You know the drill. You’ve spent three hours designing a beautiful SpO2 and heart-rate monitor. Your ATmega328 is wired perfectly. The I2C pull-ups are exactly 4.7k. You hit play.

The Arduino IDE target .HEX file is uploaded into the virtual microcontroller chip.

Ensure your Arduino VCC and GND pins are globally connected. Proteus sometimes hides power rails.

: Obtain the MAX30100 library files (typically a zip from sources like The Engineering Projects Locate Proteus Directory : Navigate to the folder within your Proteus installation path (usually

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Ensure the download contains .LIB and .IDX files. 2. Locate Your Proteus Library Folder The installation path depends on your Proteus version.

Add a connected to the Arduino TX/RX pins to display the calculated BPM (Beats Per Minute) and SpO2 (Oxygen Saturation) percentages.

Verify the "Model File" field points to the correct .MDF file provided in your download. Simulation Best Practices

Note: If you cannot see ProgramData , open Windows File Explorer, click the tab, and check the box for Hidden items . For Older Proteus 7.x Versions Copy the .IDX and .LIB files.

You can create a that mimics MAX30100 behavior (returns heart rate/SpO₂ values). This requires C++ and Proteus SDK.

If the component appears but the simulation fails with a "No model specified" error:

The MAX30100 is a low-power, high-performance pulse oximeter and heart rate sensor from Maxim Integrated. It measures oxygen saturation (SpO2) and heart rate (HR) using a technique called photoplethysmography (PPG). The sensor is widely used in fitness trackers, smartwatches, and other wearable devices.