The wiring for this project is a bit complicated, but the Feather RP2040 Scorpio makes it as easy as possible to get all these strips wired up and running.

For my project I've got seven strips running drips: three in the front, one on each side seam, and two on the back. The 8th strip is used for the splats around the hem of the dress. The diagram above is a conceptual schematic; the actual strip lengths will be different, and will depend on the lengths you decide.

The seven drip strips are each split into two sections: the top "ooze" section uses two identical strips of 90/m side-light NeoPixels, which then feed into a longer section of 60/m standard NeoPixels for the vertical "drip" section.  The "splat" strip around the hemline is a strand of Slim NeoPixel Dots. 

Each pixel strip is connected to its own data and ground pin, which are helpfully arranged along the bottom of the Feather. The 5V+ connections from the NeoPixels all get wired together and connected to USB (if you're powering with a USB battery or through the USB port) or BAT (if you're powering with a LiPoly battery).

There is a momentary switch button wired into pins A2 and A3. This button is used to activate "Carrie Mode" which temporarily turns all the drips to blood red.