Project Description
Our project is centered around the creation of a precise timekeeping system using decade counter integrated circuits (ICs), with initial design and simulation carried out in Logisim Evolution and further development in EasyEDA to facilitate PCB creation and Proteus simulations as well. The primary objective is to implement a reliable mechanism for displaying the current time, including seconds. The project incorporates six 7-segment digits, each driven by decade counters, to represent hours, minutes, and seconds individually. Leveraging these ICs ensures accurate time tracking through the efficient division of clock pulses. With the design transitioned to EasyEDA, we aim to streamline the PCB development process, allowing for the efficient production of circuit boards. This project not only provides a functional and visually appealing time display solution but also emphasizes ease of fabrication through the utilization of EasyEDA for PCB design. Below is a list of all components used for the project.
Components Used
- ICs (e.g., 74LS192): These IC counters that divide the clock pulses to count seconds, minutes, and hours. The IC components also include D-flip-flops, and some logic gates
- 7-Segment Display Modules: Six segment modules are used to visually represent the hours, minutes, and seconds. Two for each
- Crystal Oscillator: Provides a stable clock signal for accurate timekeeping.
- Resistors and Capacitors: Used for timing, current limiting, and voltage division in the circuit.
- LEDs: Individual LEDs within the 7-segment displays to form the numeric characters.
- PCB (Printed Circuit Board): Designed using EasyEDA to host and interconnect all components.
- Connectors and Headers: Facilitate easy connections between the PCB and external elements.
- Power Supply Components: Voltage regulators, capacitors, and diodes to ensure stable power delivery.
- Clock Source (e.g., 555 Timer IC): Generates clock pulses for the system.
- EasyEDA Software: Utilized for PCB design, schematic capture, and layout.
Personal PCB Designs
Design Process
The design of a digital clock circuit involves the orchestrated collaboration of six-decade counters, each assigned a specific role in the precision timekeeping system. The seconds display, utilizing a 0-9 decade counter, initiates its count through clock pulses generated by the NE555 timer IC. Transmitting a signal to a second counter, c onfigured from 0-5, ensures an increment every ten seconds. Upon reaching 60 seconds, a signal triggers the minutes display, seamlessly transitioning the countdown. The minutes and hour displays follow suit, harmonizing their counts and simulating a twelve-hour clock format. Notably, practical features include a buzzer that sounds every fifteen minutes and an LED that lights for 4 seconds, enhancing user engagement. The output of the counters are connected to a BCD to seven segment deocder before and then to the seven segment display to display the time. Additionally, a rectifier and voltage regulator circuit guarantee a stable 5V power supply from the mains, underpinning the clock's robust functionality.
Team Members
This project was collaboratively developed in a group, leveraging the diverse skills and expertise of team members.
