|I sewed eacghneopixel to the tiara using silver |
thread. Here's the first, ready to go..
The "V2" on the back side happens to be on the
"data-in" pin, so I started there with each one.
|Here's the tiara with pixels shown. I'm still have to clean up the stray threads.|
Next I soldered the neopixels together (+ to +, - to -, DO to DI), then connected the Gemma to the first neopixel for a test, using alligator test leads--see the video. The soldering took a couple of hours. For each wire, I used calipers to measure the distance between neopixel pads, stripped 14", marked the desired length of unstripped wire (from the calipers), cut the wire 1/4" beyond, and stripped 1/4" off that end.
I did the data bus first, and used stranded wire. That turned out to be a huge pain--it's too flexible and the ends are hard to deal with. I switched to 22awg solid core wire for the power and GND busses. Much easier. I will go back to stranded when I wire the Gemma, because I will need the flexibility.
Also, I discovered (or remembered, not sure which) that Gemma has an on-off switch on board. That simplifies this circuit (I don't need to add a switch).
- trim stray threads and wire to clean up as much as possible
- re-sew at least one of the neopixels (some threads got burned during soldering)
- secure and insulate the threads and wires with nail polish
- add the 100mAh battery
- glue the Gemma to the tiara
- solder the Gemma connections to the circuit, attach the battery to the tiara.
- 100mAh LiPo battery
- 26AWG Silicone-coated stranded wire
- 22AWG solid-core hookup wire
- Flora RGB V2 Neopixels (6)
- Plastic Tiara (found a pack of 6 at Party City, which is 50mi away--ordered online)
- Gemma (could also use a Trinket...)
- Needle and thread
- Nail polish
- Soldering Iron and associated paraphernalia
- A battery charger like this would be helpful