Real Time Clock Module

1Introduce:

  This Arduino Tiny RTC I2C module incorporates the DS1307 I2C real time clock IC and the 24C32 32K I2C EEPROM storage. What's more, it has a DS18B20 temperature sensor on board.

2Arduino Tiny RTC I2C Real Time Clock Pinout:

The I2C wires "SDA" and "SCL" are the data line and clock line, they should be connected to the corresponding pins depending on the Arduino board.

3.Example 

 There are three examples code for the RTC , the EEPROM, and the DS18B20 temperature sensor.

Only the DS18B20 temperature sensor’s example, the DS pinout is used.

Wire connection as below:

First example for the RTC:

#include 
#include 

void printDateTime(DateTime dateTime);

RTC_DS1307 RTC;

void setup (void){
  Serial.begin(9600);
  Wire.begin();
  RTC.begin();   
    
}

void loop() {
  if (Serial.available() > 0) {

    int instruct = Serial.read();

    switch (instruct) {
    case 'D': {
      DateTime now = RTC.now();
            
      printDateTime(now);
      break;
    } case 'S':
      RTC.set(RTC_MONTH, 6);
      RTC.set(RTC_HOUR, 16);
      break;
    }
  }
}

void printDateTime(DateTime dateTime) {
    Serial.print(dateTime.year(), DEC);
    Serial.print('/');
    Serial.print(dateTime.month(), DEC);
    Serial.print('/');
    Serial.print(dateTime.day(), DEC);
    Serial.print(' ');
    Serial.print(dateTime.hour(), DEC);
    Serial.print(':');
    Serial.print(dateTime.minute(), DEC);
    Serial.print(':');
    Serial.print(dateTime.second(), DEC);
    Serial.println();
}

Second example for the EEPROM:

#include 
#include 
#include 

AT24Cxx AT24C32(0x50);
RTC_DS1307 RTC;

void setup (void){
  Serial.begin(9600);
  Wire.begin();
  RTC.begin(); 

}

void loop() {
  if (Serial.available() > 0) {
    int instruct = Serial.read();

    switch (instruct) {
    case 'P': 
      {
        AT24C32.WriteMem(0, 0x04);
        break;
      } 
    case 'G': 
      {
        char buffer[3];
        AT24C32.ReadMem(0, buffer, 3);
        Serial.print(2000 + buffer[2], DEC);
        Serial.print('/');
        Serial.print(buffer[1], DEC);
        Serial.print('/');
        Serial.print(buffer[0], DEC);
        Serial.println();
        break;
      } 
    case 'F': 
      {
        DateTime now = RTC.now();
        char buffer[3];
        buffer[0] = now.day();
        buffer[1] = now.month();
        buffer[2] = now.year() - 2000;
        AT24C32.WriteMem(0, buffer, 3);
        break;
      }
    }
  }
}

Third example for the LM75:

#include 
#include 

LM75 sensor(LM75_ADDRESS | 0b000);
const int OSPIN = 6;

void setup (void){
  pinMode(OSPIN, INPUT); 
  
  Serial.begin(9600);
  Wire.begin();
  sensor.tos(47.5); 
  sensor.thyst(42);

}

void loop() {
  if (Serial.available() > 0) {
    int instruct = Serial.read();
    int OSValue = HIGH;
    OSValue = digitalRead(OSPIN);
    if (OSValue == LOW)
        Serial.println("Over heating!");

    switch (instruct) {
    case 'T':
      Serial.print("Current temp: ");
      Serial.print(sensor.temp());
      Serial.println(" C");
      break;
    }
  }
}