WS2812B RGB LED Strip

Addressable RGB LED strip. Each LED individually controllable via single data wire. 5V. Used for lighting and visual indicators.

Actuator Worldsemi WS2812B led gpio Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol gpio
Manufacturer Worldsemi
Model number WS2812B
Actuator type led
Command topic suffix command/led
Response topic suffix response/led

Commands

CommandArgumentRangeDescription
SET_COLOR colour - Set LED color. Payload: RGB hex value
SET_BRIGHTNESS brightness 0 to 100 % Set LED brightness. Payload: 0-255
ON none - Turn all LEDs on at current color and brightness
OFF none - Turn all LEDs off
EFFECT effect - Set a lighting effect. Payload: effect name

Wiring

PinRequiredNotes
din Yes Single wire data input with strict timing.

Supply: 5V

Failure modes

  • Timing is too tight for software bit-banging. On a Raspberry Pi it requires DMA driven PWM or SPI, and the PWM route conflicts with on-board audio.
  • The rpi-ws281x path requires root, which is a real constraint on a service that should not otherwise be privileged.
  • A 5V strip may not recognise a 3.3V data line. Long runs commonly need a level shifter on the first pixel.
  • Current scales with pixel count and brightness. A strip of any length must be powered from its own supply, injected at both ends for long runs, and cannot be fed from a board rail.

Entry

Keyws2812b
StatusDraft
Revision1
Registry0.3.0
Entry on GitHub JSON for agents

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