piece of wood
computer with Arduino software
4 resistors that go with the LED's (yes just 4)
some small COAX wire (isolated wire)
Step 2: Making the rig
Draw on a piece of wood a grid with the lines 12,5 mm apart. (12 or 13 or whatever will also do, but I did 12,5) Draw at least 4 lines horizontally and 4 lines vertically. (I did more, because you'll never know what plans I will have in the future) You will now have 16 crossings. Drill some 5 mm holes (if your LEDs are 5 mm) at the crossings of the lines. If you first drill small holes, the location of your holes will probably be more exact.
This plank with 16 holes will be the rig for your soldering.
Step 3: Bending the legs of the LEDs
First I bended the legs of 16 LED's. Hold the led upside-down diagonally, with the short leg in the upper left and the long leg in the lower right. Bend the cathode (short leg) to the left and the anode (long leg) down. So the flat part on the side of the LED wil be in the upper-left corner (the film and pictures will make this more clear I hope).
You can also bend 32 LEDs already if you are on a roll.
Bio:I'm a social-worker, working with 16 - 23 year-olds. I used to be a printer and I worked voluntarily in Romania for a couple of years. One day a week I have a toy-store in technical toys. I have this ...read more »