Project Files of Piezoelectric Energy Harvester Library for Proteus Simulation

PIEZOELECTRIC ENERGY HARVESTER LIBRARY FOR PROTEUS SIMULATION - V1.0 (the 27 mm piezo disc, 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/piezoelectric-energy-harvester-library-for-proteus.html
Report a bug or suggest a feature (our forum):
  https://www.theengineeringprojects.com/forum/category/motor-driver-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
Piezo-Energy-Harvester-TEP-v1.0/
|-- Proteus Library Files/
|   |-- ArduinoV4TEP.LIB                              201.9 KB   TEP Arduino boards V4.0 (UNO) -> LIBRARY
|   |-- TEPBRIDGE.LIB                                  10.8 KB   a part the demo uses -> LIBRARY folder
|   |-- TEPPIEZO.LIB                                   11.2 KB   the library -> LIBRARY folder
|   |-- TEPTANTALUM.LIB                                29.8 KB   a part the demo uses -> LIBRARY folder
|-- Proteus Model Files/
|   |-- TEPARDUINO.DLL                                883.5 KB   the Arduino board model -> MODELS folder
|   |-- TEPBRIDGE.DLL                                 284.0 KB   its model -> MODELS folder
|   |-- TEPPIEZO.DLL                                  314.0 KB   the model -> MODELS folder
|   |-- TEPTANTALUM.DLL                               300.5 KB   its model -> MODELS folder
|-- Proteus Simulation/
|   |-- Piezo_Demo.hex                                 16.6 KB   the demo firmware
|   |-- PIEZO-Harvester-Bridge-ArduinoUnoV4.pdsprj     19.8 KB   the demo project
|   |-- TEPARDUINO.DLL                                883.5 KB   copy of the board model
|   |-- TEPBRIDGE.DLL                                 284.0 KB   copy of its model
|   |-- TEPPIEZO.DLL                                  314.0 KB   copy of the model
|   |-- TEPTANTALUM.DLL                               300.5 KB   copy of its model
|-- Arduino Code/
|   |-- Piezo_Demo/Piezo_Demo.ino                       3.6 KB   the demo sketch (source of the .hex)
|-- README.txt                                        ~14.9 KB   this file
Total: 3.78 MB (unzipped). The C++ source code of the models is not included.

WHAT IS IT?
The 27 mm piezoelectric disc - the brass diaphragm with a ceramic layer that every "footstep power"
project uses - as an energy
harvester, drawn at true scale from above (the brass plate 27 mm, the ceramic 19.7 mm, the red and
black leads; our own drawing, no
maker's mark). Press it and it gives a pulse of charge; let it go and it gives the pulse back the
other way:
  * The charge: 40 nC for every newton on the disc (our figure for a disc pressed at its centre). A
    10 N press moves 400 nC. The
    model hands the circuit exactly the charge the force has moved, so the output is AC - a pulse on
    the press, the opposite pulse
    on the release - and a steady push gives nothing.
  * The disc's own capacitance, 20 nF (the makers' sheets), sits across its leads with a 500 Mohm
    leak: with nothing connected a
    10 N press shows 400 nC / 20 nF = 20 V. A load, or a rectifier and a capacitor, takes that
    charge at a lower voltage.
  * What presses it: MODE STEPS (FORCE newtons, RATE presses a second), VIBRATE (a sine of FORCE
    newtons at RATE hertz) or DEMO
    (walking 10 N twice a second from 0.3 s, running 20 N four times a second from 4.3 s, a stop at
    8.3 s).
  * On the sheet the disc writes PRESSED with the force above itself and the count of presses below
    it at Run. Click it at Run
    for the pop-up: the disc bending under the force, one step with its two pulses and the moment
    now, eight 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 "PIEZO" in Pick Devices):
  PIEZODISC27TEP  "Piezo Energy Harvester 27 mm V1.0" in TEPPIEZO.LIB (Electromechanical >
  Generators), prefix PZ, model
                  TEPPIEZO.DLL (analog). Pins + and - on the left (the red and black leads). The
                  name starts with P so that it
                  sorts after the embedded ARDUINO UNO V4.0.

THE POP-UP
Click the part at Run. Tabs:
    Press      chips: Stop, Tap once, Walk (2 presses a second), Run (4 a second), Vibrate 50 Hz;
    the force 5, 10, 20, 40 N; Demo.
               The disc from the side, bending under the force, with its volts and microamps; one
               step: the force (orange) and
               the current the changing force makes (green) - up on the press, down on the release -
               with a cursor at the moment
               now; eight live values: the force, the presses and their rate, the volts across the
               disc now, the highest and the
               lowest, the charge of one press, its open-circuit volts, the charge and the energy
               delivered so far.
    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 16 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 demo as shipped (Piezo_Demo, MODE DEMO, C1 10 uF, BR1 DB107), one run (pzfinal1), the model's
own pauses:
  * Walking (10 N, twice a second, from 0.3 s): 400 nC a press, 20 V if nothing were connected. The
    first press delivered 0.40 uC; after 8 presses (4.2 s) 6.15 uC and 7.13 uJ had left the disc;
    the capacitor at 0.62 V, charging 0.16 V/s.
  * Running (20 N, four times a second, from 4.3 s): 800 nC a press; at 6.35 s 17 presses, 18.81 uC,
    34.64 uJ; the capacitor charging 0.61 V/s at first and 0.54 V/s at the end.
  * At 8.2 s (24 presses): the disc has delivered 29.28 uC and 69.47 uJ and has swung between -3.8 V
    and +3.8 V; the capacitor holds 2.92 V = 29.2 uC, 42.6 uJ (the bridge's diode drops took the
    rest). The sketch counted 48 pulses (a press and a release for each of the 24 presses) and lit
    the LED from 2 V.
  * At rest from 8.3 s: the capacitor keeps 2.91 V to the end of the run (10.4 s). 202 s for the
    10.4 s of the run (the extra pauses for the animated picture included).

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

RUN THE DEMO
"Proteus Simulation\PIEZO-Harvester-Bridge-ArduinoUnoV4.pdsprj" (an A4 sheet) - keep the .hex file
and the DLLs beside the project.
  ARD1:   Arduino UNO V4.0 running Piezo_Demo.hex, its serial monitor built in (window "TEP Arduino
  UNO - ARD1").
  PZ1:    the piezo disc, MODE DEMO: walking (10 N, twice a second) from 0.3 s, running (20 N, four
  times a second) from 4.3 s,
          at rest from 8.3 s. Its + goes to the bridge's AC2, its - to AC1.
  BR1:    our bridge rectifier (BRIDGEDB107TEP): it turns both pulses of every step the same way. P
  to the capacitor, N to GND.
  C1:     our tantalum capacitor, 10 uF, the store: + on the bridge's P and on the UNO's A0, - on
  GND.
          The monitor prints the capacitor's volts, the energy in it, the pulses counted and how
          fast it charges; the UNO's LED
          lights at 2 V.
Closed the monitor? Click the UNO's USB port.

WIRING (the same in Proteus and on a real board)
  The disc's two leads to the two AC pins of a bridge rectifier; the bridge's + to a storage
  capacitor and to your load, its -
  to ground. Read the capacitor with an analog pin (keep it under 5 V).
REAL HARDWARE:
 * Glue or clamp the disc by its brass rim only and press the centre: the bending makes the charge.
   A flat support gives almost none.
 * One disc gives microjoules a step: real footstep tiles use many discs, and a harvester chip
   instead of a plain bridge.
 * Use small-signal or Schottky diodes and a low-leak capacitor (ceramic, film or tantalum): a leaky
   electrolytic eats the charge.
 * A hard knock can give 50 V and more with nothing connected, and too much force cracks the
   ceramic.

THE DEMO SKETCH ON THE SERIAL MONITOR (Piezo_Demo V1.0, 9600 baud)
The sketch reports every 500 ms. Type a command:
  reset      forget the pulses       rate 1000      report every 1000 ms       help
EXPECTED MONITOR OUTPUT
  Piezo Energy Harvester demo - The Engineering Projects
  Cap 0.62 V  1.9 uJ  pulses 16  charging 0.16 V/s
  Cap 2.92 V  42.6 uJ  pulses 48  holding  - enough to flash an LED

PROPERTIES (double-click the part > Edit Properties)
  What presses it (MODE)               STEPS (footsteps), VIBRATE (a machine shaking it) or DEMO
  (walking, running, a stop) (STEPS)
  Force (FORCE)                        the force of a press in newtons, 1 - 60; the ceramic is safe
  to about 50 N (10)
  Rate (RATE)                          presses a second in STEPS (0.2 - 10), hertz in VIBRATE (5 -
  200) (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 TEPPIEZO.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 output: the disc is at rest (Stop in the pop-up), or the force is steady - only a CHANGE of
  force moves charge.
* The capacitor charges ever more slowly: that is real - every half step the disc must first
  recharge its own 20 nF to the
  capacitor's voltage (and two diode drops) before any charge passes. It stops at about half the
  open-circuit voltage.
* Almost nothing arrives with a small force: 5 N gives 10 V open circuit, and the bridge takes its
  two diode drops each way.
* OVERSTRESS: more than 50 N - a real disc may crack.
* The part is not simulated: TEPPIEZO.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/motor-driver-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 (TEPPIEZO.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\Piezo_Demo\Piezo_Demo.ino, select Arduino Uno and use Sketch > Export Compiled Binary.
Replace the simulation's .hex with the exported HEX. The sketch needs 6,044 bytes of flash and 275
bytes of RAM.

MODEL SCOPE AND LIMITS
Modelled: the charge of the bending disc (40 nC per newton - our figure; real discs differ with
their mounting), its 20 nF
(the makers' sheets) and a 500 Mohm leak (our figure); the press as a force that rises in 15 ms,
holds and falls in 15 ms; a
sine force for vibration; the charge handed over exactly, step by step.
Not modelled: the disc's own resonance at 4.6 kHz (it rings after a knock), the change of its
capacitance and sensitivity with
temperature and age, cracking above 50 N (it is reported, not simulated), sound (it is a buzzer disc
too).

VERSION
TEP Piezo Energy Harvester library V1.0 (Nov 2026). Device PIEZODISC27TEP (TEPPIEZO.LIB /
TEPPIEZO.DLL). Demo sketch Piezo_Demo V1.0. The demo also uses our Bridge Rectifier (TEPBRIDGE) and
Tantalum Capacitor (TEPTANTALUM) parts, shipped in this package. Demo board: ARDUINO UNO V4.0 (TEP
Arduino Library V4.0) with its built-in serial monitor.