Instructables
Picture of Lego Motor Arduino Interface
I wanted to add a Microcontroller to my Technic lego, but I can't afford Mindstorms or NXT right now, so why not add my Arduino?

I wanted a solution to adding motors that is non invasive, does not destroy any "prime" parts, and simple to use. This is what I came up with.

You will need for each interface:

1 2x2 tall Lego brick, any color
1 2 position screw terminal block
about 2" solid core wire, 22-24 AWG
Solder

Tools:
Soldering Iron
Drill
Small drill bit or finishing nail
Electrical Tape
Diagonal cutting pliers, smaller is better
Wire Strippers
Fine tip sharpie
Exacto Knife

 
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Step 1: Mark and Drill holes

Picture of Mark and Drill holes
IMG_1397.JPG
Measure up the holes on one side of the brick by holding the screw terminal and mark holes as shown. Drill holes with small nail or drill bit. Drill holes in top 2 corresponding studs as well. You want these to line up as close as possible, but centered in the studs is good.

Step 2: Add conductors and solder

Picture of Add conductors and solder

Strip 1" of wire for each stud/terminal. Bend an 1/8" down and insert through the hole in the stud. Insert the terminal strip on the side of the brick and tape in place. I found it easiest to put the wire in the hole, and then attach a power bus brick on the top, so I can test to make sure it makes connection. Solder the wire to the screw terminal contact and repeat for both studs. Make sure the wire points out at a 45 degree angle to the outside to ensure it makes contact with the electric bricks. Careful not to muck up the inside of the brick with the hot iron, if you do, just clean out the excess with the exacto knife.
shaggs314 years ago
looks neat I'll have to come over and see what it does. The 17th works for us we will bring something.