MQ-4 Alcohol Detector Gas Sensor Module

Key Features:

• High-Quality Dual-Panel Design – Ensures durability and stable performance.
• Power & Signal Indicators – Built-in power indicator and TTL signal output instructions for easy monitoring.
• Dual Signal Output:
  • Digital Output (DO) – Provides TTL-level signal (0V or 5V), ideal for microcontrollers and relay modules.
  • Analog Output (AO) – Voltage increases with concentration levels (0.1V to 4V max).
• Fast Response & Recovery – Detects changes quickly for real-time applications.
• Reliable & Long-Lasting – Designed for stability over extended use.
• Easy Installation – Comes with four screw holes for secure mounting.

Technical Specifications:

• Operating Voltage: DC 5V
• Power Consumption: 150mA
• Digital Output (DO): TTL 0 or 1 (0V / 5V)
• Analog Output (AO): 0.1V – 4V (varies with concentration levels)
• Warm-Up Time: ~20 seconds (for stable readings)
• Internal Heating Element: Slight heating is normal due to internal components

Wiring Instructions:

Note: The sensor requires a 20-second warm-up after powering on for stable measurements. A slight heating effect is normal due to the internal heating wire.