Feature
1, the use of high quality dual panel design, with power and TTL signal output indicator;
2, with DO switch signal (TTL) output and AO analog signal output;
3, TTL output signal is low level. (when the output is low, it can be directly connected to the microcontroller or relay module).
4, analog output voltage, the higher the concentration of higher voltage.
5, the air quality, harmful gas detection has better sensitivity.
6, four screw holes for positioning;
7, product appearance size: 32 (L) *20 (W) *22 (H)
8, has long service life and reliable stability
9, rapid response recovery characteristics

Specifcations
Input voltage: DC5V power (current): 150mA
DO output: TTL number 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relative no pollution), the highest concentration of about 4V
Special remind: sensor is energized, the need to preheat the 20s about, the measured data is stable, heat sensor belongs to the normal phenomenon.) because of the internal electric heating wire, if hot is not normal.
Connection mode:
1, VCC: power supply positive electrode (5V)
2, GND: power supply negative
3, DO:TTL switch signal output
4, AO: analog signal output