a common anode 8x8 RGB matrix is depicted above. We are going to wire our matrix, composed of 5mm LED's, in the same fashion.
We need a total of 8 strands of 8 LED's. Each pair of LED's is connected with three 4" pieces of wire. The anode is the lead which is slightly longer. In my photo above, the pins, from left to right, are Blue/Green/Anode/Red.
The red wires connect the red channel, the white wires the green channel, and the blue wires the blue channel. 4" may sound a bit long, since the cells are only 2" wide, but I when you account for stripping the wire on both ends, and leaving enough slack to manipulate the LED's in while assembling the grid, 4" is a good length. You will need 49 4" pieces of wire for each color - 147 pieces total. While working on this step, I discovered a few things which make for a quicker and cleaner job:
- orient the pins of your LED's the same way while wiring them (e.g. blue pin on the left, red pin on the right)
- connect the R/G/B wires between each pair of LED's before moving to the next LED. At first, I was connecting all the reds, then all the blues, then all the greens. This method was a bit messier.
- spread the pins apart a bit before wrapping. Otherwise, the wrapping tool will get caught on the adjacent wraps as you try to insert it
- start the first wrap about halfway into each lead
- when connecting the second wire on each lead, just stack the wrap against the previous wrap.