Instructables
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Lately, I've heard a lot of junk. Due to our consumerist lifestyle, we discarded equipment in good working condition to buy the latest release. Thus, we contribute more to the growth of this garbage. My intention was to recycle this type of material and inspire others to do the same.



Materials needed:

- A reader of CD's

- A piece of cardboard 15X30 cm

- An old cd

- Reedswitch a normally open (magnetic drive key easily found in electronics stores)

- A calculator

- 2 screws with washers and nuts (optional)

- Wires

- Glue

- Hot glue

- A rubber band to hold money
 
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Step 1: Separating Material

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Open the reader, highlighting the optics, the engine that runs the cd and the amount of metal is in above the engine, setting the album to him. At the optics, remove the two magnets. Be careful because these two magnets are very strong and can unite, injuring the fingers or hand.

The cardboard was cut into three strips of 25 x 5 cm.

The reed switch was stuck on a small piece of cardboard, the edges with hot glue to be handled because it is very fragile.

Open the calculator and connect a wire to connect each of the SAME button and set aside.

I soldered the wires on a jumper and I fixed it so that no contact from the outside. This way when not in use, simply unplug the wires.

Step 2: Mounting

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- Glue the magnets at the ends of the CD so that they are 180 ° from each other

- Paste the strips of cardboard.

- Solder the wires on the Reed Switch

- Determine the amount of cardboard in the engine using two screws with nuts and washers.

- With the help of hot glue, glue the reed switch in the engine mount so that the magnets pass in front of him.

- Plug the wire into the calculator and set it on cardboard with the help of the elastic. Hold the excess wire in the rubber band.

- Program the calculator.
Very Nice !!!
I made similar project when I was in college but I use optical coupler as shown in web site below
http://hushamsamir.tripod.com/distance_meter.htm
PeckLauros (author)  Husham Samir1 year ago
The optical coupler is a cheap and effective solution. However, I decided to use materials I had at home. And the reed switch very well attended. I like your project. Good job.
Great idea! Although I would suggest rewording a few of the steps as i got confused about how to wire the calculator
PeckLauros (author)  supertroopa863 years ago
Hello in the calculator, the button "equal" has two contacts like a key open. It is simply solder two wires in such contacts.
I was working on the same thing for the transform it contest by a shaft encoder from an old mouse and a PIC microcontroller, but you did it first, good luck.
PeckLauros (author)  vahid_you20044 years ago
Thanks. I thought the same thing about your crazy mouse...hehehhe. Incredible!
mathieulj4 years ago
The basic idea is quite neat, although I would likely make a few modifications if i built one. Ex... more magnets( more precision), rubber rimmed wheel(reduce slipage), and i might go all out and do some microcontroller action but that overkill.
PeckLauros (author)  mathieulj4 years ago
Good idea. I thought the same. But the main idea was to make somethig easy to make and faster. thanks to share your idea