A four-way quiz buzzer system based on CD4511

This system features a four-way answer-grabbing function, with reset and latching capabilities.
The engineering description of the CD4511-
based four-way answer-grabbing device for digital tube displays is as follows: 1. Hardware Design: The core of the system is a four-way answer-grabbing device composed of the CD4511 integrated circuit. The CD4511 is a BCD-to-seven-segment decoder used to drive common-cathode LED (digital tube) displays. It has BCD conversion, blanking and latching control, seven-segment decoding, and driving functions. In addition, the entire system also includes a decoding display circuit and an answer-grabbing encoding circuit.
2. Design of Logic Function Expressions: Based on Karnaugh map simplification, the logic function expressions for outputs a, b, c, d and inputs A, B, C, D are: a = A + C, b = B + C, c = D, d = 0.
3. Software Design: Although this problem mainly focuses on hardware design, the role of software cannot be ignored. For example, it implements functions such as latching for priority answering and driving LED digital displays with decoded outputs.
4. System Testing: After completing the above steps, the system needs to be tested to ensure it functions properly. During the test, multiple users should be simulated simultaneously answering questions to check if the system's answering, encoding, priority, latching, digital display, and reset functions are working correctly.