Photosensitive Seizure Warning: This project involves bright flashing lights! It may not be suitable if there are sufferers of epilepsy present.

  1. In this project you will sew LED lights to a t-shirt and program them to flash and change colours by writing code!

  2. The LEDs will be controlled by the Adafruit Flora. You may also use an Adafruit Gemma, LilyPad Arduino or LilyPad Arduino USB; some small code changes will be needed such as the number of the output pin and the board setup in the Arduino IDE.

    • Note: the Gemma does not work with Linux. It also won't work with a USB 3.0 port, so you must have a USB 2.0 port or hub to connect the Gemma to the computer.
  3. Download and install the Arduino IDE from Once installed, open the application. There a few extra things needed to make it work for this project.

  4. Open the Preferences from the Arduino menu. In the Additional Board Manager URLs box, paste the following and click OK.
  5. In the Tools menu, go to Board and select Boards Manager.... Choose Contributed from the dropdown. Install Adafruit AVR Boards by Adafruit. Click Close.

  6. Quit and restart Arduino IDE. You should see the Adafruit Flora and the Adafruit Gemma listed in the Boards menu now as well as the LilyPad Arduino and LilyPad Arduino USB. Select the board you will be using.

  7. In the Sketch menu, go to Include Library and select Manage Libraries.... Type neopixel into the search box. Install Adafruit NeoPixel by Adafruit. Click Close.

  8. You will need the following materials for this project

    • Adafruit Flora or Gemma and a USB cable
    • Around eight NeoPixels
    • Conductive thread
    • Three pairs of crocodile clips (you can also use pieces of conductive thread instead, but crocodile clips are easier to test with)
    • Optional: a battery pack will allow you to wear your finished project without being attached to the computer!
    • An embroidery needle and scissors
    • A t-shirt
    • Clear nail polish
    • Optional: an embroidery hoop is recommended to make stitching up your circuit easier

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