The Patient Counter is a simple and reliable electronic counting module that displays values from 000 to 999 using three bright 7-segment LED displays. Designed around CD4033BE decade counter ICs and a ULN2803A driver, this circuit provides accurate counting with safe current handling.
This counter is suitable for both educational purposes and real-world applications such as patient counters, queue management systems, visitor tracking, and event tallying.
Specifications:
- Circuit type: 3-Digit digital counter
- Display type: 7-segment LED (Common Anode)
- Display range: 000 – 999
- Counter IC: CD4033BE
- Driver IC: ULN2803A
- Input control: Manual push-button count and reset
- Operating Voltage: 3V – 5V logic supply
- Display Voltage: 3V – 5V (higher voltage supported via driver)
- Skill Level: Beginner-friendly
Key Features:
- Displays count values from 000 to 999 using three 7-segment LEDs
- Manual push-button counting for easy operation and learning
- Reset button to instantly clear the count to zero
- ULN2803A driver stage for safe current amplification and display protection
- Designed for Common Anode (CA) 7-segment displays
- Includes current-limiting resistors to protect LED segments
- Ideal for learning digital counters and display interfacing concepts
