Introduction: Limpet Push-Button

Seashells and electronics - what to do with all those limpets except for to fit push-buttons, batteries, holders and motors and LEDs inside.

It took me a while to figure out the right term for these shells. They are limpets and not barnacles, as i originally thought they were >>
http://evolution.berkeley.edu/evolibrary/article/analogy_01

I've always liked collecting seashells, and have always wanted to do something more with them than accumulate them in my parent's garden. So now I want to see how far I can go to integrate small electronic circuits inside them. Limpets are nice to work with because they are totally open on one side and the bigger ones even offer some depth.

The limpet buttons are very simple, they use a push-button to trigger LED light or a vibration motor. I decided to use a push-button rather than a switch so that they are only active when touched/pushed.

Video

Step 1: Materials and Tools

MATERIALS
  • Limpets from the beach
  • Push-button switch
  • LED or vibration motor
  • 3V button battery holder
  • 3V button battery
  • Hot glue
  • Solder

TOOLS
  • File
  • Soldering iron
  • Hot glue gun

Step 2: Preparing Components

First you will want to make sure you have found the smallest components possible and that when assembled they all fit inside the limpet you would like to use.

If things don't quite fit, you can try sanding down the button battery holder around the edges, finding an even smaller push-button and a smaller LED and/or vibration motor.

Superglue the push-button to the side of your button battery holder, so that the pushy part sticks out just slightly over the rim of the limpet.

Step 3: Circuit

Solder one of the push-button legs to the closest battery holder leg.

Place the LED or vibration motor on the bottom of the button battery holder. Keep in place with some sticky tape or hot glue if necessary. Solder the connections, make sure to solder the positive leg of the LED to the positive leg of the battery holder.

See schematic and illustration for details >>

Step 4: Hot Glue

One last time, place the limpet on top of your circuitry and check if it works.

Fill the limpet with some hot glue, less than half full. Then insert the circuitry and push down so that it is in the right positions. turn upside down and check to make sure it will work. then let it cool.

Finished!

Comments

author
woodstockbirdy (author)2010-07-01

where do u get all those small components

author
Plusea (author)woodstockbirdy2010-07-01

from inside electronic toys

author
kylemcdonald (author)2009-04-21

This reminds me of Jared Tarbell's laser engraving of sandstone in that you're both taking a media/process (laser engraving, interactive electronics) and applying it to some natural feature. I really like this direction/idea :)

author
thepelton (author)kylemcdonald2009-04-28

I have tested laser engraving on shell. It does work, but I can't get them for free here in Colorado. I remember that I could find almost all the limpets that I wanted when I was living in San Diego.

author
trailleadr (author)2009-04-20

or use them as pasties. :p

author
thepelton (author)trailleadr2009-04-21

The standard limpet without a center hole grows to be only about 1 inch (25mm) across. They might work as pasties for a Barbie Doll.

author
Plusea (author)thepelton2009-04-21

yes - what do you mean by pasties?

author
Lftndbt (author)Plusea2009-04-28

yes - what do you mean by pasties?

That has to be one of the funniest things I ever heard. Not that you don't know, just the question being asked.

author
lemonie (author)Plusea2009-04-21

The type that cover a lady-entertainer's 'modesty' while they're pretty-much naked I think (these). I don't know what sort of Barbie(R) dolls thepelton plays with...

L

author
thepelton (author)lemonie2009-04-27

That's for me to know, and you to imagine. (Where is the button to make a bronx cheer?)

author
thepelton (author)2009-04-27

This gives me an idea for a custom keyboard.

author
skalipi (author)2009-04-24

Aloha.. In Hawai'i we call these OPIHI's Opeehee...like that LOl..nice light

author
lemonie (author)2009-04-20

I like it! But I think those are limpet shells?

L

author
Plusea (author)lemonie2009-04-21

You are totally right and i have corrected the mistake!
Thank you for pointing it out.
http://evolution.berkeley.edu/evolibrary/article/analogy_01

author
lemonie (author)Plusea2009-04-21

They must be fun to have on a desk - it's making me think of things... L

author
Dr.Bill (author)lemonie2009-04-21

cool man.

author
Dr.Bill (author)2009-04-21

Opihi. They only have one shell and they stick to da rocks in sometimes very rough shoreline out here Hawai'i. So ono too!

author
lieuwe (author)2009-04-20

wow, people are going to be terified if they accidently push one off those :-P nice project, you could make a realy complicated device and replace all knobs and buttons by the things XD

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