The RTC DS13072 is a high-precision, low-power real-time clock and calendar chip designed by Electronics Hut. It is engineered to maintain accurate time and date information, functioning even when the primary device power is off. This component is ideal for applications such as embedded systems, data loggers, clocks, and smart devices where timekeeping is crucial.
This circuit integrates an Arduino UNO with a DS1307 Real-Time Clock (RTC) module to keep track of the current date and time. The Arduino communicates with the RTC via I2C (SDA and SCL lines) and displays the time on the serial monitor, ensuring accurate timekeeping even during power outages.
Open Project in Cirkit Designer
This circuit features an Arduino UNO connected to a DS1307 Real Time Clock (RTC) module for timekeeping and a red LED with a series resistor for indication purposes. The Arduino communicates with the RTC via I2C (using A4 and A5 pins for SDA and SCL, respectively), and controls the LED connected to digital pin D8 through a 330-ohm resistor. The embedded code sets the RTC time, checks the current time, and turns the LED on or off based on the specified time condition (between 11:00 AM and 11:43 AM).
Open Project in Cirkit Designer
This circuit features an Arduino UNO microcontroller connected to a DS3231 Real Time Clock (RTC) module and a 12V single-channel relay. The Arduino provides power to both the RTC and the relay, and it communicates with the RTC via I2C using the SDA and SCL lines connected to A4 and A5 respectively. The relay is controlled by the Arduino through a digital output on pin D13, allowing the Arduino to switch external loads on and off based on time events managed by the RTC.
Open Project in Cirkit Designer
This circuit interfaces an Arduino UNO with a DS1307 Real-Time Clock (RTC) module. The Arduino communicates with the RTC module using the I2C protocol, with connections from A4 to SDA and A5 to SCL.
Open Project in Cirkit Designer| Pin Number | Name | Description |
|---|---|---|
| 1 | VCC | Power supply pin (2.0V to 5.5V) |
| 2 | GND | Ground pin |
| 3 | SDA | Serial Data for I2C interface |
| 4 | SCL | Serial Clock for I2C interface |
| 5 | MOSI | Master Out Slave In for SPI interface |
| 6 | MISO | Master In Slave Out for SPI interface |
| 7 | SCLK | Serial Clock for SPI interface |
| 8 | /CS | Chip Select for SPI interface |
#include <Wire.h> // Include Wire library for I2C communication
// RTC DS13072 I2C address
#define DS13072_I2C_ADDRESS 0x68
void setup() {
Wire.begin(); // Initialize I2C communication
Serial.begin(9600); // Start serial communication at 9600 baud rate
// Set initial time and date here if needed
}
void loop() {
Wire.beginTransmission(DS13072_I2C_ADDRESS); // Start I2C transmission
Wire.write(0); // Set DS13072 register pointer to 00h
Wire.endTransmission();
Wire.requestFrom(DS13072_I2C_ADDRESS, 7); // Request 7 bytes of data
// Read data from the RTC and print it
if (Wire.available() == 7) {
// Convert the byte data to num
int second = bcdToDec(Wire.read() & 0x7F);
int minute = bcdToDec(Wire.read());
int hour = bcdToDec(Wire.read() & 0x3F);
int dayOfWeek = bcdToDec(Wire.read());
int dayOfMonth = bcdToDec(Wire.read());
int month = bcdToDec(Wire.read());
int year = bcdToDec(Wire.read());
// Print the date and time
Serial.print(year);
Serial.print("/");
Serial.print(month);
Serial.print("/");
Serial.print(dayOfMonth);
Serial.print(" ");
Serial.print(hour);
Serial.print(":");
Serial.print(minute);
Serial.print(":");
Serial.println(second);
}
delay(1000); // Wait for a second
}
// Convert binary coded decimal to normal decimal numbers
int bcdToDec(byte val) {
return (int)((val / 16 * 10) + (val % 16));
}
Q: Can the RTC DS13072 be used with both 3.3V and 5V systems? A: Yes, the RTC DS13072 operates within a range of 2.0V to 5.5V, making it compatible with both 3.3V and 5V systems.
Q: How long can the RTC keep time with a battery backup? A: The battery life depends on the quality and capacity of the coin cell used. With a typical 3V coin cell and the low backup current of the DS13072, it can last for several years.
Q: Is it necessary to use an external crystal with the DS13072? A: The DS13072 typically has an integrated crystal. However, check the specific module from Electronics Hut to confirm if an external crystal is needed or already included.