MQ-3 Gas Sensor Module:

Overview:

• Reliable and efficient gas sensor module
• Designed for detecting alcohol in the air
• Utilizes the MQ-3 sensor for excellent sensitivity

Specifications:

• Model No.: MQ-3
• Heater voltage: 5±0.2V (AC•DC)
• Loop voltage: ≤24V (DC)
• Load resistance: adjustable
• Heating Resistance: 31Ω±3Ω (Room temperature)
• Heating Power: ≤ 900mW
• Surface thermal resistance: 2Kohm-20Kohm (0.4mg/L alcohol)
• Sensitivity: Rs (in air)/Rs (0.4mg/L alcohol) ≥ 5
• Working temperature: 20 degrees ±2 degree
• Humidity: 65%±5%RH
• Signal output light indicator
• Analog and level signal output
• TTL output valid signal is low
• Carbon monoxide detection with better sensitivity
• Long service life and reliable stability
• Rapid response and recovery features

Features:

• Simple to use gas sensor module
• Provides analog output corresponding to gas concentration
• Easy-to-use digital output with adjustable threshold
• Onboard potentiometer for setting maximum gas concentration
• LED indicator for gas presence
• Wide power supply range: 2.5V to 5.0V
• Compact and convenient dimension: 40.0mm x 21.0mm
• Mounting holes for easy installation

Applications:

• Car alcohol alarm systems
• Breathalyzers
• Air quality monitoring
• Industrial safety applications
• Environmental monitoring

How to Use:

• MCU Interface:
  • VCC ↔ 2.5V ~ 5.0V
  • GND ↔ power supply ground
  • AOUT ↔ MCU.IO (analog output)
  • DOUT ↔ MCU.IO (digital output)

Note: The MQ-3 Gas Sensor Module is highly sensitive to alcohol and ethanol gases, making it suitable for various applications where accurate alcohol detection is required.