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

Rajkumar Sharma
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SKU: EL116299
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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

NO	QNTY.	REF.	DESC.	MANUFACTURER	PART NO
1	1	CN1	14 PIN MALE HEADER	WURTH	732-5334-ND
2	1	C1	DNP
3	3	DS1,DS2,DS3	COMMON CATHODE 0.5/0.56 INCH	KINGBRIGHT	754-1705-5-ND
4	3	Q1,Q2,Q3	BC847AL	NEXPERIA	1727-2924-2-ND
5	3	R1,R2,R3	1K 5% SMD SIZE 0805	MURATA/YAGEO
6	8	R4,R5,R6,R7,R8,R9,R10,R11	220E 5% SMD SIZE 0805	MURATA/YAGEO