The MQ135 Gas Sensor Library for Proteus allows you to simulate air quality monitoring by detecting gases such as Ammonia ( NH3cap N cap H sub 3 ), Nitrogen Oxides ( NOxcap N cap O sub x ), Alcohol, Benzene, smoke, and CO2cap C cap O sub 2
. Since the MQ135 is not a built-in component in standard Proteus installations, you must download and add an external library to use it in your schematic designs. Where to Download
Several community-contributed libraries are available for download:
The Electronics: Offers a dedicated MQ135 library including simulation HEX files The Electronics.
GitHub Repositories: You can find library files (LIB and IDX) from contributors like satyamkr80 or iamnarendrans.
The Engineering Projects (TEP): Provides a general "Gas Sensor Library" that often includes multiple MQ-series sensors The Engineering Projects. Installation Steps
To get the library working in Proteus 7 or 8, follow these steps:
Extract Files: Download and unzip the library folder. You should see files with extensions like .LIB, .IDX, and sometimes .HEX. Locate Proteus Library Folder:
Proteus 8: Navigate to C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\LIBRARY. Note: ProgramData is a hidden folder; you may need to enable "Hidden Items" in Windows View settings.
Proteus 7: Navigate to C:\Program Files (x86)\Labcenter Electronics\Proteus 7 Professional\LIBRARY. mq135 gas sensor library for proteus download upd work
Copy and Paste: Move the .LIB and .IDX files into the Proteus LIBRARY folder.
Restart Proteus: Close and reopen the software to refresh the component database. How to Use the Sensor in Simulation
Once installed, you can find the sensor by searching for "MQ135" in the Pick Devices window.
Connection: The sensor typically features four pins: VCC (5V), GND, Analog Out (A0), and Digital Out (D0).
HEX File Requirement: For some versions, you must double-click the sensor in your schematic and link the provided .HEX file in the "Program File" property box to enable active simulation behavior.
Simulation Control: Many Proteus gas sensors include a "Test Pin" or logic toggle to simulate different gas concentrations, allowing you to see how your Arduino or microcontroller code reacts to changes. MQ135 Gas Sensor Simulation in proteus - The Electronics
To add the MQ135 Gas Sensor to your Proteus simulation, you need to download and install a specific library file set, as the sensor is not included in the software by default. Download and Files
You can find the MQ135 library for Proteus through sites like The Electronics The Engineering Projects The download usually contains three essential file types:
: These define the component's appearance and behavior in the Proteus library database. The MQ135 Gas Sensor Library for Proteus allows
: This is the "internal firmware" for the sensor model required for the simulation to run properly in Proteus. Installation Steps Extract the Files : Unzip the downloaded library folder to access the Paste into Proteus Library Folder Navigate to your Proteus installation directory. : Typically located at
C:\ProgramData\Labcenter Electronics\Proteus 8 Professional\Data\LIBRARY ProgramData is often a hidden folder : Usually found at
C:\Program Files (x86)\Labcenter Electronics\Proteus 7 Professional\LIBRARY Restart Proteus
: If the software was open, close and reopen it to refresh the component list. Simulating the Sensor
: 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
connected to the "Test Pin" of the sensor. Setting this pin to simulates the presence of gas, triggering a output on the sensor's "OUT" pin. For the Arduino side of your project, you can use the MQ135 Arduino Library to handle the sensor readings and calibration in your code. Arduino Library List Are you planning to interface this sensor with an or a different microcontroller in your simulation?
The biggest concern with Proteus libraries is whether they actually simulate the physics. Here is how this library performs:
Final Verdict: Usable for demonstration and learning of gas sensor interfacing, but not reliable for accurate simulation of real-world gas sensing.
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): Functionality & "Does it Work
Title: Looking for MQ-135 Gas Sensor Library for Proteus (updated / working)
Post: Hi everyone — I need a working MQ-135 gas sensor model/component for Proteus (ISIS) — preferably an updated library or a ready-to-use .LIB/.IDX/.HEX combo that simulates analog gas output (or a simple behavioral model). Requirements:
What I’ve tried:
If you have a working Proteus model, sample circuit, or can point to a reliable download, please share the file or a direct link. Thanks!
(If you want a done-for-you attachment, mention Proteus version and whether you need simulation of gas concentration vs. output voltage.)
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Proteus locks library files when running. Close the software before copying any new files.
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