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

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

• 4 Digit Common Cathode 0.5″ – 7 Segment Display Module (Multiplexed)
• 2 Digit Common Cathode 0.5″ – 7 Segment Display Module (Multiplexed)

Schematic

Parts List

Connections

Gerber View

Photos

Video

SC56-21SRWA Datasheet

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