Description:
This module detects smoke, ammonia, aromatic compounds, sulfur, benzene vapor. Gas-sensitive element test concentration range: 10 to 1000ppm.
Main chip: LM393, MQ-135 gas sensor.
Operating voltage: DC 5V.
Dual signal output (analog output, and TTL level output).
Size: 36x24x25mm (LxWxH)
MQ-135 Sensor Features:
Wide detecting scope
Fast response and High sensitivity
Stable and long life
Operating Voltage is +5V
Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
Analog output voltage: 0V to 5V
Digital output voltage: 0V or 5V (TTL Logic)
Preheat duration 20 seconds
Can be used as a Digital or analog sensor
The Sensitivity of Digital pin can be varied using the potentiometer