Arduino 3-Digit 0.5″ Common Cathode 7 Segment Display Module

Rajkumar Sharma
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SKU: EL115820
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This project will help you to easily develop an Arduino compatible project that requires 3 x 7-Segment 0.5″ displays. These are common cathode displays that use multiplexed configuration, BC847 transistor drives 3 x common cathodes, all display segments are connected to the microcontroller using current limiting resistors. The circuit operates with 5V DC, Connector CN1 is provided for bootloader and Arduino firmware upload. Upload Arduino code to test the board. The user will be able to create a 5.00V Voltage Meter. Use analog pin A0 for voltage input, Connector U2.

Arduino Programming

A new Atmega328 chip requires a bootloader and Arduino firmware upload. Connector CN1 is provided for both operations, follow the link below to learn more about programming the board using Arduino.

https://www.arduino.cc/en/Tutorial/BuiltInExamples/ArduinoToBreadboard

Arduino Compatible Hardware

Atmega328 microcontroller
3 x Digit 0.5 Inch 7 Segment Display, Common Cathode
3 x BC847 Transistors to drive Display Common Cathode for Multiplexing
CN1: Arduino Programming and Boot-Loader
U2: 3 Pin Connector to Connect LM35 Temperature Sensor or Analog Input
Current Limiting Resistors for 7 segment display and other components

Applications

3 Digit Counter
3 Digit Timer
3 Digit Thermometer
Voltmeter
Current Meter
Sensor Value Display
3 Digit Score Board
Dice

Features

Supply 5V DC can be optimized for 3.3V Operations
LM35 Temperature Sensor or Analog Input A0
Compact Hardware
PCB Dimensions 38.42 x 35.40 mm

Arduino Pins

Digital Pin D10 Display 1 Common Cathode
Digital Pin D11 Display 2 Common Cathode
Digital Pin D12 Display 3 Common 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
Digital Inputs D13, D12, D11, TX, RX (Available for Inputs after programming)
Analog A0 for Analog Signal Input from Sensor or Analog Source
Programming and Boot-loader Pin D13, D12, D11, TX, RX, RESET

Similar modules

Schematic

Parts List

NO	QNTY.	REF	DESC	MANUFACTURER	SUPPLIER	PART NO
1	1	CN1	8 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5321-ND
2	1	C1	10uF/10V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
3	2	C2,C3	0.1uF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
4	2	R3,C4	DNP	MURATA/YAGEO	DIGIKEY
5	2	C5,C6	22PF/50V SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
6	3	DS1,DS2,DS3	0.5/0.56 INCH 7 SEGMENT COMMON CATHODE DISPLAY	SUN LED	DIGIKEY	754-1705-5-ND or 754-1704-5-ND
7	3	Q1,Q2,Q3	BC847AL	NEXPERIA	DIGIKEY	1727-2924-2-ND
8	1	R1	10K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
9	1	R2	10E 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
10	3	R4,R5,R6	1K 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
11	8	R7-R14	220E 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
12	1	R15	1M 5% SMD SIZE 0805	MURATA/YAGEO	DIGIKEY
13	1	U1	ATMEGA328TQPF-32	MICROCHIP	DIGIKEY	ATMEGA328PB-AURCT-ND
14	1	U2	3 PIN MALE OR FEMALE HEADER			OPTIONAL
15	1	X1	16Mhz	ECS INC	DIGIKEY	X1103-ND