Instructables
Picture of The useless alarmed Coke can
Hi all!
This is the most useless project in the world! It consist in a Coke can attached to an Arduino trough a coaxial cable and two resistors that make a sound when an hand is near it.
 
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Step 1: Materials and Tools

Picture of Materials and Tools
For make that I've used:

Materials:
-1x Arduino Uno Board (or equivalent)
-1x 270kOhm resistor
-1x 10kOhm resistor
-1x alligator clip (not in the photo)
- a piece of coaxial cable
- a short wire
-1x Piezo speaker
-1x rubber band (optional)
-1x full Coke can (not an empty one!)
-1x beer coaster
-2x A4 sheets of printer paper

Tools:
- scissors
- tape (of any sort, for example I've used insulating tape)
- glue stick
- fibre pen (not in the photo and optional: it' s for making the sign "FREE COKE")
- soldering iron with relative tools (not in the photo)

Step 2: Empty the can

Take the can and, carefully, make a little hole on the bottom of it with the scissors. Let the gas come out and enlarge the hole. Then make an other one hole and make out the liquid in a glass. This is a VERY long process so be patient.
vstout8 months ago

doesn't work

giuliom_95 (author)  vstout8 months ago

It doesn't work your replication of my project. Maybe you've did something wrong... If you need I'll help you but, please, don't say that something doesn't work (apparently only to you) before of trying every way to make it work!

jasonZak1 year ago
Why didn't you just make the coaster pressure sensitive?
giuliom_95 (author)  jasonZak1 year ago
Because in this way it uses electrodynamics‘ and electrostatics‘ priciples so, at least for me, it is more interesting.
rehanpasha1 year ago
well, its impressive with the model. but when i reach to the programming step i cant find any solution,
After creating this model, how do i implement with the program.
giuliom_95 (author)  rehanpasha1 year ago
Sincerly, I've not very well understood your question. You simply don't know about upload code to an Arduino board, you get some errors while uploading or what else?
tim_n1 year ago
Looks like beer mats from the Augustiner in Munich to me (having drunk and been drunk in there many times... And returning there next June!
giuliom_95 (author)  tim_n1 year ago
Well, it IS a coaster of the Augustiner beer of Munich!
this should be one for all of alcoholics.(parents)
kretzlord1 year ago
Diy theremin?
giuliom_95 (author)  kretzlord1 year ago
Maybe... If you make some modifies to the sketch it will become a very simple theremin but I don't recommend it because it's too elementary and probably it will not work well
firesirt1 year ago
hook this up to This for some real fun.
poofrabbit1 year ago
Useless? Nah, looks more like a great day of fun! Nice job!
giuliom_95 (author)  poofrabbit1 year ago
Well, maybe it's not useless before and while making it, because is a beautiful pastime, but once it's done, I don't really find a utility to this thing... However, thanks for your appreciation!