Once your mask is done and the Circuit Playground Express is programmed, you can add all the electronics to the mask!
The CPX board slips right into the filter pouch. You can carry the AAA battery pack in a pocket, or use the belt clip to attach it to a piece of clothing.
Make sure it won't snag on anything as you walk around. You may want to thread the extension wire down into your collar and under your shirt.
Attach the JST extension wire to the battery pack. If it's not long enough to reach from the mask to wherever you are going to carry the battery, attach a second extension wire to the first.
Slide the end of the extension wire through the opening you left in the bottom seam. Thread it into the pouch and connect it to the CPX board.
To test it out, position the CPX in the middle of the mask, with the wire pointed towards the side its threaded through. In other words, the board will be sideways, with the lights positioned at the top and bottom.
Try on the mask and adjust the board so it sits over your mouth.
Then turn on the batteries and say something to see how it works!