DESCRIPTION The main chip: LM393, MQ135 gas sensing probe Operating voltage: DC 5V A hazardous gas detection apparatus for the family, the environment, suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gas detection, gas-sensitive element test concentration. Air quality sensor is for detecting a wide range of gases, including NH3, NOx, alcohol, benzene, smoke and CO2. Ideal for use in office or factory, simple drive and monitoring circuit. FEATURE 1. Signal output indicator instructions; 2. Dual signal output (analog output, and TTL level output); 3. TTL output valid signal is low; (output low signal light, which can be accessed microcontroller IO port) 4. Analog output with increasing concentration, the higher the concentration, the higher the voltage; 5. Sulfide, benzene Department of steam, smoke and other harmful gases with high sensitivity; 6. Has a long life and reliable stability; 7. Rapid response recovery characteristics; WHAT'S IN THE PACKAGE 1 x MQ-135 Air Quality Sensor Module
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