UP-DOWN-Counter-with-single-7-segment-display

This a simple project Up/Down binary counter circuit using the CD4029BE (Binary/Decade Counter) and a 74LS47 BCD-to-7-Segment Decoder/Driver to display count values on a 7-segment common anode display. The circuit also includes LED indicators for binary output and control logic for manual counting, reset, and direction (Up/Down) selection.

Features

• Up/Down counting mode using a toggle switch
• Manual clock input via push button
• Reset control for restarting count sequence
• Binary LED indicators for visualizing Q outputs
• BCD to 7-segment display via 74LS47 decoder
• Suitable for educational and hobby projects

How It Works

1. Clock Pulse(SW1) - Generate HIGH input to the clock pin of CD4029BE and led indicator (D6)
2. Reset (SW2) - Clears counter to 0000
3. Up/Down Switch(SW3) - Select counting mode (UP/DOWN) with led indicator (D5)
   • Led ON = UP
   • Led OFF = DOWN
4. Output Display
   • LEDs show binary output (Q0–Q3)
   • 7-segment display shows decimal equivalent (0–9)

Notes & Tips

• Use SPST switches instead of DPDT for smaller PCB.
• For clean input, consider using debouncing on push buttons.
• Modify the counter mode (binary/decade) by changing pin 9 on CD4029.
• For continuous counting, replace the push button with a clock generator (555 timer or square wave source).