Arduino Gas Leak Detection System (Summer 2025)
System Overview / Hardware
Arduino Uno as main controller
MQ-5 gas sensor for combustible gas detection
LED and buzzer for alert outputs
Powered via USB with optional battery support
Project Description
An embedded safety monitoring system developed using an Arduino Uno and MQ-5 gas sensor to detect the presence of LPG, methane, hydrogen, and natural gas. The system continuously monitors gas concentration and provides immediate visual and audible alerts through an LED and buzzer.
Inputs & Outputs
Inputs:
MQ-5 gas sensor (digital threshold output for gas presence)
Power input via Arduino Uno USB or external battery
Outputs:
LED indicator for visual gas detection alert
Buzzer for audible warning when gas is detected
Serial Monitor output for real-time sensor readings and debugging
Gas Detected
No Gas Detected
Results
Reliable detection of LPG, methane and natural gas
Clear alert behavior during gas exposure (LED + Buzzer)
Stable baseline operation with no unintended alerts
Consistent Serial Monitor feedback confirming system state
Solution Methods
Adjusted threshold to balance sensitivity and reduce false positives
Verified behavior through Serial Monitor output and physical alerts
Independently tested LED and buzzer before full system integration
Schematic
System Setup
Code