Double-click the sensor from the search results and place it onto your schematic sheet. Connect the Pins: VCC: Connect to a +5V power source. GND: Connect to the ground terminal.
Scripts that simulate the gas concentration data ( How to Download the MQ135 Library for Proteus
If "MQ135" does not appear in the Pick Devices menu, the files were likely pasted into the wrong directory. Double-check if your version of Proteus stores libraries in the ProgramData path instead of Program Files (x86) .
Copy the .LIB , .IDX , and optionally .HEX (if simulation code is needed) files from the downloaded folder.
Search for a trusted electronics community website (such as Engineering Projects, GitHub, or The Engineering Projects) hosting the MQ135 Proteus Library.
Download the compressed ZIP or RAR archive containing the MQ135 sensor files.
: If your download includes a .MOD file, paste it into the MODELS folder within the same Proteus directory.
The is a cornerstone component in air quality monitoring projects, capable of detecting noxious gases like ammonia ( NH3cap N cap H sub 3
Note: The ProgramData folder is a hidden folder by default in Windows. To view it, open File Explorer, click the tab at the top, and check the box for Hidden items . Step 2: Copy and Paste the Files Copy both the extracted .LIB and .IDX files.
When searching for libraries, you often see “UPD” in file names (e.g., MQ135_UPD_Proteus_Lib.zip ). – indicating that the library has been modified to:
Downloading and Installing the MQ135 Gas Sensor Library for Proteus
Select the sensor from the results and place it on your workspace.
Identify short circuits, wrong pin configurations, or logic errors before soldering hardware.
Click the folder icon and select the file you downloaded earlier. Click OK . 🧪 Step 4: Simulating Gas Levels
) corresponding to gas concentration. Connect this pin to an Analog-to-Digital Converter (ADC) pin on your microcontroller (e.g., pin A0 on an Arduino Uno).
MQ135SensorTEP.LIB (or similar name depending on the creator) MQ135SensorTEP.IDX Step-by-Step Installation Guide for Proteus