Build a protest/demonstration sign that can be seen at night. This project makes it simple to use your own graphics on the sign -- it's as easy as dragging and dropping .bmp image files into a folder.

CircuitPython running on the Feather M4 with the RGB Matrix FeatherWing drives any of our RGB LED matrix panels.

You can use the large 6mm pitch version and 3D print the provided brackets to hold LED diffusing plastic. Screw a yardstick or other thin strip of wood to the panel and you can go out and march.


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Folks love our wide selection of RGB matrices and accessories, for making custom colorful LED displays... and our RGB Matrix Shields...
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Angled shot rectangular black 8 x AA battery holder with 5.5mm/2.1mm plug and on/off switch.
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UBEC DC/DC Step-Down (Buck) Converter with two sets of power wires
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Panel Mount 2.1mm DC barrel jack
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5.5 / 2.1mm Barrel Connector - DC Power Plug
DIY? How about D-I-Wire! This barrel jack plug is great for adding a common power connector to the end of your wires. The jack is compatible with 5.5mm barrel jacks that have a...
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Or, instead of the MatrixPortal, you can use a Feather M4 + Matrix FeatherWing.
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If using MatrixPortal: a high current-capable USB power bank may be sufficient to power this. If Feather M4: many external laptop battery units can provide 9–16V for the UBEC. Either of these is worth considering if you already have one around…but otherwise, they tend to be expensive and require some experimentation. For most users, we suggest going with the Feather and the AA battery pack above.

Additional Materials

In addition to the parts above, you'll need:

  • 8 ea. AA NiMH rechargeable batteries
  • A length of 2" x 1/4" wood for a handle, such as a yard stick
  • 6 ea. M3 x 8mm screws for securing the brackets (these can be the typical Phillips head, but I really like hex drive screws)
  • 2 ea. M3 x 12mm screws for attaching the handle
  • Sheet of diffusing acrylic 385mm x 190mm x 3mm such as Chemcast Black LED Acrylic
  • Velcro or double stick foam tape to secure the battery holder
  • Zip ties

3D Printing

For the brackets and Feather cover, you'll need access to a 3D printer and some PLA or similar filament.


You'll need:

  • screwdriver
  • soldering iron and solder
  • wire strippers
  • hand drill

This guide was first published on Jun 23, 2020. It was last updated on Jul 13, 2024.

This page (Overview) was last updated on Mar 08, 2024.

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