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

Rajkumar Sharma
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easy
Tested
SKU: EL115524
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This 4 Digit 7 segment display project contains 4 x Common Cathode displays, current limiting resistors or each LED segment, 4 x PNP transistors on each common cathode for multiplexing, etc. This is a very compact project that works with 5V TTL signals but can be optimized for 3.3V operations by reducing current limiting resistors values. A header connector is provided for easy interface to Arduino or other microcontrollers. All inputs are compatible with TTL 5V signals.

Multiplexed display

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 DISPLAY 4 CATHODE (BC847 BASE)
PIN 14 GND

Features

7-segment CC displays
Multiplexed
5V TTL input
PCB dimensions: 51.28 x 17.78 mm

Arduino test code is provided below.

Similar modules

Schematic

Parts List

NO	QNTY	REF	DESC	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	1	CN1	14 PIN MALE HEADER CONNECTOR PITCH 2.54MM	WURTH	DIGIKEY	732-5334-ND
2	1	C1	DNP
3	4	DS1,DS2,DS3,DS4	7-SEGMENT 0.5 OR 0.56INCH COMMON CATHODE RED OR GREEN DISPLAY	SUN LED	DIGIKEY	754-1705-5-ND or 754-1704-5-ND
4	4	Q1,Q2,Q3,Q4	BC847AL	NEXPERIA	DIGIKEY	1727-2924-2-ND
5	4	R1,R2,R3,R4	1K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
6	8	R5-R14	220E 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY