This is my collection of Arduino Gemma programs. They make things light up.
The Wearables directory contains programs written for the Jewelbots Wearables Kit 1.0.
This kit combined an Arduino Gemma with five LED sequins (our LEDs were green).
Two LEDs are wired to D0. Two are wired to D2. The final LED is wired to
D1. The Gemma has a D1 light in the center of the board, meaning we also
have two D1 lights!
When laying out the Gemma and LEDs, you can get a nice pattern by creating a
chain. In the following illustration, I have annotated the Gemma and LEDs by
the data line connecting to the light. Remember that the Gemma has a D1
light at its center.
Gemma(D1) - LED(D2) - LED(D0) - LED(D1) - LED(D2) - LED(D0)
If you just try and lay out this design on a flat surface, you are going to have a hard time avoiding overlapping wires. This might not matter when using coated wires, but it makes a different when sewing with conductive thread!
Avoid letting those overlapping threads touch by separating the thread with layers of fabric. Thick fabric like felt worked well; thinner fabrics might not be as effective.
The NeoPixel directory contains a number of programs that use the Adafruit NeoPixel Library with the Arduino Gemma.
I used the NeoPixel ring with 16 LED pixels. The programs may work with other NeoPixel devices - you will at least need to adjust the number of pixels when initializing the NeoPixel object:
Adafruit_NeoPixel strip = Adafruit_NeoPixel(16, PIN);A lot of the programs rotate/spin. Those designs might not be quite as interesting on a linear NeoPixel strip.
Follow the wiring from Adafruit's Gemma Hoop Earrings project.
GND on the Gemma is wired to GND on the NeoPixel ring. The Gemma Vout goes to
Vcc. D0 is wired to the ring's Data IN.