7-Segment 4-Digit multiplexing with 4511

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This is a tutorial on multiplexing four seven-segment (Common Cathode LED displays from an Arduino using a single 4511 IC and a handful of transistors.

Wiring Instructions

To wire your 7-Segment 4-Digit Display (Common Cathode) to your 4511 and Arduino, connect the following pins:

  • 7-Segment Pin1 –> 4511 Pin 9 via Resistor 390ohm
  • 7-Segment Pin2 –> 4511 Pin 10 via Resistor 390ohm
  • 7-Segment Pin3 –>
  • 7-Segment Pin4 –> 4511 Pin 11 via Resistor 390ohm
  • 7-Segment Pin5 –> 4511 Pin 14 via Resistor 390ohm
  • 7-Segment Pin6 –> Transistor 4 NPN Pin 3 (Emitter)
  • 7-Segment Pin7 –> 4511 Pin 12 via Resistor 390ohm
  • 7-Segment Pin8 –> Transistor 3 NPN Pin 3 (Emitter)
  • 7-Segment Pin9 –> Transistor 2 NPN Pin 3 (Emitter)
  • 7-Segment Pin10 –> 4511 Pin 15 via Resistor 390ohm
  • 7-Segment Pin11 –> 4511 Pin 13 via Resistor 390ohm
  • 7-Segment Pin12 –> Transistor 1 NPN Pin 3 (Emitter)
  • 4511 Pin 1 –> Arduino Pin 8
  • 4511 Pin 2 –> Arduino Pin 7
  • 4511 Pin 3 –> +5V
  • 4511 Pin 4 –> +5v via Resistor 150Kohm
  • 4511 Pin 5 –> GND
  • 4511 Pin 6 –> Arduino Pin 6
  • 4511 Pin 7 –> Arduino Pin 5
  • 4511 Pin 8 –> GND
  • 4511 Pins 9-15 to 7 Segments
  • 4511 Pin 16 –> +5V
  • Transistor 1 Pin 2 –> Arduino Pin 1 via Resistor 1Kohm
  • Transistor 2 Pin 2 –> Arduino Pin 2 via Resistor 1Kohm
  • Transistor 3 Pin 2 –> Arduino Pin 3 via Resistor 1Kohm
  • Transistor 4 Pin 2 –> Arduino Pin 4 via Resistor 1Kohm
  • Don’t forget to connect Pins 1 of the transistors to GND

Recommended Software

  • none

Instructions and Code

Posted in Arduino Tutorials Tagged with: , ,
One comment on “7-Segment 4-Digit multiplexing with 4511
  1. Peter says:

    There are PNP transistors shown on the schematic, not NPN and 3 7seg. LED display, not 4.

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