Use tape to attach conductive thread to the positive and negative terminals of a 3V coin cell battery to power up a thru hole LED.      

  I use 3V coin cell batteries in many of my eTextile and paper computing projects. They’re small, easy to use, and effectively power multiple LEDs. In general the negative terminal is the underside, unmarked, and has a dotted textured surface. While the positive side will be marked with a + symbol. These CR2032, as with the design of most […]

    Connecting the postive and negative terminals of the Maxbotix range finder to a Keystone Electronics Battery Holder.   more information on battery holder can be found on my 25 January 2013 blog post  

    Current flows from the battery along the negative trace (black) thru a resistor and to the negative lead of the LED. The electrons jump the P-N Junction inside the lens cap emitting light and the depleted current returns to the battery along the positive trace (red). Other blog posts on LED’s LED Close Up  

So many options for 3V CR2032 coin cell battery holders to sew into eTextile projects.

I don’t know about you, but I order my batteries thru eBay. easy and cheap. As soon as I get them I test a few for longevity. Stay tuned….. I’ll post when the LED goes out. The LED remained illuminated until Monday. Not as bright as I might want but still glowing. All in all – $13 USD for 100 […]

Two more great options for a sewable battery holder!! Both are SMD that already have holes in the terminal ends. Perfect for your needle and conductive thread! Digi Key 1082KCT-ND 2 cell 20mm Battery Holder Keystone Electronics         DigiKey 1061K-ND 1 cell 20mm Battery Holder Keystone Electronics Pro Tip – It is difficult to get the battery […]