Project Files of 7-Segment Display Library for Proteus: 1 and 4 Digit LED Displays

7-SEGMENT DISPLAY LIBRARY FOR PROTEUS - V1.0 (0.56 inch 1 and 4 digit LED displays with a pop-up)
Designed by The Engineering Projects
www.TheEngineeringProjects.com

IMPORTANT LINKS
Article (read it first - pictures, step by step, every feature explained):
  https://www.theengineeringprojects.com/2026/11/7-segment-display-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/7-segment-display-proteus-library
The demo runs on our Arduino UNO V4.0 (included) - working LEDs, RESET and a
built-in serial monitor, no Virtual Terminal to wire - its own article:
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
The demo's resistors are our own (included):
  https://www.theengineeringprojects.com/2026/11/resistor-library-for-proteus.html
Its lap button is our own push button (included):
  https://www.theengineeringprojects.com/2026/11/push-button-library-for-proteus.html
Support us (the libraries are free):
  https://www.theengineeringprojects.com/donate

FILE STRUCTURE
Seven-Segment-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPBUTTON.LIB                                  20.7 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPRESISTOR.LIB                               306.9 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPSEVENSEG.LIB                                28.8 KB   the library -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPBUTTON.DLL                                 274.0 KB   its model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|   |-- TEPSEVENSEG.DLL                               291.5 KB   the model -> MODELS folder
|-- Proteus Simulation/
|   |-- Seven-Segment-Stopwatch-ArduinoUnoV4.pdsprj    25.4 KB   the demo project
|   |-- Stopwatch_Demo.hex                             11.1 KB   the demo firmware
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPBUTTON.DLL                                 274.0 KB   copy of its model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|   |-- TEPSEVENSEG.DLL                               291.5 KB   copy of the model
|-- Arduino Code/
|   |-- Stopwatch_Demo/Stopwatch_Demo.ino               2.8 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~13.3 KB   this file
Total: 4.03 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
7-segment LED displays, drawn at true scale: a black face with diffused segments.
  * A 0.56 inch single digit, 12.5 x 19 mm, 10 pins (the SC56-11 pinout), and a 0.56 inch four
    digit, 50.4 x 19 mm, 12 pins (the 5641AS pinout),
    built to be multiplexed: the four digits share their segment pins and each has its own common.
  * Common cathode or common anode, red, green, yellow, blue or white - by property.
  * Every segment is an LED junction with its own forward voltage. The segments light with the
    current the eye averages, on a log scale, so a
    multiplexed digit looks as bright as on the bench.
  * The model reads the display back as characters, times the multiplexing (the refresh rate, each
    digit's share) and checks the segment, common
    pin and reverse ratings.
  * Click one at Run for the pop-up: what it reads, every segment line's current, the commons'
    peaks, graphs, an event log and a check page.
The body is drawn as on the real part and to true scale against our Arduino.
The TEP signature and the pop-up are TEP additions.

TWO DEVICES (search "SEVENSEG" in Pick Devices):
  SEVENSEG1TEP   "7-Segment 1 Digit 0.56in V1.0" in TEPSEVENSEG.LIB (Optoelectronics > 7-Segment
  Displays), prefix DS, model TEPSEVENSEG.DLL.
                 Pins: 1 E, 2 D, 3 COM, 4 C, 5 DP, 6 B, 7 A, 8 COM2, 9 F, 10 G (COM and COM2 are
                 joined inside).
  SEVENSEG4TEP   "7-Segment 4 Digit 0.56in V1.0" in TEPSEVENSEG.LIB, prefix DS, model
  TEPSEVENSEG.DLL.
                 Pins: 1 E, 2 D, 3 DP, 4 C, 5 G, 6 D4, 7 B, 8 D3, 9 D2, 10 F, 11 A, 12 D1 (D1 .. D4:
                 the digits' commons).

THE POP-UP
Click the part at Run. Tabs:
    Display    the state (READS with the refresh, OFF, OVER CURRENT, REVERSE), the display drawn
    large with its lit segments, a bar for every
               segment line (average) and every common (peak), and eight live values.
    Graphs     the live values over the last 2, 6 or 15 s. Live / Freeze.
    Event log  every change and warning; filters All / Changes / Warnings, Pause, Clear
    Check      what the part is doing and what to look at, each with a verdict (green = fine, amber
    = check, red = wrong)
    Settings   theme, text size, open at Run, window size
    Help       report a bug, suggest a feature, article, updates, donate, forum; Copy diagnostics
    for a bug report

TEST STATUS
V1.0: verified in Proteus 8.5 on 31 Oct 2026 (the demo project as shipped: an A4 sheet, an Arduino UNO V4.0).
What the runs showed (the model's own numbers and the sketch's monitor):
  * The project loads and starts cleanly. The UNO multiplexes five digits on one segment bus, 2 ms
    each: DS1's four and DS2's one. Both pop-ups
    measured a 99 Hz refresh, each digit on for about 20 % of the time.
  * DS1 read "02.56" at 2.65 s of the run, "04.03" at 4.12 s and "06.12" at 6.21 s - the stopwatch,
    read back from the segments. Its log names a
    reading every 0.7 s.
  * Two taps on SW1 counted two laps (the monitor: Lap 1 at 2.76 s, Lap 2 at 3.42 s); DS2 read "2".
  * Through the 1k resistors: 3.2 mA peak and about 0.6 mA average in a segment, 20 mA at the most
    through a common pin (under the UNO's 40 mA),
    5.0 V across a segment that is off (its rating). The Check page marks the brightness amber:
    readable but dim.
  * The pop-up: Display, Graphs, Event log, Check - all four pages followed the run, for both
    displays.

INSTALLATION (about 2 minutes)
1. Close Proteus. Extract the WHOLE ZIP to a normal folder (e.g. Desktop).
2. Copy everything in "Proteus Library Files" (TEPSEVENSEG.LIB, TEPRESISTOR.LIB, TEPBUTTON.LIB and
our Arduino library V4.0, ArduinoV4TEP.LIB, with the ARDUINO UNO V4.0 used by the demo) to the
LIBRARY folder of Proteus, for example:
     C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\LIBRARY
   (use the folder that already holds Proteus's own .LIB files).
3. Copy TEPSEVENSEG.DLL, TEPRESISTOR.DLL, TEPBUTTON.DLL and TEPARDUINO.DLL from "Proteus Model
Files" to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPSEVENSEG.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "SEVENSEG".

RUN THE DEMO
"Proteus Simulation\Seven-Segment-Stopwatch-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file
and the DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Stopwatch_Demo.hex, its serial monitor built in (window "TEP
  Arduino UNO - ARD1").
  R1-R8:  1k resistors (ours) from D2 .. D9 to the segment bus SA .. SG, SDP, shared by both
  displays.
  DS1:    the 4-digit display, commons D1 .. D4 on A0 .. A3: a stopwatch, seconds and hundredths.
  DS2:    the 1-digit display, its common on A4: the lap count.
  SW1:    our push button from D10 to GND: a lap.
  1. Press Run. The stopwatch starts at once; both pop-ups show the 99 Hz refresh.
  2. Click SW1, or open its pop-up and click Press: a lap - DS2 counts it, the monitor prints the
  time.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  pin - resistor - segment pin (one resistor per segment line)  : common cathode, the digit's common
  to a pin set LOW to light it
  more current : a transistor on each common; the UNO pin then only drives its base
REAL HARDWARE:
 * Common cathode: a segment lights when its pin is HIGH and its common is LOW. Common anode: the
   reverse.
 * Put the resistors on the segment lines, never on the common: a shared resistor dims a digit as
   more segments light.
 * Multiplex fast: every digit over 60 times a second, or the display flickers.
 * A common pin carries up to eight segments: keep it under the pin's limit, or use a transistor.
 * Update all the digits at the start of a frame, so the display never shows half an old and half a
   new value.

THE DEMO SKETCH ON THE SERIAL MONITOR (Stopwatch_Demo V1.0, 9600 baud)
There are no commands. The stopwatch runs from the start; SW1 counts a lap and the sketch prints its
time.
EXPECTED MONITOR OUTPUT
  Stopwatch - The Engineering Projects
  Press SW1 to count a lap
  Lap 1 at 2.76 s

PROPERTIES (double-click the part > Edit Properties)
  Common (CATHODE or ANODE)        CATHODE
  Colour                           RED, GREEN, YELLOW, BLUE or WHITE (Vf 2.0, 2.2, 2.1, 3.2, 3.1 V
  at 20 mA)
Every run starts again from the properties.

LINKS.INI (OPTIONAL)
The Help page cards of the pop-up open web pages. To point them somewhere else without a new DLL,
put a text file named links.ini next to TEPSEVENSEG.DLL with lines KEY=URL, for example:
  ARTICLE=https://www.theengineeringprojects.com/...
Keys: WEBSITE, FORUM, BUG_REPORT, FEATURE_REQUEST, ARTICLE, USER_GUIDE,
UPDATE_CHECK, DONATE. Only http:// and https:// links are used; lines starting
with # are comments.

TROUBLESHOOTING
* Nothing lights: the common is wrong (cathode for anode), or the commons are never driven LOW
  (common cathode).
* Wrong segments light: the segment order on the pins; check the pin table above.
* The digits flicker: the refresh is under 60 Hz - shorter slots, or less work in the loop.
* The Check page warns about a common pin: eight lit segments through one pin; use larger resistors
  or a transistor.
* The part is not simulated: TEPSEVENSEG.DLL is missing from MODELS and from the project folder. No
  UNO / no monitor window: TEPARDUINO.DLL is missing, or click the UNO's USB port.

BUG REPORTS AND FEATURE REQUESTS
Please post them in our forum with a screenshot, the Serial Monitor text, the
simulation log and the pop-up's Copy diagnostics text:
  https://www.theengineeringprojects.com/forum/category/7-segment-display-proteus-library

SUPPORT US
This library is free. If it saves you time, please support our work:
  https://www.theengineeringprojects.com/donate

WEBSITE
  https://www.theengineeringprojects.com/

LICENCES AND THIRD-PARTY NOTES
* The model (TEPSEVENSEG.DLL), the symbols and artwork, the other parts of ours in the demo and the
  Arduino Library V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, with its built-in TEP Serial Monitor
  Advance) are made by The Engineering Projects. The models use only standard Windows libraries; no
  Visual C++ redistributable is needed.
  The C++ source code is not included.
* Arduino UNO V4.0 (ArduinoV4TEP.LIB / TEPARDUINO.DLL, our Arduino Library V4.0 - its
  microcontroller is Proteus's own AVR model): The Engineering Projects,
  https://www.theengineeringprojects.com/2026/10/arduino-uno-library-for-proteus-v40.html
* The .hex file is built from the demo sketch and the Arduino AVR core 1.8.6, which includes
  LGPL-licensed code; its source code is available at
  https://github.com/arduino/ArduinoCore-avr/tree/1.8.6
* Proteus is a product of Labcenter Electronics and is not included. Arduino is a trademark of Arduino SA.
  This library is not made or endorsed by Arduino or Labcenter.

REBUILDING THE FIRMWARE (OPTIONAL)
The HEX file is supplied; Arduino IDE is not needed to run the demo. To edit the sketch, open
Arduino Code\Stopwatch_Demo\Stopwatch_Demo.ino, select Arduino Uno and use Sketch > Export Compiled
Binary. Replace the simulation's .hex with the exported HEX. The sketch needs 4,036 bytes of flash
and 238 bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: every segment's LED junction, the eye's average and its log response, the reading of the
digits, the refresh and each digit's share,
the segment, common pin and reverse ratings.
Not modelled: the light's colour shift with current, the junction's heating, the segments' leakage
glow.

VERSION
TEP 7-Segment Display library V1.0 (Nov 2026). Devices SEVENSEG1TEP and SEVENSEG4TEP
(TEPSEVENSEG.LIB / TEPSEVENSEG.DLL). Demo sketch Stopwatch_Demo V1.0. Demo board: ARDUINO UNO V4.0
(TEP Arduino Library V4.0) with its built-in serial monitor.