Instructables
Picture of electronic sewing kit (pulse warmer)
The eyes on this Jack-o-lantern knitted wristband light up RED when you squeeze it.

I was already knitting a wrist band / pulse warmer when I thought: wouldn't it be fun it this could light up?! So I added some LEDs and a switch. This guide does not teach how to knit, as I assume you want to add lights to a piece you've already made.

In addition to the lights, switch, and battery, you will also need some conductive thread or some really thin wire for this project. This example was made with a ready-made kit from
http://www.aniomagic.com or you can learn how to make your own kit from http://www.cs.colorado.edu/~buechley/diy/diy_e_sewing.html

Disclaimer: the author sells the ready-made kits on Aniomagic's website.
 
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Step 1: Materials

Picture of Materials
The Electronic Sewing Kit (tm) from http://www.aniomagic.com contains:

- conductive thread
- two hand-made LED sequins
- a hand-made cloth switch
- a small, flat battery
- battery holder made from regular and condutive fabrics
- small patch of fabric

You can also get parts from other suppliers:

- Silver coated thread from Lame Lifesaver
- Light Emitting Diodes (LEDs): purchase from Digikey or your local RadioShack
- Tiny plastic switch from Digikey or your local RadioShack
- CR2032 battery: purchase from Digikey part #: P-189-ND (not shown in picture)
- CR2032 battery holder: purchase from Digikey part # 1061K-ND

See http://www.cs.colorado.edu/~buechley/diy/diy_e_sewing.html for further instructions, materials and tools if you decide to make your own kit.

Step 2: Arrange

Picture of Arrange
Arrange your pieces to see how they fit. While you're at it, tie off your thread with a knot.

Step 3: Lights to switch

Picture of Lights to switch
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Make several passes through the copper bead on any light. Secure your stitches with a knot.

Step 4: Second light

Picture of Second light
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Connect the second light by fastening its copper bead in the same way.

Step 5: The Switch

Picture of The Switch
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Now connect the switch. Apply a dash of fabric glue to keep your knots from untangling.

You must cut the thread after connecting the lights to the switch. If you just continue without cutting, your project won't work. This is because the electricity will go through that thread instead of through the switch or the lights. We call this a "short circuit", and you don't want that.
in cold countries you could add a nichrome wire and use it as a hand heater!
bduffman6 years ago
there called sweet bands im with fenwick never herd of a pulse warmer ahha
Patrik6 years ago
Hm - I was really hoping for something that would light up in time with the beat of your pulse! :-D Should be possible to rig something up with an electrode on the inside of the wristband (or even a little mic), and a band-pass filter tuned to the right range of frequencies...
Fenwick6 years ago
I've never heard them called "pulse warmers". Very cool.