Arduino / LCD shield / RTC3231

Zapojeno LCD shield a k tomu RTC3231

Návrh na vylepšení – datum převést na 4 místný formát ( 18 -> 2018 ) a ostatní čísla na 2 místný (2 -> 02)

//Sample using LiquidCrystal library
#include <LiquidCrystal.h>
#include "Wire.h"
#define DS3231_I2C_ADDRESS 0x68


// select the pins used on the LCD panel
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);





// define some values used by the panel and buttons
int lcd_key     = 0;
int adc_key_in  = 0;
#define btnRIGHT  0
#define btnUP     1
#define btnDOWN   2
#define btnLEFT   3
#define btnSELECT 4
#define btnNONE   5



// Convert normal decimal numbers to binary coded decimal
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();
 Serial.begin(9600);
    // set the initial time here:
    // DS3231 seconds, minutes, hours, day, date, month, year
    // setDS3231time(30,42,21,4,26,11,14);
 
 lcd.begin(16, 2);              // start the library
 lcd.setCursor(0,0);

}






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());
}



void displayTime(){
    byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
    // retrieve data from DS3231
    readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
    // send it to the serial monitor
    Serial.print(hour, DEC);
    // convert the byte variable to a decimal number when displayed
    Serial.print(":");
    if (minute<10){
        Serial.print("0");
    }
    Serial.print(minute, DEC);
    Serial.print(":");
    if (second<10){
        Serial.print("0");
    }
    Serial.print(second, DEC);
    Serial.print(" ");
    Serial.print(dayOfMonth, DEC);
    Serial.print("/");
    Serial.print(month, DEC);
    Serial.print("/");
    Serial.print(year, DEC);
    Serial.print(" Day of week: ");
    switch(dayOfWeek){
        case 1:
            Serial.println("Sunday");
            break;
        case 2:
            Serial.println("Monday");
            break;
        case 3:
            Serial.println("Tuesday");
            break;
        case 4:
            Serial.println("Wednesday");
            break;
        case 5:
            Serial.println("Thursday");
            break;
        case 6:
            Serial.println("Friday");
            break;
        case 7:
            Serial.println("Saturday");
            break;
    }
}

void send_time_to_LCD(){
 byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
 // retrieve data from DS3231
 readDS3231time(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);

 lcd.print(dayOfMonth);
 lcd.print(".");
 lcd.print(month);
 lcd.print("."); 
 lcd.print(year);
 lcd.print("  ");
 lcd.print(hour); 
 lcd.print(":");
 lcd.print(minute); 
 
} 

 
void loop()
{
 lcd.clear();
 lcd.setCursor(0,0);            // move cursor to second line "1" and 9 spaces over
 //lcd.print(millis()/1000);      // display seconds elapsed since power-up

 send_time_to_LCD();
 displayTime(); // display the real-time clock data on the Serial Monitor,
 delay(5000); // every 5seconds


}