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I'm helping my daughter with a science project. We're designing a glove for crossing guards with red and green LEDs attached. I thought it would be a good idea to put a small button in the thumb area that when pressed would turn off the green LEDs and turn on the red LEDs. Then when released the reds turn off and the greens turn back on. Here are the LEDs we're thinking of trying: String LEDs

Looks like I'll need to cut the battery pack and wire the switch/button in between. Where I'm struggling is what kind of button to use (SPDT/DPDT) and how to wire it.

Also, could I hack the battery pack and combine the wiring to make a master on/off switch that controlled them both?

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  • \$\begingroup\$ I would not recommend these LEDs for brightness in daytime or batteries for sufficient power. There are better choices. Then use 3 position switch with centre off to feed power. \$\endgroup\$ – Sunnyskyguy EE75 Sep 6 '17 at 19:26
  • \$\begingroup\$ Tony, thanks for the heads up. Do you have any recommendations? Remember, we're trying for something to fit with a work glove. We're thinking green LEDs will be on the back hand and fingers while red LEDs will be on the inside of the hand. Concealing a power source (battery park) in the glove is going to be challenging. \$\endgroup\$ – Andrew Box Sep 6 '17 at 19:30
  • \$\begingroup\$ Other challenges include power source matching, adhesion, waterproofing, and wrinkle damage proof to flexible thin tracks. RED, YELLOW are 2V , Green, Blue White are 3.1V and strips made for 5V drop the difference in SMD resistors. 12V types string 3 in series, Waterproof RGB are avail in stiffer 10mm wide tape but self-adhesive tape wont work on leather or cloth. \$\endgroup\$ – Sunnyskyguy EE75 Sep 6 '17 at 19:43
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A single pole dual throw ( SPDT ) switch or button should be sufficient for this.

How you wire it will depend on exactly what that "battery-pack" does. It may me possible to wire it directly to the LED strings as shown here..

schematic

However, if the drivers are more complex current drivers, it may not be possible to switch them safely down-stream of the regulator. Something like the following circuit may be required to switch a separated battery to each regulator.

schematic

simulate this circuit – Schematic created using CircuitLab

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    \$\begingroup\$ Awesome! I thought it was SPDT but I wasn't entirely sure. That schematic is perfect. Thanks, Trevor! \$\endgroup\$ – Andrew Box Sep 6 '17 at 19:31

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