Summary of AT89C4051 to work as a Real time Digital clock
This article describes a digital clock project utilizing the AT89C4051 microcontroller as a real-time clock. The system features a 16x2 LCD displaying day, date, and time with AM/PM indicators. Users can adjust settings via three switches connected to Port 3, while Port 1 handles LCD data lines. The design supports alternative chips like AT89C51 or AT89C52 if the primary chip is unavailable.
Parts used in the Digital Clock:
- AT89C4051 microcontroller
- 16 x 2 LCD display
- Switch 1
- Switch 2
- Switch 3
- Power supply module
- Keil C compiler
- AT89C51 microcontroller (alternative option)
- AT89C52 microcontroller (alternative option)
Its a digial clock which make use of AT89C4051 to work as a Real time clock.
Figure 1 shows the circuit diagram for the digital clock. Port 1 of the controller (AT89C4051) is used as the data lines for the LCD (starting from pin 7- pin14 of LCD). here i am using a 16 x 2 lines LCD display. In the first line, I’ll display “DAY” and “DATE”, in the second line, i am displaying “TIME” with am/pm.
Port 3 is used for the clock setting and it also provides the necessary control signals for the LCD. As shown in the diagram, switch3 will be used to select the parameter which need to be changed, switch 1 and 2, are used to increase or decrease the selected parameter value.
When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value.
The source code for the project is written in C-language, and compiled using Keil C compiler, you can download the c-code, schematic, and if you don’t have a cross compiler then you can directly burn the HEX file on to your chip,clock.zip.
Figure 2 shows a screenshot of the Digital Clock.
NOTE: If you think that there is a problem in the availability of the chip mentioned in the schematic, then you can also use AT89C51/AT89C52, make sure that you are using the same port for LCD and switches which are there in the C-file or in the schematic.
The schematic contains the power supply module also, which is not shown in the figure above.
For any help regarding the project please mail me anytime.
For more detail: AT89C4051 to work as a Real time Digital clock
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What components are used for the display?
A 16 x 2 lines LCD display is used to show DAY, DATE, TIME, and am/pm. -
How do I change the time and date settings?
Use switch 3 to select the parameter and switches 1 and 2 to increase or decrease the value. -
Which ports on the controller are utilized?
Port 1 serves as data lines for the LCD, while Port 3 manages clock settings and control signals. -
Can I use an alternative microcontroller?
Yes, you can use AT89C51 or AT89C52 provided you keep the same port configuration for LCD and switches. -
What programming language is used for the source code?
The source code is written in C-language and compiled using the Keil C compiler. -
What happens when the power supply is switched on?
The device displays the default date and time initially before allowing user adjustments.
