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Cut the negative wire in half. Splice the wires connected to the battery at both ends of the extra black (negative) wire.
I was a bit worried about soldering but there are great instructables to help you learn how. I got a crash course from Fat Cat and it was not that bad. Take the negative wire that is connected to the "battery holder" and wrap it around the outside prong of the toggle switch. Solder the wire to the switch. Take the extra negative wire (our black wire) and connect that to the center prong on the switch. Solder it on. Now your switch is ready!
Most LEDs that we have found have the longer leg as positive. We bent the negative leg (the shorter) up so that we could easily see the difference. Take the negative wire (black) that is connected to the toggle switch and wrap it around the negative leg of the LED. Solder in place. Take the positive wire (grey) that is connected to the "battery holder" and wrap that around the positive end of the LED. Solder. Does the light turn on? No? Try the switch ;-)
Drill ahole just slightly larger then the toggle switch switch into the side of the film canister. We found it easier with the lid on. We also liked the hole being in the upper 1/4 of the canister (close to the lid). It felt more natural in the hand. Drill another hole into the lid of the canister. It was easier to have the lid on the canister while drilling. This hole is for the LED holder. We found that it was a good idea to punch a hole into the lid with a nail and then drill. The drill bit needs to be the right size for the LED holder. Better to start a bit smaller and work your way to a bigger hole until the holder fits.
Insert LED holder into lid.
Slide switch through the side hole and tighten screws.
Push LED into LED holder. Hot glue (we actually use a low temp. glue gun) the exposed wires but do not glue to the side of the canister or you may not be able to close the lid. Wires will stick out. Snap on lid after glue dries.
Turn your film canister flashlight on and try it out!
The magnet was a great idea. The light can hang in some really great places. We have had it in a dark place in the basement, as a night light, and in our lockers.
This film canister flashlight was more fun to build then an Altoids flashlight and feels so much more comfortable in our hands. Don't get us wrong, the Altoids tins are great. We just love the handiness of this little guy and no metal shavings when you drill into it!. We had it out by the pool as a nice affect, hanging in the basement where we needed extra light, by Cool Cat's bed as a night light, Ally Cat took it to school to hang in her locker, and of course we all use it as a flashlight.Type your paragraph here.
3 Volt Battery
1 to 3 Magnets (depends on your method)
2 Wires (of different color and about five inches long)
The first magnet is to hold the flashlight up on magnetic surfaces. Place a bead of glue into the bottom of the film canister and add your magnet. This will need to be a fairly strong magnet to hold the canister up. We found 1 inch ceramic magnets worked well and did not cost to much.
We tried two different ways to hold the battery to the wires. This is the first way but uses two more magnets.
Make sure that the magnets will attract each other and not repel. We suggest marking the magnets.
Expose a large amount of wire, nearly 1 1/2 inches, on each of your wires.
Wrap your wire through the magnet or around the magnet if yours does not have holes in it. Do this for both wires.
Check the polarity of the magnets to make sure they will be able to be attracted to each other and the magnet in the bottom of the film canister.
Place your 3 volt battery between your two wired up magnets. Take note of which wire was touching the positive side and which wire was touching the negative side of the battery. In our pictures we used black for negative and gray for positive.
Glue the magnets into place by gluing the the top, bottom, and a side of your "battery holder".
Much easier but not as much fun.
Strip the wires leaving about 1/4 inch of wire exposed.
Place the wire on to 3 volt coin battery. Using the electrical tape, tape the wires on to opposite ends of the battery. Make a note of which wire is on the negative end and which wire is on the positive end. In our pictures we have black as negative and gray as positive.
Cat's Science club