5mm LED

Single colour through-hole LED driven from one GPIO pin. Requires a series current limiting resistor. Brightness control needs a PWM capable pin.

Actuator LED-5MM 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
Model number LED-5MM
Actuator type led
Command topic suffix command/led
Response topic suffix response/led

Commands

CommandArgumentRangeDescription
ON none - Turn the LED on at full brightness
OFF none - Turn the LED off
SET_BRIGHTNESS brightness 0 to 100 % Set brightness by PWM duty cycle. Requires a PWM capable pin
BLINK interval 0.1 to 60 s Blink at a fixed interval until another command is issued

Wiring

PinRequiredNotes
anode Yes Series resistor required between the pin and the anode. Size it for the forward voltage of the colour fitted, typically 220R at 3.3V for red and 100R for blue, green or white.
cathode Yes To ground. Use a PWM capable pin on the anode if brightness control is needed.

Supply: 3.3V or 5V through a series resistor

Failure modes

  • A series resistor is mandatory on every anode. Without one the LED is across the full supply and either the die or the GPIO pin fails, usually within seconds and often silently at first.
  • Sizing the resistor needs the forward voltage of that colour, which is not the same across colours. Red and yellow are around 2.0V, green blue and white around 3.0V to 3.4V. A resistor calculated for red run on a blue LED gives a dim output; one calculated for blue run on red overdrives it.
  • Reversed polarity does not light and does not obviously fail. The longer leg is the anode. A flat on the rim marks the cathode.
  • Continuous current above 20mA shortens life even where the LED still lights. Most GPIO pins are rated well below what a chain of LEDs draws, and the total across all pins has its own limit that is easy to exceed with a handful of indicators.
  • Software PWM produces visible flicker on a loaded processor. Use a hardware PWM pin where the brightness matters.

Entry

Keyled-5mm
StatusDraft
Revision1
Registry0.3.0
Entry on GitHub JSON for agents

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