Project Files of Toggle Switch Library for Proteus: Real SPDT Lever, Click to Flip

TOGGLE SWITCH LIBRARY FOR PROTEUS - V1.0 (a real MTS-102 with a chrome lever you click to flip, 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/toggle-switch-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/toggle-switch-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 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
Toggle-Switch-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
|   |-- TEPRESISTOR.LIB                               306.9 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPTOGGLE.LIB                                  18.2 KB   the library -> 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
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|   |-- TEPTOGGLE.DLL                                 276.5 KB   the model -> MODELS folder
|-- Proteus Simulation/
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPLED5MM.DLL                                 289.5 KB   copy of its model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|   |-- TEPTOGGLE.DLL                                 276.5 KB   copy of the model
|   |-- Toggle-Switch-Two-Way-Lamp-ArduinoUnoV4.pdsprj   22.9 KB   the demo project
|   |-- Two_Way_Lamp_Demo.hex                          13.7 KB   the demo firmware
|-- Arduino Code/
|   |-- Two_Way_Lamp_Demo/Two_Way_Lamp_Demo.ino         1.7 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~12.1 KB   this file
Total: 4.02 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
The MTS-102 toggle switch, drawn at true scale: a black body about 13 x 8 mm, a threaded neck with
its nut, a chrome bat handle and three solder lugs. It is a true analog part:
  * SPDT: the common leg C joins leg 1 or leg 3, through a small contact resistance.
  * Click it at Run and the handle flips. The sheet keeps that position after Stop, and you can pick
    it while stopped.
  * Like the real part, the handle leans AWAY from the leg it joins: handle right joins C to the
    left leg.
  * The contact breaks before it makes, and it bounces for a few ms, so a sketch that does not
    debounce shows the trouble.
  * The small dot on the body opens the pop-up: the contacts, 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.

ONE DEVICE (search "SWITCHTOGGLE" in Pick Devices):
  SWITCHTOGGLETEP   "Toggle Switch V1.0" in TEPTOGGLE.LIB (category Switches and Relays > Switches),
  prefix SW, model TEPTOGGLE.DLL. Pins 1, C and 3.

THE POP-UP
Click the small dot at Run; a click anywhere else on the switch flips it. Tabs:
    Switch     the handle's position, the switch, the contacts with the live path, and eight live
    values. The toolbar: Flip.
    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 with both handles to the right and the lamp off.
  * Four flips in turn, SW1, SW2, SW1, SW2: the lamp went ON, OFF, ON, OFF, 13.7 mA through the
    switches when lit, and the monitor counted all four changes after a 20 ms debounce.
  * A real mouse click on the body flipped the switch, a click on the small dot opened the pop-up
    without flipping it, and the handle stayed where it was after Stop.
  * Each flip made 5 edges as the contact landed, in about 3 ms (3.02 ms and 3.17 ms in the log),
    and broke before it made.
  * The pop-up: Switch, 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" (TEPTOGGLE.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 TEPTOGGLE.DLL, TEPRESISTOR.DLL, TEPLED5MM.DLL and TEPARDUINO.DLL from "Proteus Model Files"
to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPTOGGLE.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "SWITCHTOGGLE".

RUN THE DEMO
"Proteus Simulation\Toggle-Switch-Two-Way-Lamp-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex
file and the DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Two_Way_Lamp_Demo.hex, its serial monitor built in (window "TEP
  Arduino UNO - ARD1").
  SW1:    TOP of the stairs. C on +5V.
  SW2:    BOTTOM of the stairs. C on the LAMP wire.
  Wires:  SW1 leg 3 to SW2 leg 1, and SW1 leg 1 to SW2 leg 3.
  D1:     the lamp, a yellow LED from LAMP through R1 (220 ohm) to GND.
  A0:     watches LAMP through R2 (10k), with R3 (100k) to GND. The sketch only counts: it does not
  control the lamp.
  1. Press Run. The lamp is off.
  2. Click SW1. The lamp comes on.
  3. Click SW2. The lamp goes off.
  4. Click either one. The lamp changes again, and the monitor counts each change.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  +5V - SW1 C ; SW1 3 - SW2 1 ; SW1 1 - SW2 3 ; SW2 C - load - GND : one load worked from two places
  GND - 1 ; +5V - 3 ; C - pin : a pin reads LOW or HIGH with no pull-up
REAL HARDWARE:
 * An MTS-102 is rated about 6 A at 125 V AC and 3 A at 250 V AC, and much less on DC for a load
   with a coil. Read the data sheet of yours.
 * The model warns at 3 A on the Check page. It does not know your voltage.
 * On the mains, the metal handle and the lugs need proper insulation and an earthed case. Leave
   mains wiring to a qualified person.
 * While the handle moves, C is joined to nothing for a moment.

THE DEMO SKETCH ON THE SERIAL MONITOR (Two_Way_Lamp_Demo V1.0, 9600 baud)
There are no commands. The sketch prints a line each time the lamp changes.
EXPECTED MONITOR OUTPUT
  Toggle Switch two-way lamp - The Engineering Projects
  The lamp starts OFF
  Change 1: the lamp is ON

PROPERTIES (double-click the part > Edit Properties)
  Contact resistance, ohm    0.02
  Contact bounce, ms         3
  Position while stopped     Handle right (C to 1) or Handle left (C to 3)
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 TEPTOGGLE.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
* A click opens the pop-up: you clicked the small dot. Click the body or the handle to flip it.
* The sketch sees several changes: that is contact bounce. Debounce it, or set the bounce to 0.
* The handle seems to lean the wrong way: it leans away from the leg it joins, as a real toggle
  does.
* The lamp is on at the start: the two switches agree. Flip either one, or set the Position while
  stopped.
* The part is not simulated: TEPTOGGLE.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/toggle-switch-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 (TEPTOGGLE.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\Two_Way_Lamp_Demo\Two_Way_Lamp_Demo.ino, select Arduino Uno and use Sketch > Export
Compiled Binary. Replace the simulation's .hex with the exported HEX. The sketch needs 4,964 bytes
of flash and 229 bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the contact resistance, break before make, contact bounce, the current rating on the Check
page.
Not modelled: the arc on a heavy load, wear, the voltage rating.

VERSION
TEP Toggle Switch library V1.0 (Nov 2026). Device SWITCHTOGGLETEP (TEPTOGGLE.LIB / TEPTOGGLE.DLL).
Demo sketch Two_Way_Lamp_Demo V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino Library V4.0) with its
built-in serial monitor.