While this version of the card requires the recipient to own or purchase two crocodile clip connectors, I created a simple battery holder in later versions by crossing the two strips of conductive tape and sandwiching the 3V button battery in between.
Please see illustration for optimal solution (though it does not correspond exactly with the photos I took of my first example) >> Download illustration
I reproduced this Christmas card 20 times, mailed them out from Austria and hope that they all arrived.
Step 1: Materials and Tools
- Conductive thread from http://www.sparkfun.com or http://www.lessemf.com
also see http://cnmat.berkeley.edu/resource/conductive_thread
- Conductive tape from http://wwwl.essemf.com
- 3V button battery (and holder)
- Crocodile clips
- Regular colored thread
- Nice colored cardboard
- Decorative pens
- Scissors or cutting knife and mat
- Sewing machine