Project Files of Micro Limit Switch Library for Proteus: Real KW11 Roller Lever

MICRO LIMIT SWITCH LIBRARY FOR PROTEUS - V1.0 (a real KW11 roller lever switch, NO and NC, 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/micro-limit-switch-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/micro-limit-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 resistor 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
Micro-Limit-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
|   |-- TEPLIMIT.LIB                                   35.7 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
|   |-- TEPLIMIT.DLL                                  277.0 KB   the model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   its model -> MODELS folder
|-- Proteus Simulation/
|   |-- Box_Counter_Demo.hex                            9.8 KB   the demo firmware
|   |-- Micro-Limit-Switch-Box-Counter-ArduinoUnoV4.pdsprj   23.8 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPLED5MM.DLL                                 289.5 KB   copy of its model
|   |-- TEPLIMIT.DLL                                  277.0 KB   copy of the model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of its model
|-- Arduino Code/
|   |-- Box_Counter_Demo/Box_Counter_Demo.ino           2.4 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~11.8 KB   this file
Total: 4.04 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
The KW11-3Z micro switch, drawn at true scale from the side: a black body 20 x 10 mm with two
mounting holes, a steel lever with a roller, and three tabs C, NC and NO. It is a true analog part:
  * SPDT and momentary: C joins NC at rest, and NO while the lever is held down. Let go and it
    springs back.
  * Hold the mouse on it at Run and the lever goes down; let go and it comes up. The Press chip
    gives a short tap.
  * 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 "SWITCHLIMIT" in Pick Devices):
  SWITCHLIMITTEP   "Micro Limit Switch V1.0" in TEPLIMIT.LIB (category Switches and Relays >
  Switches), prefix SW, model TEPLIMIT.DLL. Pins C, NC and NO.

THE POP-UP
Click the small dot at Run; hold the mouse anywhere else on the switch to press it. Tabs:
    Switch     RELEASED or PRESSED, the switch, the contacts with the live path, and eight live
    values. The toolbar: Press (a 0.2 s tap) and Hold down / Release.
    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 sketch reads NO HIGH and NC LOW, and reports the
    switch good and released.
  * Three short presses of 0.2 s and one long hold: the monitor counted Box 1 to Box 4, and LED D1
    lit at 12.6 mA while the lever was down.
  * Each change settled in 2.04 to 2.50 ms with 3 or 4 edges, broke before it made, and the lever
    showed pressed on the sheet while held and sprang back when let go.
  * The contact carried 50 uA, the current of the UNO's pull-up.
  * 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" (TEPLIMIT.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 TEPLIMIT.DLL, TEPRESISTOR.DLL, TEPLED5MM.DLL and TEPARDUINO.DLL from "Proteus Model Files"
to the MODELS folder (...\Proteus 8 Professional\MODELS).
4. Delete TEPLIMIT.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "SWITCHLIMIT".

RUN THE DEMO
"Proteus Simulation\Micro-Limit-Switch-Box-Counter-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the
.hex file and the DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Box_Counter_Demo.hex, its serial monitor built in (window "TEP
  Arduino UNO - ARD1").
  SW1:    C to GND, NO to D2, NC to D3 (the UNO's own pull-ups). Exactly one of D2 and D3 is LOW
  while the switch is good.
  D1:     a yellow LED on D8 through R1: lit while a box is on the lever.
  1. Press Run. The monitor says the switch is good and released.
  2. Hold the mouse on SW1, or use Press. Each press counts one box, and D1 lights while it is held.
  3. The sketch would print FAULT if neither or both contacts read closed for more than 200 ms.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  C - GND ; NO - pin (pull-up) : LOW while pressed
  C - GND ; NC - pin (pull-up) : LOW while released - a broken wire then reads as pressed
  both : one LOW and one HIGH means the switch and its wires are good
REAL HARDWARE:
 * A KW11-3Z is rated about 5 A at 250 V AC. Small ones for boards carry far less.
 * The model warns at 5 A on the Check page. It does not know your voltage.
 * The roller makes it easy for a moving part to push the lever from the side, as on a conveyor or a
   door.
 * Mount it with two M2.5 or M3 screws through the holes, so it cannot shift.

THE DEMO SKETCH ON THE SERIAL MONITOR (Box_Counter_Demo V1.0, 9600 baud)
There are no commands. The sketch prints a line for each box and for a fault.
EXPECTED MONITOR OUTPUT
  Micro Limit Switch box counter - The Engineering Projects
  The switch is good and released
  Box 1

PROPERTIES (double-click the part > Edit Properties)
  Contact resistance, ohm    0.03
  Contact bounce, ms         2
  Look while stopped         Released or Pressed (at Run it always starts released)
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 TEPLIMIT.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. Hold the mouse on the lever or the body to
  press it.
* One press counts twice: that is contact bounce. Debounce it, or set the bounce to 0.
* The sketch prints FAULT: one of the wires to NO or NC is missing, or they are joined together.
* The part is not simulated: TEPLIMIT.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/micro-limit-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 (TEPLIMIT.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\Box_Counter_Demo\Box_Counter_Demo.ino, select Arduino Uno and use Sketch > Export
Compiled Binary. Replace the simulation's .hex with the exported HEX. The sketch needs 3,574 bytes
of flash and 210 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 force and travel of the lever, wear, the voltage rating.

VERSION
TEP Micro Limit Switch library V1.0 (Nov 2026). Device SWITCHLIMITTEP (TEPLIMIT.LIB / TEPLIMIT.DLL).
Demo sketch Box_Counter_Demo V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino Library V4.0) with its
built-in serial monitor.