MQ-9 MQ9 Carbon Monoxide and Fuel Gas Sensor for Arduino

Features:

• Suitable for monitoring gas leaks in residential or industrial installations.
• High sensitivity to CARBON MONOXIDE, METHANE, and LPG.
• High-quality dual board design, with power indication and TTL signal output instructions.
• DO signal output (TTL) and analog output AO.
• The valid TTL signal is low (when the output signal is low, it can be directly connected to a microcontroller or relay module).
• The voltage of the analog output: the higher the concentration, the higher the voltage.
• Four screw holes for easy mounting.
• Long lifespan and stability, fast response and recovery.

Specifications:

• Input Voltage: DC 5±0.2V
• Capacity: 150mA
• DO Output: TTL digital 0 and 1 (0.1 and 5V)
• AO Output: 0.1-0.3V (relatively clean), the maximum concentration voltage is about 4V.
• Dimensions: 32(L) * 20(W) * 22(H) mm

Connection Method:

• VCC - positive pole (5V)
• GND - negative pole
• DO - TTL signal change output
• AO - analog signal output