Cut the female connector off the end of one of your LED strands. Hook up the three wires to your Circuit Playground Bluefruit as shown. On my strands, the left most wire (with the resin bump on the LEDs facing you) is power, the middle wire is ground, and the one on the right is data.
It's very important to test these and make sure you have the connections right. These strips are not marked in any way, and we've gotten inconsistent wiring with different lots, so testing is essential. If you can't get the lights to come on, play around with different configurations or try connecting data to the other end.
If you're having trouble, here is a guide showing how to set up your Circuit Playground Express as a tester using MakeCode.
Once you've established your wiring, it's a good idea to mark the wires with some heat shrink or tape so you keep them straight.
Strip a generous 1/4" of shielding from each wire. Do the same with your second strip and twist the wires together: power to power, ground to ground, and data to data.
Hook both wires back up to your tester and make sure they're both working. Add your third strand in and make sure that one comes on too.
Solder a red, black, and colored wire to the power, ground, and data clusters. Cover the connections with heat shrink.
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