Table 1.

Low-cost sensors parameters used for the multisensory array design.

Sensor	Gas Types	Measurement Range	Data Output	Power Consumption	Resolution	Price
MQ-2	LPG, Propane, CH4	300–10,000 ppm	analog	<900 mW	due to adc = 10 bit	1€
MQ-3	Ethanol, Hexane, Benzine	0.05–10 mg/L	analog	<750 mW	due to adc = 10 bit	1€
MQ-4	CH4, LPG, H2	200–10,000 ppm	analog	<750 mW	due to adc = 10 bit	1€
MQ-5	iso-butane, propane	200–10,000 ppm	analog	<800 mW	due to adc = 10 bit	1€
MQ-6	iso-butane, propane	200–10,000 ppm	analog	<750 mW	due to adc = 10 bit	1€
MQ-7	CO, H2	20–2000 ppm	analog	<350 mW	due to adc = 10 bit	1€
MQ-8	H2	100–10,000 ppm	analog	<800 mW	due to adc = 10 bit	2€
MQ-135	C6H6, NH3	10–1000 ppm	analog	<800 mW	due to adc = 10 bit	1€
TGS 822	C6H6, Acetone, Hexane	50–1000 ppm	analog	<660 mW	due to adc = 10 bit	6€
PMS 7003	PM1.0, PM2.5, PM10	0–1000 μg/m3	digital	<500 mW	1 ug/m3	13€