Main chip: LM393, gas sensor MQ-9 Operating voltage: DC 3-5V with signal output indication. the dual signal output (analog output and TTL level output). The valid signal from the TTL output is weak, can be connected directly to the microcontroller. Analog output voltage 0 ~ 5V, the higher the concentration, the higher the voltage. with high sensitivity and good selectivity for combustible carbon monoxide (CO) gas with long service life and reliable stability. fast response and recovery features. Size: 36mm X24mm X22mm (L * W * H) MQ-9 high gas sensor for the sensitivity of carbon monoxide, methane, liquefied petroleum gases, the sensor can detect a variety of gases containing carbon monoxide and flammable, is a low cost sensor for a variety of applications.
