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