Electronic Projects With Code

How to Fix the “Fatal Error Encountered” in Proteus 8: Missing HEX File

Proteus displays a fatal error when a required TEP HEX file is missing during simulation. Here’s a quick, effective solution to resolve it.

Common Cause: Missing TEP HEX File

This error typically occurs when the component you're attempting to simulate—like an IR sensor—doesn't have the necessary TEP HEX file included.

Step-by-Step Fix for the IR Sensor

1. Locate and download the HEX file for your component—for example, an IR sensor library with the required .hex file.
2. In Proteus, double-click the IR sensor component to open its properties.
3. Click on the File field or button to select and assign the downloaded HEX file.
4. Browse to the downloaded HEX file, select it, and click OK.
5. Run the simulation again—no more fatal error!

Example of the error message in Proteus when a HEX file is missing.

Step 2: Open the component's properties in Proteus.

Step 3: Click the File field to browse for HEX file.

Step 4: Select the HEX file and confirm.

Problem solved—your simulation should now run smoothly.

Download the IR Sensor HEX File

Download the necessary IR sensor HEX library from:

IR Sensor HEX Library for Proteus

For other components, check out alternative HEX file sources such as:

• Infrared Sensor Library for Proteus (The Engineering Projects)

Helpful Amazon-Compatible Electronics for Beginners

Below are some affordable, Arduino‑compatible boards and accessories that pair well with your embedded projects (affiliate links):

CanaKit Raspberry Pi 5 Starter Kit PRO (8 GB, 128 GB)

2× Raspberry Pi Pico Development Board

ELEGOO 37‑in‑1 Sensor Kit

40 pcs Breadboard Jumper Wires

HiLetgo CH340 USB‑Serial Modules (5 pcs)

Note: Elegoo boards are not official Arduino boards but are Arduino IDE compatible and often more affordable.

If you encounter similar issues with other components, try locating their respective HEX files using the resources listed above.

Happy simulating! 🙌