Since you want more details, here’s a complete step-by-step guide to adding Arduino Uno, Nano, Mega, and other models in Proteus 8 Professional (works for most versions).

Method 1: Installing Arduino(what is Arduino?) Library in Proteus (Easiest Way)
Step 1: Download Arduino Library for Proteus

1. Recommended Libraries:

• Arduino Library for Proteus (TEP Version)
• Proteus Arduino Mega 2560 Library
• Proteus Arduino Nano Library

2. Download the .ZIP file (usually contains .LIB, .IDX, and sometimes .HEX files).

Step 2: Install the Library in Proteus

1. Extract the .ZIP file (e.g., ArduinoTEP.zip).

2. Copy the following files:

• ArduinoUnoTEP.LIB (or ArduinoMegaTEP.LIB, ArduinoNanoTEP.LIB)
• ArduinoUnoTEP.IDX (index file)
• (Optional) ArduinoUnoTEP.HEX (pre-compiled firmware)

3. Paste them into Proteus Library Folder:

Default path (Windows):

C:\Program Files (x86)\Labcenter Electronics\Proteus 8 Professional\DATA\LIBRARY
If Proteus is installed elsewhere, find the LIBRARY folder inside the installation directory.

4. Restart Proteus (important!).

Step 3: Find Arduino in Proteus

1. Open Proteus ISIS.

2. Click Component Mode § → Pick Device §.

3. Search for:

• Arduino Uno R3 (TEP version)
• Arduino Mega 2560 (if installed)
• Arduino Nano (if installed)

4. Place it on the schematic.

Method 2: Simulating Arduino Using AVR Microcontroller (Manual Setup)
If you don’t want to install libraries, you can manually simulate Arduino using an AVR chip (e.g., ATmega328P for Uno, ATmega2560 for Mega).

Step 1: Add AVR Microcontroller

1. Search for:

• ATMEGA328P (Arduino Uno)
• ATMEGA2560 (Arduino Mega)
• ATMEGA168 (Arduino Nano)

2. Place it on the schematic.

Step 2: Configure the Microcontroller

1. Double-click the microcontroller.

2. Load the HEX file:

• If you have a compiled .hex file from Arduino IDE, browse and select it.
• If not, you can use a pre-compiled HEX file (e.g., Blink.hex for testing).

3. Set Clock Frequency:

• 16 MHz (Uno, Nano)
• 16 MHz or 8 MHz (Mega)

Step 3: Add Required Components
For Arduino Uno Simulation:

• 16 MHz Crystal Oscillator (connected to XTAL1 & XTAL2)
• 22pF Capacitors (from XTAL pins to GND)
• 10kΩ Resistor (pull-up on RESET pin)
• Push Button (for manual reset)

For Arduino Nano Simulation:

Same as Uno, but check if your Nano runs at 16 MHz or 8 MHz.

Testing the Arduino in Proteus
Example: Simulating Arduino Blink Program

1. Add an Arduino Uno (or AVR chip with HEX file).
2. Connect an LED + Resistor (220Ω) to Pin 13.
3. Load the Blink HEX file (or compile your own in Arduino IDE and export it).
4. Click "Play" (Run Simulation) – the LED should blink at 1-second intervals.

Troubleshooting Common Issues

Final Recommendations

• Best for Beginners: Use Method 1 (pre-installed Arduino libraries).
• Best for Advanced Users: Use Method 2 (AVR chip + HEX file).
• Always test simple programs first (e.g., Blink) before complex simulations.