Hackaday Communicator badge gets hand-built RGB keyboard upgrade

The Communicator badge was already a keyboard-first gadget, but makeTVee treated that as a starting point, not a finish line. The result was a hand-built RGB upgrade that turned a badge-sized QWERTY into something much closer to a miniature custom board, with lighting, materials, and fit all carrying the same weight as the electronics.

At the center of the mod were 73 addressable LEDs, one for every key. Instead of hiding the light deep inside the case, makeTVee used the thinnest side-emitting addressable parts available, rated at 0.4 mm, and placed them by hand right at the edge of each key opening. That choice matters in keyboard culture because it is the difference between a gimmick and a build that looks intentional. The front panel became part of the typing experience, not just a glowing faceplate.

The key system got the same attention. The keys were resin-printed in a mix of white and transparent resin, about 80% transparent and 20% white, then the legends were marked in black with a paint marker pen. A thin flexible TPU frame, FDM printed in two layers at 0.3 mm, held the assembly together. That stack of materials reads like a builder’s notebook, and it hints at the real priorities here: keep the keys legible, keep the assembly compact, and keep the whole thing from feeling like fragile show hardware.

The lighting was not tacked on with an external controller, either. The LEDs ran from a GPIO on the badge CPU and were driven with MicroPython, so the RGB effect stayed tied to the device’s own hardware. The front PCB and keyboard also stayed compatible with the original stackup, replacing the original components rather than forcing a complete redesign.

That kind of restraint is part of what makes the mod interesting. The original Communicator badge, announced in 2025, was already a serious handheld wireless terminal with an LCD, an SX1262 LoRa module, LiPo battery and charging, and a Solder Party custom keyboard. Adafruit later described it as an ESP32-S3-based handheld computer with 8 MB of PSRAM and 16 MB of flash, which gives the badge enough muscle to justify a more expressive input surface. Hackaday also pointed out that the original badge used a silicone-cast key set, a reminder that for compact devices, molded or printed keys can make more sense than a standard switch footprint.

Seen at Hackaday Europe in Lecco, Italy, the mod fit the mood of the event perfectly. It was not just about adding RGB. It was about proving that even a badge can carry real keyboard expectations: tactility, personality, and the kind of small custom decisions that make a build feel worth keeping.