Project showcase
Big Clock 2

Big Clock 2 © GPL3+

This clock has a big display for time, temperature and the date in a loop.

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Big Clock 2Arduino
New version
//  * Correction of Time with button on pin 9. pullUp on

#include <Wire.h> // Enable this line if using Arduino Uno, Mega, etc.
#include <Adafruit_GFX.h>
#include "Adafruit_LEDBackpack.h"

#define DS3231_I2C_ADDRESS 0x68

int buttonState = 0;         // proměnná pro čtení stavu tlačítka
int ldr = 0;                 //analogovy pin kde je pripojeno LDR + R 10kOhm na +
int ldr_value = 0; //variable to store LDR values
int bri = 15;


Adafruit_7segment matrix = Adafruit_7segment();

byte decToBcd(byte val){
return ( (val/10*16) + (val%10) );
}

byte bcdToDec(byte val){
return ( (val/16*10) + (val%16) );
}



void setup() {
  Serial.begin(9600); //spuštění serioveho rozhrani

  Wire.begin();
  matrix.begin(0x70);
 // set the initial time here:
  // DS3231 seconds, minutes, hours, day, date, month, year,,,, day of week (1=Sunday, 7=Saturday)
  // setDS3231time(0,33,14,6,20,1,18);
  }

void loop() {
    displayTime(); // display the real-time clock data 
    displayTemp(); // display the temperature
    bri = 5; // méně jasu
    ldr_value = analogRead(ldr); //čte hodnoty LDR
    Serial.println(ldr_value); //zobrazí hodnoty LDR na seriove lince
    if (ldr_value < 400 ) bri = 15; // více jasu
    matrix.setBrightness(bri); // 0 - 15
  
  }

  
void displayTime(){
 for (uint16_t counter = 0; counter < 10; counter++) {
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  getDateDs3231(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
    pinMode(9,INPUT_PULLUP);
    int tlac = 9;    
    tlac = !digitalRead(9);   //čtení tlačítka korekce a negace
    byte se = second;         //převod na pomocné proměnné
    byte mi = minute;
    byte ho = hour;
    byte we = dayOfWeek;
    byte dm = dayOfMonth;
    byte mo = month;
    byte ye = year;
    int kor = 2;
   
 //korekce sekund zpět              
if (tlac>0 && se<30) { setDS3231time(0,mi,ho,we,dm,mo,ye);}
   //korekce sekund vpřed               
if (tlac>0 && se>30) { setDS3231time(59,mi,ho,we,dm,mo,ye);}
 
   //změna času na letní - poslední neděle v březnu ve 2 hodiny
if ((dayOfWeek == 7)&&(dayOfMonth >= 25)&&(month == 3)&&(hour == 2)) {
setDS3231time(se,mi,3,we,dm,mo,ye); }   // nastavení hodin na 3 hodinu 
   //změna času na zimní  
if ((dayOfWeek == 7)&&(dayOfMonth >= 25)&&(month == 10)&&(hour == 1)&&(year != 1)) {
setDS3231time(se,mi,ho,we,dm,mo,1); }  //rok použit jako indikace, že bylo léto
   
if ((dayOfWeek == 7)&&(dayOfMonth >= 25)&&(month == 10)&&(hour == 3)&&(year == 1)) {
setDS3231time(se,mi,2,we,dm,mo,0);  } // nastavení hodin na 2 hodinu a příznak na 0
   // příznak je tam, aby se ve 3 hodiny znovu nenastavovalo na 2
   //------------------------------------------------------------------
    if ( se <= 30 ) kor = 10;
    if ( se > 30 ) kor = 6;
    if ( hour > 9 ) matrix.writeDigitNum(0, (hour / 10), false);
    matrix.writeDigitNum(1, (hour % 10), false); // this will write the number (0-9) to a single location 1
    matrix.drawColon(true); // 0x02 - center colon (both dots)
    matrix.writeDigitNum(3, (minute / 10), false);
    matrix.writeDigitNum(4,(minute % 10), false);
    matrix.writeDigitRaw(2,kor); // 2,3 double dot, 4,5 upper dot, 6,7 upper+double, 8,9 lower, 10,11 lower+double, 12 upper+lower
    matrix.writeDisplay();
    delay(500);
    matrix.drawColon(false);
    matrix.writeDisplay();
    delay(500);
    }    
  }


void displayTemp(){
  byte temp = get3231Temp();
  int temp2 = abs( temp );
  matrix.clear(); 
  matrix.writeDigitRaw(4,57); // 57 = " C "
  matrix.writeDigitRaw(3,99); // 99 = " ° "
  // matrix.writeDigitRaw(2,0x10); // decimal dot
  if (temp < 0) matrix.writeDigitRaw(0,64);  // and if the temperature is negative, we plot the minus sign to first place.
  if (temp <= -10 ) matrix.writeDigitRaw(2,12); 
  if ( temp >= 10 ) matrix.writeDigitNum(0, (temp2/10), false);     // position 0, value 1, show decimal)
  if ( temp <= -10 ) matrix.writeDigitNum(0, (temp2/10), false);     // position 0, value 1, show decimal)
  matrix.writeDigitNum(1,( temp2 % 10), false);   // position 1, value 9, show decimal)
  matrix.writeDisplay();
  Serial.println(temp); //zobrazí hodnoty teploty na seriove lince
  delay(5000);
 }

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 getDateDs3231(byte *second,
    byte *minute,
    byte *hour,
    byte *dayOfWeek,
    byte *dayOfMonth,
    byte *month,
    byte *year)
{
Wire.beginTransmission(DS3231_I2C_ADDRESS);
Wire.write(0);
Wire.endTransmission();

Wire.requestFrom(DS3231_I2C_ADDRESS, 7);

*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());
}

  float get3231Temp(){
  byte tMSB, tLSB;
  float temp3231;

Wire.beginTransmission(0x68);
Wire.write(0x11);
Wire.endTransmission();
Wire.requestFrom(0x68, 2);

  if(Wire.available()) {
    tMSB = Wire.read(); //2's complement int portion
    tLSB = Wire.read(); //fraction portion
    temp3231 = (tMSB & B01111111); //do 2's math on Tmsb
    temp3231 += ( (tLSB >> 6) * 0.25 ); //only care about bits 7 & 8
  }
  else {
    //oh noes, no data!
  }

  return temp3231;
}

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