Description
Schematic
MQ2
The MQ2 sensor is an analog gas sensor that is used to detect gas leaks. It is suitable for the detection of combustible gas and smoke in concentrations of 300 to 10,000 ppm. It has high sensitivity (adjustable by potentiometer to activate digital output) and a fast response time. It is composed of an Al2O3 ceramic microtube, it has a sensitive layer of Tin Dioxide (SnO2), the measuring electrode and a heater. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Heating voltage: 5v
- Load resistor: adjustable with potentiometer.
- Heating resistor: 33Ω ±5%
- Consumption: <800mW
- RL: 1K
MQ3
The MQ3 sensor is very sensitive to alcohol and less sensitive to benzine, it is also sensitive to gases such as LPG, Hexane, CO, CH4 but with very low sensitivity, which can be neglected if there is a low concentration of these. It has high sensitivity (adjustable by potentiometer to activate digital output) and a fast response time. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Concentration:0.05-10mg/L Alcohol
- Digital output (adjustable with potentiometer) y analog: 0-5V.
- RL: 1K
MQ4
This gas sensor is sensitive to Methane and Compressed Natural Gas (GNP). It has high sensitivity (adjustable by potentiometer) and a fast response time. It has a sensitive layer of Tin Dioxide (SnO2). The heater needs to be activated at 5V. Low sensitivity to alcohol The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Concentration: 300-10000ppm Metano
- Heating temperature: 5V.
- Adjustable sensivity with potentiometer.
- Temperature and Humidity: 20℃±2℃; 65%±5%
- RL: 1K
MQ5
This gas sensor is sensitive to Natural Gas (LPG). It has high sensitivity (adjustable by potentiometer) and a fast response time. It has a sensitive layer of Tin Dioxide (SnO2). The heater needs to be activated at 5V. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Concentration: 200-10000ppm LPG
- Heating temperature: 5V.
- Adjustable sensivity with potentiometer.
- Heating resistor: 31Ω±10%
- Temperature and humidity: 20℃±2℃; 65%±5%
- RL: 1K
MQ6
This gas sensor is sensitive to Butane Gas (C4H10). It has high sensitivity (adjustable by potentiometer) and a fast response time. It has a sensitive layer of Tin Dioxide (SnO2). The heater needs to be activated at 5V.
Characteristics:
- Power: 5V
- Concentration: 200-10000ppm LPG
- Heating temperature: 5V.
- Adjustable sensivity with potentiometer.
- Heating resistor: 33Ω±5%
- Temperature: -10℃ 50℃
- RL: 1K
MQ8
This gas sensor is sensitive to Hydrogen Gas (H2). It has high sensitivity (adjustable by potentiometer) and a fast response time. It has a sensitive layer of Tin Dioxide (SnO2). The heater needs to be activated at 5V. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Concentration: 100-10000ppm Hydrogen
- Heating temperature: 5V.
- Adjustable sensivity with potentiometer.
- Heating resistor: 31Ω±5%
- Temperature: -10℃ 50℃
- RL: 1K
MQ9
This gas sensor is sensitive to carbon monoxide (CO), but it is also sensitive to flammable gases (Natural Gas and Butane). It has high sensitivity (adjustable by potentiometer) and a fast response time. It has a sensitive layer of Tin Dioxide (SnO2). Carbon monoxide is detected at low heating temperature (1.4V) by high and low temperature cycles. The electrical conductivity increases with the concentration of carbon monoxide in the air. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characteristics:
- Power: 5V
- Concentration: 20-2000ppm CO, 500ppm-10000ppm CH4, 500ppm-10000ppm LPG
- Heating temperature: High(5V), Low (1.4V).
- Adjustable sensivity with potentiometer.
- Heating resistor: 31Ω±3Ω(ambient temperature)
- Heating power: ≤350mW
- Temperature and humidity: -20℃ 50℃
- RL: 1K
MQ135
The MQ-135 sensor is used in air quality control equipment for buildings and offices, they are suitable for the detection of NH3, NOx, alcohol, benzene, smoke, CO2, etc. The sensor has 6 pins, 4 for the measurement of the signal and 2 for the heater, however the module directly has an analog pin, another digital, in addition to power and ground.
Characterístics:
- Power: 5V
- Concentration: 20-2000ppm CO
- Heating temperature: 5V
- Adjustable sensivity with potentiometer.
- Heating resistor: 33Ω±5% (Ambient temperature)
- Heating power: ≤800mW
- Temperature: -10℃ 45℃
- RL: 1K
