Project Files of Flashing LED Library for Proteus: LEDs That Blink by Themselves

FLASHING LED LIBRARY FOR PROTEUS - V1.0 (a real 5 mm LED with its own chip inside, 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/flashing-led-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/flashing-led-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 and plain LED are our own parts too (included):
  https://www.theengineeringprojects.com/2026/11/5mm-led-library-for-proteus.html
Support us (the libraries are free):
  https://www.theengineeringprojects.com/donate

FILE STRUCTURE
Flashing-LED-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPLED5MM.LIB                                  21.8 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPLEDFLASH.LIB                                15.0 KB   the library -> LIBRARY folder
|   |-- TEPRESISTOR.LIB                               306.9 KB   a part the demo uses -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPLED5MM.DLL                                 289.5 KB   its model -> MODELS folder
|   |-- TEPLEDFLASH.DLL                               290.5 KB   the model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|-- Proteus Simulation/
|   |-- Flash_Counter_Demo.hex                         13.9 KB   the demo firmware
|   |-- Flashing-LED-ArduinoUnoV4.pdsprj               22.6 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPLED5MM.DLL                                 289.5 KB   copy of its model
|   |-- TEPLEDFLASH.DLL                               290.5 KB   copy of the model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|-- Arduino Code/
|   |-- Flash_Counter_Demo/Flash_Counter_Demo.ino       1.7 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~11.2 KB   this file
Total: 4.05 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
The self-flashing LED, drawn at true scale: a 5 mm dome with a tiny oscillator chip inside. Give it
a steady supply, and it flashes by itself. It is a true analog part:
  * The diode law with a series resistance, plus a chip that switches the current on and off.
  * The flash rate is a property, 2 Hz by default, and each LED keeps its own time.
  * The glow follows the current, and too much current burns it out, like any LED.
  * Click it at Run for its pop-up: the series resistor, the live values, 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.

THREE DEVICES (search "LEDFLASH" in Pick Devices):
  LEDFLASHREDTEP     "Flashing LED Red V1.0"
  LEDFLASHGREENTEP   "Flashing LED Green V1.0"
  LEDFLASHBLUETEP    "Flashing LED Blue V1.0"
All in TEPLEDFLASH.LIB (category Optoelectronics > LEDs), prefix D, model TEPLEDFLASH.DLL. Pins A
and K.

THE POP-UP
Click the part at Run. It stays closed until then (you can turn "Open the panel at Run" on in its
Settings page). Tabs:
    LED        the state, the LED, what a series resistor should be, and eight live values. The
    toolbar: New part.
    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. D1, D2 and D3 flashed by themselves at 2, 2.2 and 3 Hz on
    a steady supply, and drifted in and out of step.
  * The sketch timed D1 through the 22 ohm sense resistor: 2.00 Hz, on for 250 ms. D1 drew 24 mA
    while on, and its copy on D8 followed it.
  * The pop-up: LED, Graphs, Event log, Check - all four pages followed the run.

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" (TEPLEDFLASH.LIB, TEPRESISTOR.LIB, TEPLED5MM.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 TEPLEDFLASH.DLL, TEPRESISTOR.DLL, TEPLED5MM.DLL and TEPARDUINO.DLL from "Proteus Model
Files" to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPLEDFLASH.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "LEDFLASH".

RUN THE DEMO
"Proteus Simulation\Flashing-LED-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file and the
DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Flash_Counter_Demo.hex, its serial monitor built in (window "TEP
  Arduino UNO - ARD1").
  D1, D2, D3: red at 2 Hz, green at 2.2 Hz and blue at 3 Hz, each from +5V through 100 ohm. They
  need no code.
  R4:     22 ohm from D1's cathode to GND. It gives A0 a small voltage while D1 is on.
  D4, R5: a plain red LED on D8, which copies what the sketch saw.
  1. Press Run. The three LEDs flash by themselves, and they drift in and out of step.
  2. The monitor prints D1's flash rate and on time.
  3. Click an LED for its pop-up.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  +5V - resistor - A ; K - GND
A steady supply is all it needs. The chip inside does the flashing.
REAL HARDWARE:
 * Check the data sheet: some flashers have a resistor inside, and some do not.
 * Most run from about 3 V to 5 V.
 * Do not use one as a clock: the rate varies from part to part, and with the voltage.

THE DEMO SKETCH ON THE SERIAL MONITOR (Flash_Counter_Demo V1.0, 9600 baud)
There are no commands. The sketch prints a line for each flash of D1.
EXPECTED MONITOR OUTPUT
  Flashing LED demo - The Engineering Projects
  The LEDs flash by themselves. The sketch only watches D1.

PROPERTIES (double-click the part > Edit Properties)
  Forward voltage at 20 mA, V    2.0 for red
  Maximum current, mA            30
  Flash rate, Hz                 2
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 TEPLEDFLASH.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
* It does not flash: the voltage across it is under about 2.5 V.
* BURNT OUT: too much current. Add more ohms, then New part.
* The pop-up does not open: click the part at Run (it stays closed until then).
* The part is not simulated: TEPLEDFLASH.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/flashing-led-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 (TEPLEDFLASH.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\Flash_Counter_Demo\Flash_Counter_Demo.ino, select Arduino Uno and use Sketch > Export
Compiled Binary. Replace the simulation's .hex with the exported HEX. The sketch needs 5,036 bytes
of flash and 226 bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the diode law, the oscillator, a small idle current, the glow, heating and burning out.
Not modelled: the change of the rate with voltage and temperature.

VERSION
TEP Flashing LED library V1.0 (Nov 2026). Devices LEDFLASHREDTEP, LEDFLASHGREENTEP, LEDFLASHBLUETEP
(TEPLEDFLASH.LIB / TEPLEDFLASH.DLL). Demo sketch Flash_Counter_Demo V1.0. Demo board: ARDUINO UNO
V4.0 (TEP Arduino Library V4.0) with its built-in serial monitor.