Project Files of Resistor Library for Proteus: Real Colour Code Bands and Burn-Out

RESISTOR LIBRARY FOR PROTEUS - V1.0 (real-looking resistors with a true colour code and 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/resistor-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/resistor-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
Support us (the libraries are free):
  https://www.theengineeringprojects.com/donate

FILE STRUCTURE
Resistor-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPRESISTOR.LIB                               306.9 KB   the library -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPRESISTOR.DLL                               311.0 KB   the model -> MODELS folder
|-- Proteus Simulation/
|   |-- Resistor_Demo.hex                              20.5 KB   the demo firmware
|   |-- Resistor-Ohmmeter-ArduinoUnoV4.pdsprj          24.4 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPRESISTOR.DLL                               311.0 KB   copy of the model
|-- Arduino Code/
|   |-- Resistor_Demo/Resistor_Demo.ino                 3.5 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~16.5 KB   this file
Total: 2.89 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
Proteus already has a resistor, drawn as a plain box. This library draws the
part you actually hold in your hand: a small axial resistor with a real body,
tinned leads and colour bands that tell the truth about its value. It is a
true analog part in the simulation, and it behaves like a real one too:
  * The bands follow the value. Type 1k, 4k7, 2.2M, 0R47, R47, 1000 or 1Meg in
    the Resistance box and the bands are worked out by the colour code, with
    the digits, the multiplier and the tolerance band, including gold and
    silver multipliers for values under 10 ohm and one black band for 0 ohm.
  * It heats up. The power it burns warms the body: a part at its full rating
    settles 130 C above the room, in a time that grows with its size. The body
    takes on colour as it gets hot.
  * It burns out. Past 350 C the body chars and the part opens (100 Mohm), the
    circuit loses its current and the Event log says why. Fit a new part from
    the pop-up, or press Stop and Run.
  * Click it at Run for its pop-up: the bands decoded one by one, the volts,
    amps and watts, the body temperature, the safe voltage and current for this
    value and rating, the graphs, the event log and a check page.
  * The pop-up's chips change the part while the simulation runs: step the
    value up and down the E12 series, change the tolerance, change the power
    rating, and watch the circuit react.
The body, the leads and the bands are drawn as on the real parts; the TEP signature and the pop-up are
TEP additions, and a real resistor has neither of them.

TWO DEVICES (search "RESISTOR" and look for the TEP names in Pick Devices):
  RESISTOR4BANDTEP   "Resistor 4-Band V1.0"   a beige carbon film part, four
                     bands, 5 % by default
  RESISTOR5BANDTEP   "Resistor 5-Band V1.0"   a blue metal film part, five
                     bands (three digits), 1 % by default
  Both are in TEPRESISTOR.LIB (category Resistors > Generic), prefix R, model
  TEPRESISTOR.DLL. Small TEP signature on the body.

THE BANDS: AT RUN, AND WHILE STOPPED
Proteus runs a part's model only at Run, so here is how the bands behave:
  * At Run they always follow what you typed, whatever the value.
  * While stopped the part shows the colour set by the property "Colour bands
    while stopped". It is a dropdown in Edit Properties with 76 values: every
    E12 value from 1 ohm to 820k, then 1M, 2.2M, 4.7M and 10M. Pick one and the
    bands change at once on the sheet, with no Run.
  * After a Run the dropdown is set for you to the value nearest what you typed,
    and it stays there after Stop and after you save the project.
So: type 4k7, press Run once (or pick 4.7k in the dropdown) and the sheet is
right from then on. Tolerance while stopped: gold (5 %) on the 4-band part and
brown (1 %) on the 5-band part; at Run the band follows TOLERANCE.
The pop-up's chips change this run only: at Stop the part goes back to what you
typed, like taking a test part out of the circuit.

THE POP-UP
Click the part at Run. It opens closed by default, because a sheet can hold many
resistors (you can turn "Open the panel at Run" on in its Settings page). Tabs:
    Resistor   the state in big letters (CONDUCTING, NO CURRENT, HOT, OVERLOAD,
               BURNT OUT), the big resistor with each band decoded, the range a
               good part falls in, and eight live values: voltage, current,
               power against the rating, body temperature, safe voltage, safe
               current, heat so far and thermal noise in 20 kHz. The toolbar:
               E12 down, E12 up, tolerance, power rating, New part.
    Graphs     voltage, current, power and temperature over the last 2, 6 or
               15 s, with the rating and the 155 C limit as red lines. Live /
               Freeze.
    Event log  every change, overload and burn-out; filters All / Changes /
               Warnings, Pause, Clear
    Check      Is this a shop value? Do the bands read it exactly? How hard is
               the part working? How hot is it? 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 with its built-in monitor, R1 to R4).
What the runs showed (the model's own numbers and the sketch's monitor):
  * The project loads and starts cleanly. Stopped, each part shows its own bands. At Run R1 and R2 carry 340 uA, with
    3.40 V and 1.60 V across them, and the monitor reads "R2 = 4.70 kohm, nearest E12 = 4.70 kohm, bands Yellow Violet
    Red". R3 at 100 ohm: 48.9 mA, 0.239 W; the body climbs towards 150 C, because it runs close to its rating.
  * E12 up on R2: 5.6k, the bands turn Green Blue Red on the sheet, and the monitor reads "R2 = 5.62 kohm, nearest E12 =
    5.60 kohm, bands Green Blue Red" (the UNO's reading moves in steps).
  * E12 down on R3: 82 ohm 59.4 mA 0.289 W (OVERLOAD, the L LED on), 68 ohm 71.2 mA 0.345 W, 56 ohm 85.9 mA 0.413 W,
    47 ohm 101.6 mA 0.485 W, 39 ohm 121.4 mA 0.574 W, 33 ohm 142.0 mA 0.666 W. At 33 ohm the body reached 350 C within
    8 s: "BURNT OUT", the part opened, 5.00 V across it and no current. The monitor printed "R3 BURNT OUT: no current
    on A1 - the resistor is open".
  * New part, then E12 up back to 100 ohm: 48.9 mA and 0.239 W again.
  * A real mouse click on a resistor at Run opens its pop-up, closed until then. Picking 6.8k in Colour bands while
    stopped changed R2's bands at once on the stopped sheet; after a Run the dropdown read 4.7k and the look stayed
    through Stop, Save and a fresh load.
  * The pop-up: Resistor (4-band and 5-band), Graphs, Event log, Check - all four pages followed the run.
  Plus automatic checks on a PC, 0 failed: the value text (1k, 4k7, 0R47, R47,
  2M2, 1Meg, 4.7k ohm and more, with bad text refused), the colour code of 11
  values on both band counts, the nearest E12 and E24 value, stepping up and
  down the series across a decade, the dropdown's numbering; the demo project
  read back from disk (35 checks).

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" (TEPRESISTOR.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
   (on some PCs: C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\
   LIBRARY - use the folder that already holds Proteus's own .LIB files).
3. Copy TEPRESISTOR.DLL and TEPARDUINO.DLL from "Proteus Model Files" to the
   MODELS folder (...\Proteus 8 Professional\MODELS).
   ArduinoV4TEP.LIB and TEPARDUINO.DLL are the files of our Arduino Library
   V4.0 - if you have it, they are the same.
4. Delete TEPRESISTOR.IDX from the LIBRARY folder if it is there (Proteus makes
   a new index).
5. Start Proteus. In Pick Devices (P) search "RESISTOR4BAND" or "RESISTOR5BAND".

RUN THE DEMO
"Proteus Simulation\Resistor-Ohmmeter-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep
the .hex file and the two DLLs beside the project.
  ARD1: Arduino UNO V4.0 running Resistor_Demo.hex, its serial monitor built in
        (window "TEP Arduino UNO - ARD1").
  R1, R2: the ohmmeter. R1 (10k, 5-band) is the known part, R2 (4k7, 4-band) the
        unknown; together they make a divider on A0.
  R3, R4: the overload watch. R3 (100 ohm, 0.25 W) and R4 (2R2, 1 W, 5-band) are
        in series; A1 reads the current through R3.
  1. Press Run. The monitor opens (move it aside). Every second it prints R2's
     value, the nearest E12 value and its bands, then R3's current, resistance
     and power.
  2. Click R2 and press E12 up on its pop-up: the bands on the sheet change and
     the monitor measures the new value.
  3. Click R3 and press E12 down, step by step. Under 100 ohm it goes over its
     0.25 W: the UNO's L LED lights, the monitor says OVERLOAD, and the body
     warms up.
  4. Keep going to 33 ohm and wait. R3 burns out, the circuit opens and the
     monitor prints R3 BURNT OUT.
  5. Press New part on the pop-up, then E12 up, and the circuit comes back.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  +5V - R1 10k - A0 - R2 (unknown) - GND
  +5V - R3 100R - A1 - R4 2R2 - GND
REAL HARDWARE:
 * Do NOT try the burn-out on a bench without care: a real resistor can smoke,
   crack or get hot enough to burn you. Use a low voltage and keep clear.
 * A 2R2 sense resistor in series loses a little voltage. Keep sense resistors
   small and rated for the current.
 * Real colours fade and vary between makers. Check an unknown part with a
   multimeter, and read the code from the end with the bunched bands.

THE DEMO SKETCH ON THE SERIAL MONITOR (Resistor_Demo V1.0, 9600 baud)
EXPECTED MONITOR OUTPUT
  Resistor Library demo - The Engineering Projects
  R2 = 4.70 kohm, nearest E12 = 4.70 kohm, bands Yellow Violet Red
  R3: 48.9 mA, 100.1 ohm, 0.239 W

PROPERTIES (double-click the part > Edit Properties)
  Resistance                  the value: 1k, 4k7, 2.2M, 0R47, R47, 1000, 1Meg
  Tolerance, %                4-band: 5 or 10, 5-band: 1, 2, 0.5, 0.25 or 0.1
  Power rating, W             0.125, 0.25, 0.5, 1 or 2
  Colour bands while stopped  the dropdown: see THE BANDS above
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 TEPRESISTOR.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
* The bands on the sheet do not match the value: press Run once, or set Colour
  bands while stopped. See THE BANDS above.
* The pop-up does not open: click the body of the resistor at Run (it stays
  closed until you click it).
* The Event log says a value is not a resistance: the Resistance box holds
  something other than a number; the part uses 1k and carries on.
* No current flows and the body is black: it burnt out. New part on the pop-up,
  or Stop and Run.
* The part is not simulated: TEPRESISTOR.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/resistor-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 resistor model (TEPRESISTOR.DLL), the symbols and artwork 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 model uses 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\Resistor_Demo\Resistor_Demo.ino, select Arduino Uno and
use Sketch > Export Compiled Binary. Replace the simulation's .hex with the
exported HEX. The sketch needs 7,470 bytes of flash (23 % of the UNO) and 335
bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the resistance at any voltage, either way round; the power it burns;
the body temperature (a rise of 130 C at the rating, time constants of 3 s for
0.125 W up to 20 s for 2 W); charring and opening at 350 C.
Not modelled: the change of resistance with temperature, the small inductance
and capacitance of a real part, pulse ratings, the spread of real parts inside
their tolerance (the simulation uses the exact value), voltage breakdown (the
Check page only warns over 250 V).

VERSION
TEP Resistor library V1.0 (Nov 2026). Devices RESISTOR4BANDTEP and
RESISTOR5BANDTEP (TEPRESISTOR.LIB / TEPRESISTOR.DLL). Demo sketch Resistor_Demo
V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino Library V4.0) with its built-in
serial monitor.