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Type of
measurement 		ModelPower
voltage 		Measurement, range, accuracyCommunicationNote
Gas sensor
CO2
VOC 		Sciosense
CCS811 CCS811		3.3V
(1.8 .. 3.6V)		equivalent CO2 (eCO2): 400 ppm .. 32768 ppm
equivalent Total Volatile Organic Compound (eTVOC): 0 ppb .. 29206 ppb.		I²C
default address: 0x5A / 0x5B		Standard (100kbit/s) and fast (400kbit/s) I²C interface
Power Consumption maximum: 46 mW
Gas sensorTemperature measuringHumidity measuring
CO2
Air-quality
Temperature
Humidity 		Sensirion
SCD40-D-R2 SCD40-D-R2		3.3V / 5V
(2.4 .. 5.5V)		CO2 output range: 0 .. 40'000 ppm
CO2 measurement accuracy: ± 40 ppm
Humidity measurement range: 0 %RH .. 100 %RH
Humidity measurement accuracy: ±6 %RH
Temperature measurement range: 10°C .. 60°C
Temperature measurement accuracy: ±1.5 °C		I²C
default address: 0x62		SCL clock frequency: 100 kHz
Gas sensor
Smoke gas
Combustible gas		Winsen
MQ-2 MQ-2		5VFlammable gas concentracion: 300 .. 10'000ppm

Heater Resistance; RH: 29Ω ±3Ω（room tem.）
Heater consumption; PH: ≤950mW
Sensitivity;S: Ro(in air) / Rs (2000 ppm C3H8) ≥ 5
Output Voltage;Vs: 2.5V～4.0V（in 2000 ppm C3H8）
Concentration Slope;α: ≤0.6 (R3000 ppm / R1000 ppm C3H8)		analog signalLifespan: 10 years
Preheat time: Over 24 hour
Gas sensor
Alcohol gas

Small sensitivy: Benzine gas 		Winsen
MQ-3 MQ-3		5VDetecting concentration scope：0.05 mg / 10 mg/L Alcohol

Sensing Resistance: 1 MΩ - 8 MΩ (0.4 mg/L alcohol)		analog signalPreheat time: Over 24 hour
Gas sensor
CH4 gas
Natural gas
LNG

Small sensitivy:
Alcohol
Smoke		Winsen
MQ-4 MQ-4		5VDetecting concentration scope：200-10'000ppm CH4, natural gas

Sensing Resistance: 10KΩ- 60KΩ (1000ppm CH4)		analog signalPreheat time: Over 24 hour
Gas sensor
LPG
Iso-butane
Propane

Small sensitivy:
Alcohol
Smoke		Winsen
MQ-5 MQ-5		5VDetecting concentration scope：200-10'000ppm LPG,LNG, Natural gas, Iso-butane, Propane, Town gas

Sensing Resistance: 10KΩ- 60KΩ (5000 ppm methane)		analog signalPreheat time: Over 24 hour
Gas sensor
Town gas
Natural gas
LPG
LNG
Iso-butane
Propane

Small sensitivy:
Alcohol
Smoke		Winsen
MQ-6 MQ-6		5VDetecting concentration scope：200-10'000ppm LPG ,iso-butane, propane, LNG

Sensing Resistance: 10KΩ- 60KΩ (10'00ppm LPG)		analog signalPreheat time: Over 24 hour
Gas sensor
CO		Winsen
MQ-7 MQ-7		5VDetecting concentration scope：over 300 ppm CO (Carbon Monoxide)

Sensing Resistance: 2KΩ- 20KΩ (100 ppm CO)		analog signalPreheat time: Over 48 hour
Gas sensor
H2

Small sensitivy:
Alcohol
LPG
cooking fumes		Winsen
MQ-8 MQ-8		5VDetecting concentration scope：100-10000ppm Hydrogen (H2)

Sensing Resistance: 10KΩ- 60KΩ (1000 ppm H2)		analog signalPreheat time: Over 24 hour
Gas sensor
CO
CH4 gas
LPG 		Winsen
MQ-9 MQ-9		5VDetecting range：
20 ppm .. 2000 ppm carbon monoxide
500 ppm .. 10'000 ppm CH4
500 ppm .. 10'000 ppm LPG

Sensing Resistance: 2KΩ- 20KΩ (100 ppm CH4)		analog signalPreheat time: Over 48 hour
Gas sensor
NOx
NH3
alcohol
Benzene
smoke
CO2 		Winsen
MQ-135 MQ-135		5VDetecting range：
10 ppm .. 300 ppm NH3
10 ppm .. 1000 ppm Benzene
10 ppm .. 300 ppm Alcohol

Sensing Resistance: 30KΩ- 200KΩ (100 ppm NH3)		analog signalPreheat time: Over 24 hour
Gas sensor
Oxigen 		AlphaSense
O2-A2 O2-A2		5VRange of oxygen sensor: 0..30 %
Load resistance: 47-100 Ω		analog signal-
Gas sensor
Methane
Natural gas 		GL Sciences
TGS-2611 TGS-2611		5VSensor resistance in 5000ppm of methaneat 20°C and 65% R.H.
Sensor resistance: 0.68 .. 6.8 kΩ in 5000 ppm methane		analog signalConditioning period before test: 7 days
Gas sensorTemperature sensorHumidity sensor
CO2
humidity
temperature 		Sensirion
SCD-30 SCD-30		3.3V / 5VHumidity range: 0 .. 100 %RH
Temperature range: -40°C .. 70°C
CO² range: 0 .. 40’000 ppm (I²C, UART), 0 .. 5’000 ppm (PWM)		UART (Modbus Point to Point; TTL Logic), PWM and I²CResponse time: 20s
Sensor lifetime: 15 years
Gas sensor
NO² 		MEMS
GM-102b GM-102		5VDetection Range: 0.1~10ppm (NO²)
Heater Resistance: 80Ω±20Ω（room temperature		analog signal-
Gas sensor
alcohol gas 		MEMS
GM-302b GM-302		5VDetection Range: 1..500ppm (Ethanol vapor)
80Ω±20Ω（room temperature		analog signal-
Gas sensor
Alcohol (C2H5OH)
Hydrogen(H2)
Formaldehyde(CH2O) 		MEMS
GM-502b GM-502		5VDetection: Alcohol (C2H5OH), 10..500ppm
Detection: Hydrogen(H2), 1..1000ppm
Detection: Formaldehyde(CH2O), 10..100ppm		analog signal-
Gas sensor
Carbon monoxide (CO)
Hydrogen (H2) 		MEMS
GM-702b GM-702		5VDetection:
Carbon monoxide sensor (CO) : 10..5000ppm
Hydrogen sensor (H2): 10..500ppm		analog signal-
Gas sensor
Carbon monoxide (CO)
Methane (CH4)
Ethanol (C2H5OH)
Propane (C3H8)
Butane (C4H10)
Hydrogen (H2)
Hydrogen sulfide (H2S)
Ammonia (NH3) 		Fermion
MICS-5524 V1.0 MICS-5524 V1.0		5VThe module is intended for educational and hobby purposes!

Measuring range:
1 .. 1000 ppm (carbon monoxide CO)
10 .. 500ppm (Ethanol C2H5OH)
1 .. 1000ppm (Hydrogen H2)
1 .. 500 ppm (NH3 ammonia)
> 1000 ppm (methane CH4)		analog signal-