Step 1: Parts:
2 Rechargeable 1.5v batteries
Copper plumbing parts
Brass & copper wire
Copper mesh or beer can
Step 2: Battery:
Step 3: Circuit:
I really like the simplicity of this circuit and wish I had done a better job showing it off.
Step 4: Robot Shell:
Drill holes in the end cap for the eyes and in the body for arms, belly button, satellite pole and wires. I use a hand drill and go slow, starting with a small bit and stepping up bit size incrementally.
I made the mouth with a Dremel and a cutoff wheel, but a hacksaw would work fine.
If you're feeling fancy and/or have them on hand finish the holes with aluminum grommets. On some I just used rivets for eyes on others it's a grommet + rivet mix.
Step 5: Soldering Arms:
I went with a four finger hand approach because it was easier to use small V's of wire.
I like to pretty much get the arms and fingers into position at this point because If you didn't do a very good job soldering they will break off. It's easier to fix now without the electronics inside.
Step 6: Satellite:
If you have the fancy copper you still need a beer can. Turn the can over and gently work the copper mesh into the bottom, I used the handle end of a screwdriver. Once you have the shape cut the excess off with scissors.
Punch the hole in the center after you form the dish, if you do it before the hole will warp and spread.
I also solder some wires onto the led at this point. The led holders I used have a rubber cork that has to be on the led before soldering.
Step 7: Get Ready:
When I used the 9v cells I kept the batteries on the outside like a backpack, with the button cells I just stuffed them inside. Either way we need to get those leads ready, either though a hole in the neck if they will be on the outside, or out on the desk if they will be inside.
The LED wires need to be strung through into the interior.
The leads for the solar cell need to be put through the belly button, better too long than too short.
Step 8: Solder the Circuit:
Solder the components together.
After you have it soldered together cover the solar panel and make sure the led starts to blink. Tape everything up so the leads don't touch and fold it into a shape that is going to fit inside.
Step 9: Attach Solar:
Attach satellite dish to pole and position at a rakish angle.
Step 10: Put Your Head On:
Step 11: Write Your Message:
I used a semi-fine point silver paint pen. Leave most of the solar panel exposed so the batteries can charge.
Step 12: Start the Invasion:
You can play with the resistor value to determine how sensitive the solar panel is. With the 1M resistor it has to be pretty dark before the LED starts blinking. With a 100k resistor it will blink in a lit room but turn off in direct sunlight. It all depends on how sneaky you want your robot to be.