Animated clock based on zeroeth's time loop, with added GPS and orientation adjustment:
//NeoPixel clock with FLORA based on Kevin Alford's NeoPixel ring clock face
//https://github.com/zeroeth/time_loop
//http://www.youtube.com/watch?v=b-mROp-ZKuk
//modified by Becky Stern for Adafruit Industries
#include <Adafruit_NeoPixel.h>
#include <Time.h>
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
#include <Wire.h>

Adafruit_GPS GPS(&Serial1);

#define PIN 12

// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO false
     
// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;

// From adaFruit NEOPIXEL goggles example: Gamma correction improves appearance of midrange colors
const uint8_t gamma[] = {
      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
      0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  1,  1,
      1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,  2,  3,  3,  3,  3,
      3,  3,  4,  4,  4,  4,  5,  5,  5,  5,  5,  6,  6,  6,  6,  7,
      7,  7,  8,  8,  8,  9,  9,  9, 10, 10, 10, 11, 11, 11, 12, 12,
     13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20,
     20, 21, 21, 22, 22, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29,
     30, 31, 31, 32, 33, 34, 34, 35, 36, 37, 38, 38, 39, 40, 41, 42,
     42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
     58, 59, 60, 61, 62, 63, 64, 65, 66, 68, 69, 70, 71, 72, 73, 75,
     76, 77, 78, 80, 81, 82, 84, 85, 86, 88, 89, 90, 92, 93, 94, 96,
     97, 99,100,102,103,105,106,108,109,111,112,114,115,117,119,120,
    122,124,125,127,129,130,132,134,136,137,139,141,143,145,146,148,
    150,152,154,156,158,160,162,164,166,168,170,172,174,176,178,180,
    182,184,186,188,191,193,195,197,199,202,204,206,209,211,213,215,
    218,220,223,225,227,230,232,235,237,240,242,245,247,250,252,255
};

// Parameter 1 = number of pixels in strip
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_RGB     Pixels are wired for RGB bitstream
//   NEO_GRB     Pixels are wired for GRB bitstream
//   NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
//   NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(36, PIN, NEO_GRB + NEO_KHZ800);

//--------------------------------------------------|
//Your NeoPixel rings may not line up with ours, or each other.     |
//Enter which NeoPixel leds are on top LED (0-23 and 0-13).  |
  #define outerTOP_LED                10
  #define innerTOP_LED                5
//--------------------------------------------------|

int outertopLED = outerTOP_LED;
int innertopLED = innerTOP_LED;
float fLat = 0.0;
float fLon = 0.0;

//tequila sunrise color scheme

uint32_t milli_color  = strip.Color ( 44,  21,  0); // redest orange
uint32_t second_color = strip.Color (  44,  30, 0); //slightly yellower
uint32_t hour_color   = strip.Color (  44, 42,  0); //yellow
uint32_t minute_color = strip.Color ( 43, 0, 5); //red
uint32_t off_color    = strip.Color (  0,  0,  0);


//blue, green, & purple color scheme
/*
uint32_t milli_color  = strip.Color ( 24,  0,  24); // magenta
uint32_t second_color = strip.Color (  17,  0, 44); // purple
uint32_t hour_color   = strip.Color (  0, 10,  44); // royal blue
uint32_t minute_color = strip.Color ( 0, 44, 10); // green
uint32_t off_color    = strip.Color (  0,  0,  0);
*/

// Offset hours from gps time (UTC)
//const int offset = 1;   // Central European Time
const int offset = -4;  // Eastern Daylight Time (USA)
//const int offset = -5;  // Central Daylight Time (USA)
//const int offset = -8;  // Pacific Standard Time (USA)
//const int offset = -7;  // Pacific Daylight Time (USA)

/* CLOCK */
class ClockPositions
{
 public:
 
  uint8_t milli;
  uint8_t currentsecond;
  uint8_t currentminute;
  uint8_t currenthour;


  ClockPositions ();
  void update    ();
};


ClockPositions::ClockPositions()
{
  /*
  milli = 0;
  second = 0;
  minute = 30;
  hour = 6;
  */
  //DateTime(__DATE__, __TIME__);
  
}


void ClockPositions::update()
{
  
  if (GPS.fix) {
      // set the Time to the latest GPS reading
      setTime(GPS.hour, GPS.minute, GPS.seconds, GPS.day, GPS.month, GPS.year);
      delay(50);
      adjustTime(offset * SECS_PER_HOUR);
      
      delay(100);
    }
    
  currentsecond = outertopLED + map ((second() % 60), 0, 60, 0, 23);
  if (currentsecond > 24) {currentsecond = currentsecond-24;};
  milli  = map ((millis() %  1000), 0,  1000, 0, 24);
  currenthour   = innertopLED + map ((hour() % 12), 0,  12, 24, 35);
  if (currenthour > 35) { currenthour = currenthour-12;}
  //Serial.print("the hour is: ");
  //Serial.println(hour());
  currentminute = outertopLED + map (minute() % 60, 0,  60, 0, 23);
  if (currentminute > 23) {currentminute = currentminute-24;};
  //Serial.print("the minute is: ");
  //Serial.println(minute());
}



/* CLOCK VIEW */

class ClockSegments
{
 public:
  ClockPositions    &positions;
  Adafruit_NeoPixel &strip;

  ClockSegments (Adafruit_NeoPixel&, ClockPositions&);
  void draw  ();
  void clear ();
  void add_color (uint8_t position, uint32_t color);
  uint32_t blend (uint32_t color1, uint32_t color2);
};


ClockSegments::ClockSegments (Adafruit_NeoPixel& n_strip, ClockPositions& n_positions): strip (n_strip), positions (n_positions)
{
}


void ClockSegments::draw()
{
  clear();

  add_color (positions.currentminute,  minute_color);
  //Serial.println(positions.minute);
  add_color (positions.currenthour,  hour_color  );


  add_color (positions.currentsecond     % 24, second_color);
  add_color ((positions.currentsecond+1) % 24, second_color);
  //add_color ((positions.second+2) % 24, second_color);

/*
  add_color (positions.milli     % 24,  milli_color);
  add_color ((positions.milli+1) % 24,  milli_color);
  add_color ((positions.milli+2) % 24,  milli_color);
*/
  strip.show ();
}


void ClockSegments::add_color (uint8_t position, uint32_t color)
{
  uint32_t blended_color = blend (strip.getPixelColor (position), color);

  /* Gamma mapping */
  uint8_t r,b,g;

  r = (uint8_t)(blended_color >> 16),
  g = (uint8_t)(blended_color >>  8),
  b = (uint8_t)(blended_color >>  0);

  strip.setPixelColor (position, blended_color);
}


uint32_t ClockSegments::blend (uint32_t color1, uint32_t color2)
{
  uint8_t r1,g1,b1;
  uint8_t r2,g2,b2;
  uint8_t r3,g3,b3;

  r1 = (uint8_t)(color1 >> 16),
  g1 = (uint8_t)(color1 >>  8),
  b1 = (uint8_t)(color1 >>  0);

  r2 = (uint8_t)(color2 >> 16),
  g2 = (uint8_t)(color2 >>  8),
  b2 = (uint8_t)(color2 >>  0);


  return strip.Color (constrain (r1+r2, 0, 255), constrain (g1+g2, 0, 255), constrain (b1+b2, 0, 255));
}


void ClockSegments::clear ()
{
  for(uint16_t i=0; i<strip.numPixels (); i++) {
      strip.setPixelColor (i, off_color);
  }
}



/* SIMPLE MIXER */
// add rgb and clamp





/* APP */
ClockPositions positions;
ClockSegments  segments(strip, positions);

void setup ()
{
 
   
  // connect at 115200 so we can read the GPS fast enough and echo without dropping chars
  // also spit it out
  Serial.begin(115200);
  Serial.println("Adafruit GPS library basic test!");
     
  // 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
  GPS.begin(9600);
  // uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
  GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
  // uncomment this line to turn on only the "minimum recommended" data
  //GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
  // For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
  // the parser doesn't care about other sentences at this time
  // Set the update rate
  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
  // For the parsing code to work nicely and have time to sort thru the data, and
  
  // print it out we don't suggest using anything higher than 1 Hz
     
  // Request updates on antenna status, comment out to keep quiet
  GPS.sendCommand(PGCMD_ANTENNA);
  
  delay(1000);
  // Ask for firmware version
  Serial1.println(PMTK_Q_RELEASE);
  
  strip.begin ();
  strip.show (); // Initialize all pixels to 'off'
}

uint32_t gpsTimer = millis();
uint32_t startupTimer = millis();

void loop ()
{
 
  // read data from the GPS in the 'main loop'
  char c = GPS.read();
  // if you want to debug, this is a good time to do it!
  if (GPSECHO)
    //if (c) Serial.print(c);
  // if a sentence is received, we can check the checksum, parse it...
  if (GPS.newNMEAreceived()) {
    // a tricky thing here is if we print the NMEA sentence, or data
    // we end up not listening and catching other sentences!
    // so be very wary if using OUTPUT_ALLDATA and trytng to print out data
    //Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
    if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
      return; // we can fail to parse a sentence in which case we should just wait for another
  }
  
  // if millis() or timer wraps around, we'll just reset it
  if (gpsTimer > millis()) gpsTimer = millis();

    //if (GPS.fix) {
      // set the Time to the latest GPS reading
      setTime(GPS.hour, GPS.minute, GPS.seconds, GPS.day, GPS.month, GPS.year);
      delay(50);
      adjustTime(offset * SECS_PER_HOUR);
    Serial.print("\nTime: ");
    Serial.print(GPS.hour, DEC); Serial.print(':');
    Serial.print(GPS.minute, DEC); Serial.print(':');
    Serial.print(GPS.seconds, DEC); Serial.print('.');
    Serial.println(GPS.milliseconds);
      delay(100);
    //}
      
  // approximately every 60 seconds or so, update time
  if ((millis() - gpsTimer > 60000)) {
    gpsTimer = millis(); // reset the timer
    if (GPS.fix) {
      // set the Time to the latest GPS reading
      setTime(GPS.hour, GPS.minute, GPS.seconds, GPS.day, GPS.month, GPS.year);
      delay(50);
      adjustTime(offset * SECS_PER_HOUR);
      
      delay(100);
    }
  }
  
  positions.update ();
  segments.draw ();
  
}




// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint32_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, c);
      strip.show();
      delay(wait);
  }
}

// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
    for(i=0; i< strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  if(WheelPos < 85) {
   return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if(WheelPos < 170) {
   WheelPos -= 85;
   return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
   WheelPos -= 170;
   return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}

This guide was first published on Feb 12, 2014. It was last updated on Feb 12, 2014.

This page (Code and Clock Faces) was last updated on Dec 01, 2021.

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