Introduction: Real TIme Clock Using AT89s52

About: I am hobbies, educator, learner, and developer in various programming languages and Electronic hardware's. I also won the Smart India Hackathon 2019 Competition organized by the Government of India. I am very…

WELCOME BACK, This is shubham Trivedi and today I am going to design the Real Time Clock using At89s52 Microcontroller. The AT89S52 Microcontroller is the heart of this project. DS1307 IC is used as RTC. This DS1307 IC required I2C interface, but 89s52 is not had any I2C port on board. That makes it typical to designed. So I designed an I2C bus in the program and used it to fulfill the requirements.

Components Required:

  1. DS1307
  2. AT89S52 Board
  3. 16x2 LCD
  4. Connecting wires
  5. Breadboard

Step 1: Construction

The circuit is designed in two separate parts. Fig. 1 Shows the RTC DS 1307 IC connection. This connection is done by using zero PCB. The connection is same as shown in Fig. 2.

I used AT89s52 Development Board which i designed few months ago using Screen print technique for pcb design. The SCL pin of RTC is connected to pin P1.1 and SDA pin is connected to pin P1.0 of 89s52 microcontroller. LCD 16x2 is interfaced in following way.


  • D7 - P3.7
  • D6 - P3.6
  • D5 - P3.5
  • D4 - P3.4
  • RS - P1. 6
  • RW - P1. 5
  • E - P1.4

Step 2: Working Video

Step 3: Code


Program is designed in Keil uvision 5 software. Separate library files are used for each interface. please go through the readme file before proceed further. The description of each function is also available in this attachment

Click here to download attachment

errors are welcome at

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