Here’s a concise forum/post you can use to request an MQ-135 gas sensor Proteus library that works (with download link or updated files):

Step 5: Verify Installation

  1. In Proteus, click the Component Mode (P button).
  2. In the Keywords box, type MQ135.
  3. You should see MQ135 Gas Sensor in the results.

Pick the Device: Open Proteus, go to Component Mode (P), and search for "MQ135". Select it and place it on your workspace.

A non-UPD library often fails because it was designed for Proteus 7 or lacks the necessary .IDX and .LIB files. Always prioritize UPD versions.

: Search for "MQ135" in the component picker and place it on your workspace. Configuration : Double-click the sensor in Proteus. In the "Program File" field, browse and select the file that came with your download. : Since Proteus cannot detect real physical gas, use a Logic State Toggle Switch

Step 4: Execute the UPD (Update) Process – THE MOST CRITICAL STEP

This is where most people fail. You need to refresh Proteus’s component database.

By following this guide, you should now have a fully functional MQ135 sensor in your Proteus parts list. You can simulate air quality monitors, smoke detectors, and industrial safety systems without spending a dime on hardware.

Pick Component: Go to Component Mode, click 'P' (Pick from Library), and search for "MQ135". Set the HEX File: Place the sensor on the canvas. Right-click the sensor and select Edit Properties.