MQ-2
1 It could be used for home and factory gas leak monitoring devices, suitable for liquefied gas, butane, propane, methane, alcohol, smoke and other detection;
2 Sensitivity adjustable (blue digital potentiometer adjustment)
3 Working voltage 5V before use, power supply at least warm up for more than 2 minutes, the sensor slightly hot is a normal phenomenon;
4 Output form: a analog voltage output; b digital switch output (0 and 1)
5 With a fixed bolt hole, easy to install
1 VCC 5V operating voltage
2 GND External GND
3 DO small board digital switch output interface (0 and 1)
4 AO small board analog output interface
Using:
1 MQ-2 sensor module is sensitive to ambient liquefied gas, butane, propane, methane, alcohol, smoke and so on.
2 module in the absence of the above gas or gas concentration does not exceed the set threshold, the digital interface DO port output high level, analog interface A0 voltage is basically about 0v, when the gas exceeds the set threshold, the module digital interface D0 output is low Level, analog interface A0 output voltage will gradually increase with the impact of gas;
3 small board digital output D0 can be directly connected with the microcontroller, through the microcontroller to detect high and low levels, which to detect the ambient gas;
4 small board digital output DO can directly drive the shop relay module, which can form a gas switch;
5 small board digital output DO can directly drive our active buzzer module, which can form a gas alarm;
6 small board analog output AO can be connected with the shop AD module, through the AD conversion, you can get the ambient gas concentration accurate value;
MQ-3
Alcohol (ethanol) detection, for motor vehicle drivers and other persons who are prohibited from on-site inspection of drinkers and also for the detection of ethanol vapor in other places
1 Using high-quality double-panel design, with power indicator and TTL signal output instructions;
2 With DO switch signal (TTL) output and AO analog signal output;
3 TTL output valid signal is low. (When the output low signal lights, can be directly connected to the microcontroller or relay module)
4 The analog output voltage, the higher the higher the voltage the higher the voltage.
5 The alcohol detection 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
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively no pollution), the maximum concentration of about 4V voltage
1 VCC: then the power supply positive (5V)
2 GND: Connect the power supply negative
3 DO: TTL switch signal output
4 AO: analog signal output
MQ-7
The gas-sensing material used in the MQ-7 gas sensor is tin oxide (SnO2) with a low conductivity in clean air. The conductivity of the sensor increases with the increase of the concentration of carbon monoxide in the air, and the high temperature (5.0V heating) is used to clean the adsorbed gas at low temperature when the low temperature (1.5V heating) is used to detect the carbon monoxide. The use of a simple circuit can change the conductivity of the gas concentration corresponding to the output signal. MQ-7 gas sensor on the high sensitivity of carbon monoxide, this sensor can detect a variety of carbon monoxide-containing gas, is a variety of applications for low-cost sensor
Function:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively no pollution), the maximum concentration of about 4V voltage
MQ-8
The gas-sensing material used in the MQ-8 gas sensor is tin oxide (SnO2) with a low conductivity in clean air. When there is a combustible gas in the environment in which the sensor is present, the conductivity of the sensor increases as the concentration of combustible gas in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ-8 gas sensor is highly sensitive to hydrogen and is ideal for monitoring other hydrogen-containing gases. This sensor can detect a variety of hydrogen-containing gas, especially the city gas, is a variety of applications for low-cost sensors for home or industrial hydrogen leak monitoring device. Can not be ethanol steam, fumes, carbon monoxide and other gas interference.
Input voltage: DC5V
Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively no pollution), the maximum concentration of about 4V voltage
MQ-135
Description:
The gas-sensing material used in the MQ135 gas sensor is tin oxide (SnO2) with a low conductivity in clean air. When there is a contaminant gas in the environment in which the sensor is located, the conductivity of the sensor increases as the concentration of contaminant gases in the air increases. The change in conductivity can be converted to an output signal corresponding to the gas concentration using a simple circuit. The MQ135 sensor is highly sensitive to ammonia, sulfide, and benzene vapor, and is ideal for smoke and other harmful monitoring. This sensor can detect a variety of harmful gases, is a variety of applications for low-cost sensors. Can be used for home, the environment of harmful gas detection device, suitable for ammonia, aromatic compounds, sulfide, benzene, steam, smoke and other gases harmful gas detection.
1 Using high-quality double-panel design;
2 With power indicator and TTL signal output indicator;
3 There are four screw holes to facilitate positioning;
4 Long life and reliable stability;
5 Fast response to recovery characteristics;
6 On the liquefied petroleum gas, natural gas, city gas, smoke has a better sensitivity.
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively no pollution), the maximum concentration of about 4V voltage
Gas Sensitive Element Test Concentration Range: 10 to 1000ppm
1 VCC: then the power supply positive (5V)
2 GND: Connect the power supply negative
3 DO: TTL switch signal output TTL output valid signal is low. (When the output low signal lights, can be directly connected to the microcontroller or relay module)
4 AO: analog signal output
5 product dimensions: 32 (L) * 20 (W) * 22 (H)
Note: the sensor power, the need to preheat about 20S, the measured data was stable.
