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NeoClock.ino
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NeoClock.ino
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//NeoPixel
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
#include <avr/power.h>
#endif
//RTC
#include "Wire.h"
#define DS3231_I2C_ADDRESS 0x68
//Gamma correction table
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, 0, 0, 0, 0, 1, 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, 3, 4, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 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, 32, 32, 33, 34, 35, 35, 36,
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 };
//Monthly tables for sunrise og sunset.
const uint8_t sunrise[] = {521, 465, 395, 374, 306, 271, 296, 349, 410, 470, 476, 525};
const uint8_t sunset[] = {976, 1042, 1102, 1226, 1286, 1328, 1316, 1257, 1177, 1099, 971, 943};
//Transition time for changing brightness (in minutes). Total time from base to max is tTime*2
const int tTime = 60;
//Minimum and maximum brightness %.
const int minBrightness = 00;
const int maxBrightness = 100;
//NeoPixel pin
#define PIN 2
//Amount of neopixels
#define NUMPIXELS 3
#define LDRPIN A7
// When we setup the NeoPixel library, we tell it how many pixels, and which pin to use to send signals.
// Note that for older NeoPixel strips you might need to change the third parameter--see the strandtest
// example for more information on possible values.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
byte decToBcd(byte val)
{
return( (val/10*16) + (val%10) );
}
// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
return( (val/16*10) + (val%16) );
}
void setup() {
Wire.begin();
pixels.begin(); // This initializes the NeoPixel library.
pixels.setBrightness(100);
// set the initial time here:
// DS3231 seconds, minutes, hours, day, date, month, year
// setDS3231time(40,24,16,7,3,12,17);
}
void setDS3231time(byte second, byte minute, byte hour, byte dayOfWeek, byte
dayOfMonth, byte month, byte year)
{
// sets time and date data to DS3231
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set next input to start at the seconds register
Wire.write(decToBcd(second)); // set seconds
Wire.write(decToBcd(minute)); // set minutes
Wire.write(decToBcd(hour)); // set hours
Wire.write(decToBcd(dayOfWeek)); // set day of week (1=Sunday, 7=Saturday)
Wire.write(decToBcd(dayOfMonth)); // set date (1 to 31)
Wire.write(decToBcd(month)); // set month
Wire.write(decToBcd(year)); // set year (0 to 99)
Wire.endTransmission();
}
void readDS3231time(byte *second,
byte *minute,
byte *hour,
byte *dayOfWeek,
byte *dayOfMonth,
byte *month,
byte *year)
{
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0); // set DS3231 register pointer to 00h
Wire.endTransmission();
Wire.requestFrom(DS3231_I2C_ADDRESS, 7);
// request seven bytes of data from DS3231 starting from register 00h
*second = bcdToDec(Wire.read() & 0x7f);
*minute = bcdToDec(Wire.read());
*hour = bcdToDec(Wire.read() & 0x3f);
*dayOfWeek = bcdToDec(Wire.read());
*dayOfMonth = bcdToDec(Wire.read());
*month = bcdToDec(Wire.read());
*year = bcdToDec(Wire.read());
}
uint32_t mapToColor(int pos){
int red;
int green;
int blue;
if (pos <= 60){
red = 255;
green = map(pos,0,60,0,255);
blue = 0;
}else if (pos <= 120){
red = map(pos,60,120,255,0);
green = 255;
blue = 0;
}else if (pos <= 180){
red = 0;
green = 255;
blue = map(pos,120,180,0,255);
}else if (pos <= 240){
red = 0;
green = map(pos,180,240,255,0);
blue = 255;
}else if (pos <= 300){
red = map(pos,240,300,0,255);
green = 0;
blue = 255;
}else if (pos <= 360){
red = 255;
green = 0;
blue = map(pos,300,360,255,0);
}
return pixels.Color(gamma[red], gamma[green], gamma[blue]);
}
int calcBrightness(int month, int hour, int minute){
int lmonth = month-1;
int sr = sunrise[lmonth];
int ss = sunset[lmonth];
int brightness = minBrightness;
int cTime = hour*60+minute;
if (cTime >= sr-tTime && cTime < sr+tTime){
brightness = map(cTime,sr-tTime,sr+tTime,minBrightness,maxBrightness);
}
else if (cTime >= sr+tTime && cTime < ss-tTime){
brightness = maxBrightness;
}
else if (cTime >= ss-tTime && cTime < ss+tTime){
brightness = map(cTime,sr-tTime,sr+tTime,maxBrightness,minBrightness);
}
return brightness;
}
int getLDRBrightness(){
int lSensor = analogRead(LDRPIN);
int brightness = map(lSensor, 0, 1023, minBrightness, maxBrightness);
return brightness;
}
void loop() {
byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
// retrieve data from DS3231
readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
uint32_t secondColor = mapToColor(map(second, 0, 60, 0, 360));
uint32_t minuteColor = mapToColor(map(minute, 0, 60, 0, 360));
uint32_t hourColor = mapToColor(map(hour % 12, 0, 24, 0, 360));
// pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
pixels.setPixelColor(0, secondColor);
pixels.setPixelColor(1, minuteColor);
pixels.setPixelColor(2, hourColor);
pixels.show(); // This sends the updated pixel color to the hardware.
//If new minute, calculate new brightness and set it.
/*if (second == 0){
pixels.setBrightness(calcBrightness(month, hour, minute));
}*/
pixels.setBrightness(getLDRBrightness());
delay(1000); // Delay for a second
}