Kit 9 sensori gas per Raspberry/Arduino

KIT di 9 sensori gas:
MQ-2 MQ-3 MQ-4 MQ-5 MQ-6 MQ-7 MQ-8 MQ-9 MQ-135 1pz per modello

Module Application:
Can be used for home and factory gas leak monitoring device, suitable for liquefied gas, butane, propane, methane, smoke and other detection;
Module Features:
1, the use of high-quality double-panel design, with power indicator and TTL signal output instructions;
2, TTL output valid signal is low. (When the output low signal lights, can be directly connected to the microcontroller or relay module)
3, with DO switch signal (TTL) output and AO analog signal output;
4, the analog output voltage with the higher the higher the voltage the higher the voltage.
5, the liquefied petroleum gas, natural gas, city gas, smoke has a better sensitivity.
6, there are four screw holes to facilitate positioning;
7, product dimensions: 32 (L) * 20 (W) * 22 (H)
8, with long service life and reliable stability
9, fast response to recovery features

Electrical performance:
DO output: TTL digital 0 and 1 (0.1 and 5V)
Input voltage: DC5V Power consumption (current): 150mA
AO output: 0.1-0.3V (relatively no pollution), the maximum concentration of about 4V voltage
Special reminder: the sensor power, the need to preheat 20S or so, the measured data was stable, the sensor fever is a normal phenomenon, because the internal electric wire, if the hot is not normal.

Wiring:
1, VCC: then the power supply positive (5V)
2, GND: Connect the power supply negative
3, AO: analog signal output
4, DO: TTL switch signal output