Ledify

A super small addressable LED controller with USB-C PD up to 100W, a switchable 5V/12V output and Bluetooth!

Key Features • PCB • Firmware • Credits • License

Key Features

• ESP32-C6 microcontroller with Wi-Fi 6 and Bluetooth LE
• 16MB flash (W25Q128JVP)
• USB-C PD up to 100W with the FUSB302B
• Switchable 5V/12V LED output from a 10A buck converter (LM61495), selected in software
• Addressable LED pads (VCC / SIG / GND) for WS2812B, WS2811 and WS2815 strips
• IMU and Barometer - BMI323 (6-axis) and BMP581 pressure sensor
• Ambient light sensor (OPT4001) for automatic brightness
• I2S microphone (ICS-43434) for sound-reactive effects
• PCB trace antenna with an impedance matching network
• 3.3V buck converter (AP63203) for the logic side
• ESD protection on the USB data lines
• Reset and boot buttons and a mounting hole
• 4-layer PCB design with optimized RF layout and routing

PCB

Designed in KiCad with attention to RF design and high current power delivery. The board is 4 layers with a solid ground plane under the ESP32, the flash and the antenna feed, and the LED buck follows the layout in the LM61495 datasheet.

Schematic

Layout

Pinout

Next revision

Rev 1 works; these are the changes queued for rev 2, each with the reason it is worth a spin of the board.

Free GPIOs after rev 1: 0, 1, 14, 17 (4 and 15 are strapping pins). The feedback network today: 100 kΩ top, 24.9 kΩ bottom, 1.0 V reference, 5.02 V; Q1 adds 14.3 kΩ in parallel for 12.0 V.

JLCPCB Quote

Firmware

The firmware in firmware/ is an ESP-IDF v6.1 project with drivers for everything on the board: USB-PD negotiation on the FUSB302B, the LED strip, the light sensor, IMU, barometer and microphone. It takes the same text commands from three places: the USB serial console, Bluetooth (it advertises as Ledify with the Nordic UART service, so nRF Connect or Bluefruit Connect work) and MQTT. Point it at a Wi-Fi network and a broker and it shows up in Home Assistant on its own as a light with eight effects (solid, rainbow, temperature, spectrum, meter, sound, VU, pulse), an auto-brightness switch, sliders for the pixel count and the sound, light and temperature tunables, a chip-type select and illuminance, temperature, pressure and sound sensors. The colour source, brightness source and overlay can also be mixed freely, so a rainbow VU meter that dims in a dark room is three commands. Brightness is capped automatically to what the USB-PD contract can supply, so a long strip on a laptop port dims instead of browning out.

The output always boots at 5V and off, and the board asks the charger for the highest voltage up to 20V as soon as it starts. Credentials, the strip length, the chip type and the tunables are stored in the ESP32's NVS partition, never in the code. SIG is 3.3V logic going to the strip's DIN; the wiring notes, MQTT topics and the Mosquitto-on-Railway broker setup are in firmware/README.md.

Building and flashing

cd firmware
source ~/.espressif/tools/activate_idf_v6.1.sh
idf.py build
idf.py -p /dev/cu.usbmodem2101 flash monitor

Credits

This project uses:

• KiCad
• Blender for 3D renders
• MicroPython

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License

MIT

notaroomba.dev  ·  GitHub @NotARoomba  ·