Project Files of AD8232 ECG Heart Monitor Library for Proteus

AD8232 ECG HEART MONITOR LIBRARY FOR PROTEUS - V1.0 (an AD8232 ECG module 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/ad8232-ecg-heart-monitor-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/ad8232-ecg-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
AD8232-ECG-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPAD8232.LIB                                  14.3 KB   the library -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPAD8232.DLL                                 313.5 KB   the model -> MODELS folder
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|-- Proteus Simulation/
|   |-- AD8232-ECG-ArduinoUnoV4.pdsprj                 18.5 KB   the demo project
|   |-- ECG_Demo.hex                                   17.1 KB   the demo firmware
|   |-- TEPAD8232.DLL                                 313.5 KB   copy of the model
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|-- Arduino Code/
|   |-- ECG_Demo/ECG_Demo.ino                           3.1 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~13.3 KB   this file
Total: 2.60 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
An AD8232 single-lead heart monitor module, drawn at true scale (36 x 30 mm) - our own drawing of
the common red module:
  * The AD8232 front end, the 6-pin header (GND, 3.3V, OUTPUT, LO-, LO+, SDN), a 3.5 mm jack for the
    electrode cable (RA black, LA blue,
    RL red), PWR and HR LEDs (HR flashes with every heartbeat).
  * The heart: a lead-I ECG at the electrodes (LA to +IN, RA to -IN) with P, Q, R, S and T waves (R
    1.2 mV); the rate breathes (4 % at
    0.25 Hz) and jitters; RHYTHM PVC puts a premature, wide beat every 6th beat; AFIB drops the P
    waves and makes the rate irregular.
  * The electrodes: breathing wander, mains pickup (MAINS), noise (NOISE).
  * The AD8232 in its datasheet's cardiac monitor setup: gain 100 x 11 = 1100, a two-pole 0.5 Hz
    high-pass and a two-pole 40 Hz low-pass;
    OUTPUT around REFOUT, half of the 3.3 V supply; dc leads-off detection on LO+ / LO- (LEADOFF
    takes the LA electrode off for 2 s); SDN
    low shuts it down (the module pulls SDN up: left open, it runs).
  * Click it at Run for the pop-up: the ECG on paper at 25 mm/s, the electrodes on the chest, the
    heart rate, the RR intervals, the
    leads and the shutdown.
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 "AD8232" in Pick Devices):
  ECGAD8232TEP  "AD8232 ECG Module V1.0" in TEPAD8232.LIB (Biomedical > ECG), prefix U, model
  TEPAD8232.DLL (analog).
                Pins GND, 3.3V, OUTPUT, LO-, LO+, SDN - the header on the left edge, 2.54 mm apart.

THE POP-UP
Click the part at Run. Tabs:
    ECG        the electrodes on the chest (the heart flashing with each beat), the output on ECG
    paper (the last 4 s at 25 mm/s), and
               eight live values: the heart rate, the rhythm, the output, REFOUT and 3.3V, the
               electrodes, LO+ / LO-, SDN, the RR range.
    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 7 Nov 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 demo runs 14.6 simulated seconds in about two minutes
    on our PC.
  * The ECG at OUTPUT: centred on REFOUT 1.65 V (half of 3.3 V); R waves 1.17 - 1.23 V above it, the
    P and T waves and the Q and S dips
    clear on the strip; a little breathing wander and 50 Hz ripple, as set.
  * The heart rate: 72 BPM set, the RR intervals 789 - 879 ms with the breathing (sinus arrhythmia);
    the sketch's detector found every beat
    and printed 69 - 75 BPM (the mean of four RR intervals) - 16 beats by 14.6 s.
  * Leads off (LEADOFF 8 s): LO+ high from 8.000 s, the output at the 3.26 V rail; the sketch
    printed "leads off" and ignored the output;
    at 10.001 s LO+ low and a fast restore - the sketch printed "leads on" and counted again from
    the next beats.
  * SDN left open: the module pulls it up and runs. The pop-up: ECG, 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" (TEPAD8232.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 TEPAD8232.DLL and TEPARDUINO.DLL from "Proteus Model Files" to the MODELS folder
(...\Proteus 8 Professional\MODELS).
4. Delete TEPAD8232.IDX from the LIBRARY folder if it is there (Proteus makes a new index).
5. Start Proteus. In Pick Devices (P) search "AD8232".

RUN THE DEMO
"Proteus Simulation\AD8232-ECG-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file and the DLLs
beside the project.
  ARD1:   Arduino UNO V4.0 running ECG_Demo.hex, its serial monitor built in (window "TEP Arduino
  UNO - ARD1").
  U1:     the AD8232 module (72 BPM, LEADOFF = 8 s): OUTPUT - A0, LO+ - D10, LO- - D11, 3.3V - a
  +3.3V terminal, GND; SDN open.
  1. The sketch samples OUTPUT 250 times a second and finds each beat (slope, squared, averaged, an
  adaptive threshold).
  2. Every beat it prints the RR interval and the heart rate (the mean of four RR intervals), and
  flags an early beat.
  3. At 8 s the LA electrode comes off for 2 s: LO+ high - the sketch prints "leads off" and ignores
  the output until the leads are back.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  3.3V: a 3.3 V supply (the AD8232: 2.0 - 3.5 V); OUTPUT: an analog pin; LO+, LO-: digital pins;
  SDN: open, or 3.3 V logic (never a 5 V
  pin: it is above the AD8232's supply).
REAL HARDWARE:
 * This is not a medical device: never use a hobby ECG module for diagnosis, and never on a person
   connected to mains-powered equipment
   - power the circuit from a battery and keep a computer on its battery while it is connected.
 * The electrodes need good contact: clean skin, fresh gel pads; RA on the right, LA on the left, RL
   low on the right.
 * Movement and muscles add noise: keep still and relaxed while measuring.
 * The output is centred on half the supply: on a 5 V Arduino it uses about two thirds of the ADC's
   range.

THE DEMO SKETCH ON THE SERIAL MONITOR (ECG_Demo V1.0, 9600 baud)
There are no commands. The sketch finds the beats, prints the heart rate, and reports the leads off
and on.
EXPECTED MONITOR OUTPUT
  AD8232 ECG - The Engineering Projects
  t=1.12 s: beat, RR 840 ms, 71 BPM
  t=7.94 s: leads off

PROPERTIES (double-click the part > Edit Properties)
  Heart rate (BPM)                     beats per minute
  Rhythm (RHYTHM)                      NORMAL, PVC (a premature beat every 6th) or AFIB
  Noise (NOISE)                        muscle and electrode noise at the skin, microvolts RMS
  Mains (MAINS)                        the mains pickup's frequency: 50, 60 or 0 for none
  Leads off (LEADOFF)                  the LA electrode comes off at this time for 2 s; 0 = never
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 TEPAD8232.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
* NO SUPPLY: 3.3V is missing or under 2.0 V.
* SHUTDOWN: SDN is low - leave it open or drive it high from 3.3 V logic.
* LEADS OFF: an electrode is off - LO+ or LO- high, the output at a rail; the sketch must ignore the
  output then.
* The heart rate reads double: the detector also triggers on the T wave - raise its threshold or
  lengthen the refractory time.
* The part is not simulated: TEPAD8232.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/ad8232-ecg-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 (TEPAD8232.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\ECG_Demo\ECG_Demo.ino, select Arduino Uno and use Sketch > Export Compiled Binary.
Replace the simulation's .hex with the exported HEX. The sketch needs 6,206 bytes of flash and 396
bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the ECG's waves and its rate variation, three rhythms, breathing wander, mains and noise,
the AD8232's gain and its high-pass
and low-pass filters, the output within the rails, the dc leads-off comparators, the fast restore,
the shutdown.
Not modelled: the right-leg drive loop, the electrodes' half-cell potentials changing, motion
artifacts, the AD8232's own noise.

VERSION
TEP AD8232 ECG library V1.0 (Nov 2026). Device ECGAD8232TEP (TEPAD8232.LIB / TEPAD8232.DLL). Demo
sketch ECG_Demo V1.0. Demo board: ARDUINO UNO V4.0 (TEP Arduino Library V4.0) with its built-in
serial monitor.