MQ-2 smoke sensor with white terminal details

1. signal output indicator.   

2. two-way signal output (analog output and TTL level output) 

3. TTL output, low level  for valid signal.(when output low level,  signal light is on, can directly connect MCU) 

4. analog output 0 ~ 5V voltage, the higher the concentration, the higher the voltage.

5. good sensitivity for liquefied petroleum gas, natural gas and city gas. 

6. long service life and reliable stability

7. quick response and recovery