Double-check your file path. If you placed the files in Program Files but your specific installation reads from ProgramData , Proteus will not display the sensor in the item picker.
Search for (or the specific keyword designated by your downloaded library) and add it to your workspace. Search for and add an Arduino Uno board model.
To use an "exclusive" or third-party YF-S201 model in Proteus, follow these installation steps: Download the Files yfs201 proteus library exclusive
Proteus relies on spice models or VSM (Virtual System Modeling) DLLs to simulate components. Since a dedicated .MOD or .IDX library file explicitly named "YF-S201" does not exist in standard or third-party hobbyist libraries, you must mimic its behavior using standard electronic components.
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How to Add Arduino UNO Library to Proteus | Step-by-Step Guide
Because of its standard 1/2-inch pipe interface, 3-wire configuration (VCC, GND, and Pulse Output), and low cost, it has become the standard for makers and professionals alike. The Challenge of Proteus Simulation Search for and add an Arduino Uno board model
The exclusive library uses a "Pull-up" configuration. Add a 10k resistor from OUT to VCC in your schematic. The model expects an open-collector output.
The YFS201 Proteus library exclusive models the physical characteristics of the sensor. When simulated, it generates a pulse signal that matches the real-world frequency-to-flow rate formula:
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Ensure the high voltage is set to 5V and low voltage to 0V . Writing the Arduino Simulation Firmware