Going out late on Halloween, but the big, bulky flashlight just weighs you down? Ever need a light so you can take the dog out at 3:00... In the morning? Want one that is barely bigger than a penny? Well, read on!
I always have loved LEDs. I made a flashlight in the Altoids Arctic tin, go check my 'ible about it! There is a big problem with flashlights though--
There are push buttons.
Push buttons aren't all that bad, they just are, well, "easy" to trigger. Put a flashlight in your pocket, and the button is pressed on, wasting away the battery. This is a waste of energy, which is hard to get. Ever drive by a big power-plant and see all of the big clumps of smoke coming out? Well, batteries are made in similar power plants. Luckily, agencies are watching how much smoke comes out of those plants, and they are fined if too much comes out. To solve the push button issue, I used the great reed switch. A reed switch has two prongs on the inside. When a magnet comes close, the bottom prong touches the top prong, making an electricity bridge. This can save energy, just keep the magnet in one pocket, and TinyLight in the other.!
Step 1: Lets Get Our Parts!
There are very few parts required for this project.
~ 1 - CR2025 Battery
~ 1 - CR2025 Battery Holder
~ 1 - Reed Switchd
~ 1 - 100 ohm resistor
~ 1 - LED (Any color, I used bright white)
~ 1 - Small piece of perf board.
~Soldering iron and solder
Step 2: Let's Get Soldering!
This is how it works. If you want to, breadboard it first.
We will start by taking our LED and placing it on the perf board. We will have it on the side where the solder pads are. Solder that on. Know where the pos. and neg. are? Good, because now we take our 100 ohm resistor and solder it to the pos. leg of the LED. This will provide a longer life for the LED. Take your reed switch and solder one end to the 100 ohm resistor. Take the other end and solder it to a leg on the battery holder. Solder the other leg of the battery holder and put it on the neg. leg of the LED. That is pretty much it. If you want to put it into a small case, then go ahead. An altoids smalls would be great for a casing.
Step 3: DONE!
Now, grab a magnet and put it onto the reed switch. See the LED glow? If it does not glow, check all of your connections.
Questions? Put them in the intro comments.
Ideas for me to create? Tell me in the intro comments.