Arduino Source Code: Vacuum Tube LEDs with Morse Code message

## TubeMorse.ino
// Neopixel mood lighting for vacuum tubes
// Ed Nisley - KE4ANU - June 2016
// September 2016 - Add Morse library and blinkiness

#include <Adafruit_NeoPixel.h>
#include <morse.h>
#include <Entropy.h>

//----------
// Pin assignments

const byte PIN_NEO = A3;				// DO - data out to first Neopixel

const byte PIN_HEARTBEAT = 13;		// DO - Arduino LED

#define PIN_MORSE 12

//----------
// Constants

#define PIXELS 2
#define PIXEL_MORSE 1

#define MORSE_WPM 10

#define UPDATEINTERVAL 50ul
const unsigned long UpdateMS = UPDATEINTERVAL - 1ul;		// update LEDs only this many ms apart (minus loop() overhead)

// number of steps per cycle, before applying prime factors
#define RESOLUTION 250

// want to randomize the startup a little?
#define RANDOMIZE true

//----------
// Globals

// instantiate the Neopixel buffer array

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXELS, PIN_NEO, NEO_GRB + NEO_KHZ800);

uint32_t FullWhite = strip.Color(255,255,255);
uint32_t FullOff = strip.Color(0,0,0);
uint32_t MorseColor = strip.Color(255,191,0);

struct pixcolor_t {
	byte Prime;
	unsigned int NumSteps;
	unsigned int Step;
	float StepSize;
	byte MaxPWM;
};

unsigned int PlatterSteps;

byte PrimeList[] = {3,5,7,13,19,29};

// colors in each LED
enum pixcolors {RED, GREEN, BLUE, PIXELSIZE};

struct pixcolor_t Pixels[PIXELSIZE];								// all the data for each pixel color intensity

uint32_t UniColor;

unsigned long MillisNow;
unsigned long MillisThen;

// Morse code

LEDMorseSender Morse(PIN_MORSE, (float)MORSE_WPM);

uint8_t PrevMorse, ThisMorse;

//-- Figure PWM based on current state

byte StepColor(byte Color, float Phi) {

byte Value;

    Value = (Pixels[Color].MaxPWM / 2.0) * (1.0 + sin(Pixels[Color].Step * Pixels[Color].StepSize + Phi));

//	Value = (Value) ? Value : Pixels[Color].MaxPWM;					// flash at dimmest points

    return Value;
}


//-- Helper routine for printf()

int s_putc(char c, FILE *t) {
  Serial.write(c);
}

//------------------
// Set the mood

void setup() {

	pinMode(PIN_HEARTBEAT,OUTPUT);
	digitalWrite(PIN_HEARTBEAT,LOW);	// show we arrived

	Serial.begin(57600);
	fdevopen(&s_putc,0);				// set up serial output for printf()

	printf("Vacuum Tube Mood Light\r\nEd Nisley - KE4ZNU - September 2016\r\n");

  Entropy.initialize();         // start up entropy collector

// set up Neopixels

	strip.begin();
	strip.show();

// lamp test: a brilliant white flash

	printf("Lamp test: flash white\r\n");

	for (byte i=0; i<3 ; i++) {
		for (int j=0; j < strip.numPixels(); j++) {				// fill LEDs with white
			strip.setPixelColor(j,FullWhite);
		}
		strip.show();
		delay(500);

		for (int j=0; j < strip.numPixels(); j++) {				// fill LEDs with black
			strip.setPixelColor(j,FullOff);
		}
		strip.show();
		delay(500);
	}

// set up real random numbers

  uint32_t rn = Entropy.random();

	if (RANDOMIZE) {
    printf("Preloading LED array with seed: %08lx\r\n",rn);
    randomSeed(rn);
  }
	else {
		printf("Start not randomized\r\n");
  }
	printf("First random number: %ld\r\n",random(10));

// set up the color generators

  Pixels[RED].Prime = PrimeList[random(sizeof(PrimeList))];

  do {
    Pixels[GREEN].Prime = PrimeList[random(sizeof(PrimeList))];
  } while (Pixels[RED].Prime == Pixels[GREEN].Prime);

  do {
    Pixels[BLUE].Prime = PrimeList[random(sizeof(PrimeList))];
  } while (Pixels[BLUE].Prime == Pixels[RED].Prime ||
         Pixels[BLUE].Prime == Pixels[GREEN].Prime);

	printf("Primes: (%d,%d,%d)\r\n",Pixels[RED].Prime,Pixels[GREEN].Prime,Pixels[BLUE].Prime);

	Pixels[RED].MaxPWM = 255;
	Pixels[GREEN].MaxPWM = 255;
	Pixels[BLUE].MaxPWM = 255;

	for (byte c=0; c < PIXELSIZE; c++) {
		Pixels[c].NumSteps = RESOLUTION * (unsigned int) Pixels[c].Prime;
		Pixels[c].Step = RANDOMIZE ? random(Pixels[c].NumSteps) : (3*Pixels[c].NumSteps)/4;
		Pixels[c].StepSize = TWO_PI / Pixels[c].NumSteps;				// in radians per step

		printf("c: %d Steps: %d Init: %d",c,Pixels[c].NumSteps,Pixels[c].Step);
		printf(" PWM: %d\r\n",Pixels[c].MaxPWM);
	}

// set up Morse generator

	printf("Morse %d wpm\n",MORSE_WPM);
  Morse.setup();
  Morse.setMessage(String("       cq cq cq de ke4znu       "));
	PrevMorse = ThisMorse = digitalRead(PIN_MORSE);

  MillisNow = MillisThen = millis();

}

//------------------
// Run the mood

void loop() {

  if (!Morse.continueSending()) {
    Morse.startSending();
  }
  ThisMorse = digitalRead(PIN_MORSE);

	MillisNow = millis();
	if (((MillisNow - MillisThen) > UpdateMS) ||        // time for color change?
      (PrevMorse != ThisMorse)) {                     // Morse output bit changed?
		digitalWrite(PIN_HEARTBEAT,HIGH);

    if (ThisMorse) {                                  // if Morse output high, overlay
        strip.setPixelColor(PIXEL_MORSE,MorseColor);
    }
    PrevMorse = ThisMorse;
    strip.show();                                     // send out precomputed colors

		for (byte c=0; c < PIXELSIZE; c++) {				      // compute next increment for each color
			if (++Pixels[c].Step >= Pixels[c].NumSteps) {
				Pixels[c].Step = 0;
				printf("Cycle %d steps %d at %8ld delta %ld ms\r\n",c,Pixels[c].NumSteps,MillisNow,(MillisNow - MillisThen));
			}
		}

		byte Value[PIXELSIZE];
		for (byte c=0; c < PIXELSIZE; c++) {				//  ... for each color
			Value[c] = StepColor(c,0.0);					    // figure new PWM value
		}
		UniColor = strip.Color(Value[RED],Value[GREEN],Value[BLUE]);
		for (int j=0; j < strip.numPixels(); j++) {				// fill all LEDs with color
			strip.setPixelColor(j,UniColor);
		}

		MillisThen = MillisNow;
		digitalWrite(PIN_HEARTBEAT,LOW);
	}

}