Arduino Wemos D1 Basic Jam Digtal RTC DS3231

Arduino Wemos D1 Basic Jam Digtal RTC DS3231

              Pada kesempatan kali ini saya akan menjelaskan mengenai bagaimana cara membuat sebuah alat dengan menggunakan board Wemos D1 sebagai pengendali jam digital dengan menggunakan modul Ds3231 dengan interface yang digunakan adalah lcd 16x2 + I2c. alat ini adalah basic pembelajaran mikrokontroller, jika sudah bisa menguasai alat ini maka dapat lanjut ke level berikutnya dengan lebih mudah. untuk lebih jelasnya berikut adalah program dan daftar komponennya.

a. Wemos D1

b. Modul RTC DS3231

c. Lcd 16x2 + I2C

d. Program Arduino IDE

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define DS3231_I2C_ADDRESS 0x68

LiquidCrystal_I2C lcd(0x27, 16, 2);

int btsetx;
int btupx;
int btdownx;
int btokx;
int jam;

byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;

// 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()
{
  lcd.begin();
  lcd.clear();
  lcd.noCursor();
 
  Wire.begin();
  Serial.begin(9600);
  // DS3231 seconds, minutes, hours, day, date, month, year
  // setDS3231time(0,46,16,6,5,10,18);
}

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()
{

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

  lcd.setCursor(0,0);
  // send it to the serial monitor
  lcd.print(hour, DEC);
  // convert the byte variable to a decimal number when displayed
  lcd.print(":");
  if (minute<10)
  {
    lcd.print("0");
  }
  lcd.print(minute, DEC);
  lcd.print(":");
  if (second<10)
  {
    lcd.print("0");
  }
  lcd.print(second, DEC);
   
}

void loop()
{
  displayTime();
  delay(1000);

} 





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