An LED effect similar to the “digital rain” seen in the “Matrix” films with green lights flowing downwards on the keyboard.

Using the extension

To use the plugin, include the header, and tell the firmware to use it:

#include <Kaleidoscope-LEDEffect-DigitalRain.h>


void setup() {

  // Optionally adjust the configuration
  LEDDigitalRainEffect.setDropMs(260); // Make the rain fall more slowly

  // Optionally switch this LED mode on at startup

Plugin methods

The plugin provides the LEDDigitalRainEffect object, which has various public getters and setters for configuration, as well as the methods associated with all LED mode plugins.



Gets or sets the number of milliseconds it takes for a raindrop to decay from full intensity.

Defaults to 2000 milliseconds.



Gets or sets the number of milliseconds before digital raindrops fall one row.

Defaults to 180 milliseconds.



Get or set the inverse probability of a new raindrop appearing at the top of each column each time drops fall. Must be a value between 0 and 255.

Defaults to 18.



Get or set the intensity level (between 0 and 255) at which pure green (or red, or blue) should be output. This allows the timeshare ratio of tints vs shades of green to be controlled. A tint-shade ratio of 0 means all tints, while 255 means all shades.

Defaults to 208.



Gets or sets the maximum tint of a pixel. A value of 0 means nothing brighter than pure green (or red, or blue), while a value of 255 would mean tinting all the way to pure white.

Defaults to 192.



Gets or sets the color channel to use. Values can be either of the following:

  • LEDDigitalRainEffect.ColorChannel::RED

  • LEDDigitalRainEffect.ColorChannel::GREEN

  • LEDDigitalRainEffect.ColorChannel::BLUE

Defaults to green.