![]() The I2C communication protocol used in the module makes connections to the Arduino board very easy. The DS3231 module (front and back) used in this project is shown in Fig. The battery input is 3V, and a typical CR2032 3V battery can power the module and maintain the information for more than a year. The module can work on either 3.3V or 5V, which makes it suitable for many development platforms or microcontrollers. It has automatic compensation for leap years for and months with less than 31 days. The DS3231 module is a low-cost, highly accurate real-time clock that can maintain time in hours, minutes, and seconds as well as the day, month, and year information. The data connection is based on the I2C (inter-integrated circuit) interface, which is also known as TWI (two wire interface). The display module connects to Arduino using four wires-two for power and another two for data- making the wiring very simple. ![]() It is easily available in the market as well as online stores. It is mainly used in such digital display devices as computer monitors, mobile phones, hand-held video games, and television screens. ![]() It is more efficient and reliable as compared to a simple LCD display. It has improved image quality, full viewing angle, high brightness, better contrast, wide colour range, and low power consumption. The OLED display used in this project is shown in Fig. OLED (organic light-emitting diode) is a flat light emitting device developed with organic thin films that are connected in series between two electric conductors. 3: Circuit diagram of Arduino based real-time clock (Pins A4, A5, 5V of Board1) SSD1306 OLED display It is built around Arduino Uno (Board1), 5V regulator 7805 (IC1), 2.4cm SSD1306 OLED display (DIS1), DS3231 RTC module (RTC1), and a few other components. 2: Block diagram of the project Circuit and workingĬircuit diagram of the Arduino real-time clock with temperature display is shown in Fig.
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