3 Digit Common Cathode 0.5″ – 7 Segment Display Module (Multiplexed)

  • Rajkumar Sharma
  • 12 Views
  • easy
  • Tested

This is a 3 Digit 7-segment display project that contains 3 x Common Cathode displays, current limiting resistors or each LED segment, 3 x PNP Transistor on each common cathode for multiplexing etc. The project works with 5V TTL signals but can be optimized for 3.3V operations by reducing the current limiting resistors’ value. A header connector is provided for easy interface to Arduino or other microcontrollers. All inputs are TTL 5V compatible.

Multiplexed Display Info

https://en.wikipedia.org/wiki/Multiplexed_display

  • PIN 1 NC (VCC-NO USE)
  • PIN 2 SEGMENT A
  • PIN 3 SEGMENT B
  • PIN 4 SEGMENT C
  • PIN 5 SEMENT D
  • PIN 6 SEGMENT E
  • PIN 7 SEGMENT F
  • PIN 8 SEGMENT G
  • PIN 9 DP
  • PIN 10 DISPLAY 1 CATHODE (BC847 BASE)
  • PIN 11 DISPLAY 2 CATHODE (BC847 BASE)
  • PIN 12 DISPLAY 3 CATHODE (BC847 BASE)
  • PIN 13 GND
  • PIN 14 NC

Arduino Code

Arduino code is provided to test the board. The user will be able to create a 0 to 5V DC Voltmeter using this code. Upload the code to Arduino Uno, apply 0 to 5V to Analog Pin A0 to Measure the voltage. Refer Arduino pin configuration vs display bellow:

  • Digital Pin D12 = Display 1 Cathode
  • Digital Pin D11 = Display 2 Cathode
  • Digital Pin D10 = Display 3 Cathode
  • Digital Pin D2 = Display Segment A
  • Digital Pin D3 = Display Segment B
  • Digital Pin D4 = Display Segment C
  • Digital Pin D5 = Display Segment D
  • Digital Pin D6 = Display Segment E
  • Digital Pin D7 = Display Segment F
  • Digital Pin D8 = Display Segment G
  • Digital Pin D9 = Display Segment DP
  • Analog Pin Input = A0 5V Meter

Similar modules

Schematic

Parts List

NOQNTY.REF.DESC.MANUFACTURERSUPPLIERPART NO
11CN114 PIN MALE HEADER WURTH732-5334-ND
21C1DNP
33DS1,DS2,DS3COMMON CATHODE 0.5/0.56 INCH KINGBRIGHT754-1705-5-ND
43Q1,Q2,Q3BC847ALNEXPERIA1727-2924-2-ND
53R1,R2,R31K 5% SMD SIZE 0805MURATA/YAGEO
68R4,R5,R6,R7,R8,R9,R10,R11220E 5% SMD SIZE 0805MURATA/YAGEO

Connections



Gerber View

Photos

Video

SC56-21SRWA Datasheet

SC56-21SRWA

PCB

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