Neopixel signals

There are two types possible:

a mast with separate fixed colour pixels for each aspect
a mast with one multiple colour pixel for all aspects.

Bear in mind that a single multicolour neopixel used above might be physically a multi-colour LED (as in a searchlight signal), or 3 individual LEDS wired to a single neopixel chip (ws2812) (as in a 2 or 3 lamp signal).

For separate pixels, the colours should be established at startup and a normal SIGNALH macro used.

AUTOSTART
  SIGNALH(1010,1011,1012)
  NEOPIXEL(1010,255,0,0)
  NEOPIXEL(1011,128,128,0)
  NEOPIXEL(1012,0,255,0)
  RED(1010)  // force signal state otherwise all 3 lights will be on
  DONE

For signals with 1 neopixel, the NEOPIXEL_SIGNAL macro will create a signal on one vpin with three separate colours

NEOPIXEL_SIGNAL(vpin,redfx,amberfx,greenfx)

redfx,``amberfx``,``greenfx`` = colour values

The fx values above can be created by the NeoRGB macro so a bright red would be NeoRGB(255,0,0) bright green NeoRGB(0,255,0) and amber something like NeoRGB(255,100,0). NeoRGB creates a single int32_t value so it can be used in several ways as convenient (but can’t be used in an ALIAS command).

// create 1-lamp signal with NeoRGB colours
NEOPIXEL_SIGNAL(1000,NeoRGB(255,0,0),NeoRGB(255,100,0),NeoRGB(0,255,0))

// Create 1-lamp signal with named colours.
// This is better if you have multiple signals.
// (Note: ALIAS is not suitable due to word length defaults)
#define REDLAMP NeoRGB(255,0,0)
#define AMBERLAMP NeoRGB(255,100,0)
#define GREENLAMP NeoRGB(0,255,0)
NEOPIXEL_SIGNAL(1001,REDLAMP,AMBERLAMP,GREENLAMP)

// Create 1-lamp signal with web type RGB colours
NEOPIXEL_SIGNAL(1002,0xFF0000,0xFF6400,0x00FF00)