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My new son in law will be traveling a great distance and spending his first Christmas with us. To celebrate, I thought I would make one of...
You will need a solar powered mini-car (thinkgeek.com). Carefully drill a 1/16 inch hole in the side.
I cut a 12 inch by 12 inch piece of 1/4 inch plywood to match the top of the package I'm wrapping.
I cut four 1 1/2 inch by 1 1/2 inch blocks of wood. I cut them 1/12 inches long (cubes).
Cut a 3 inch long piece of PVC pipe (1 7/8 inch outside diameter). This will be used to hold the motion sensor and the speaker (makes the sound much...
Select a place to mount the PVC tube. It must leave room for the mini-car to operate.
Drill a 1 7/8 inch diameter hole for the PVC pipe.
Drill a 7/8 inch hole in the PVC pipe (near an end) for the motion sensor.
Glue the blocks in the corners of the plywood.
Fasten (with two small wood screws) the battery holder (3 AAA unit) to one of the corners.
Drill a hole and mount the on/off toggle switch.
Drill a 1/4 inch hole behind the PVC tube hole. This will be used to run wires, so make sure it is on the side that will be least obvious when the p...
Drill a 1/16 inch hole for a paperclip. The paperclip will go through the wood base and the upright portion of the clip will become the "pole" in th...
This is the bottom of the base. Epoxy the paperclip in place; otherwise, it will probably fall out.
Fasten a tether to the mini-car. My tether is about 3 inches long and it is made of #32 magnet wire.
Be certain that the car's front wheels are turned for the tightest possible circle. Place a light (I used a 100 watt halogen flood) above the ...
Attach the positive wire (red) from the battery holder to the switch (1 on the schematic).
Obtain a Parallax motion sensor (from Radio Shack or Parallax.com). Connect a red wire wrap wire to the positive terminal (tie a small knot in the o...
I stuffed paper towel bits behind the motion sensor until it was held in place (this is just Christmas wrapping).
First, attach a 9 volt battery to the recording module and record your message "Step away from the package!" Speak loudly and very close to the micr...
Add about 8 inches of wire to the speaker wires.
Cut thin strips of electrical tape and wrap that around the speaker. This will be used to "force fit" the speaker into the PVC tube.
Push the speaker into the PVC tube (same end of tube as the motion detector). It should be a snug fit.
You should be able to get a snug friction fit of the PVC into the hole in the plywood. If the PVC is too loose, wrap electrical tape around the pipe...
Note the little loop in the wire wrap wire. If I failed to identify that wire earlier, I wouldn't know which wire goes to the switch. (3) on the sc...
(4) on schematic
Radio Shack's record module (#276-1323) has changed over time. You can remove the "play" switch and find a spot to solder two wires such that touchi...
(6) on the schematic
(7) on the schematic
This is the output from the motion sensor, through a 270 ohm resistor to the base of a NPN transistor.(8) on the schematic
(9) on the schematic
(10) on schematic
(11) on schematic
(12) on schematic
(13) on schematic
(14) on schematic
(15) on schematic
Take a 1/2 inch by 6 inch stainless steel strip and trim the end so that it will fit between the magnets on the scrolling message sign's (thinkgeek.c...
Drill a hole and fasten the "billboard support" to the plywood.
Add a 9 volt battery to the speech module and add 3 AAA's to the motion sensor supply. Using electrical tape, tape down anything that is loose or tha...
Turn the board right side up. Place the scrolling sign on its mounting bracket. Tether the car to the paperclip "pole." Turn on the motion detecto...
This takes a while, as you have to work around the switch, paperclip "pole", PVC pipe, wires and sign mount.It is very critical to keep a smooth runn...
You can set this assembly on top of the wrapped package. If you are so sure of yourself that you've made no errors and that the batteries will ...
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