Product Description
| Product Features: The gas-sensitive material used in the MQ-8 gas sensor is tin dioxide (SnO2), which has low conductivity in clean air. When sensitive gases are present in the environment in which the sensor is located, the conductivity of the sensor increases with the increase of the concentration of combustible gases in the air. There are different resistance values for different concentrations, and a simple circuit can be used to convert the change in conductivity into an output signal corresponding to the concentration of that gas. The MQ-8 gas sensor is highly sensitive to hydrogen and is ideal for monitoring other hydrogen-containing gases. This sensor can detect a wide range of hydrogen-containing gases, especially city gas, and is a low-cost sensor for a wide range of applications for monitoring hydrogen leakage in homes or industries. It is not interfered with by ethanol vapor, oil fumes, carbon monoxide and other gases. The sensor is specially equipped with M3 fixed mounting hole, using a wide voltage LM393 comparator, clean signal, good waveform, strong driving capacity, more than 15mA, and adjustable precision potentiometer to adjust the sensitivity. Product Parameters: Operating voltage: 5VDC Power consumption (current): 150mA Output Form: Analog and Digital Output |
| Connect VCC and GND, and the module power indicator will turn on. Before use, the power supply should be warmed up for at least 2 minutes, and it is normal for the sensor to heat up slightly, because there is a heating wire inside, and it will not be normal if it is hot. When the module has no sensitive gas influence or the gas concentration does not exceed the set threshold, the digital interface DO port outputs a high level, and the voltage of the analog interface A0 is basically about 0v, when the gas influence exceeds the set threshold, the module digital interface D0 outputs a low level, the digital indicator light is on, and the voltage output of the analog interface A0 will slowly increase with the influence of gas. AO output: 0.1-0.3V (relatively no pollution), the concentration voltage can be as high as about 4V; the concentration of the potentiometer (only for the sensitivity of TTL output) is adjusted clockwise; the small board digital output D0 can be directly connected to the microcontroller, and the high and low levels can be detected through the microcontroller, so as to detect ambient gases; The small board digital output DO can directly drive the relay module of our store, so that it can form a gas switch; The small board digital output DO can directly drive the active buzzer module of our store, which can form a gas alarm; The analog output AO of the small board can be connected to the AD module of our store, and the approximate value of the ambient gas concentration can be obtained through AD conversion. |
| Note: Wiring correctly! Do not connect the positive and negative to burn the electronic components of the board. The sensor probe sensitivity is nonlinear, so the analog output voltage is not linear with the sensitive gas concentration. This module does not provide an analog output voltage concentration curve, please measure the voltage concentration control value according to the actual comparison of standard instruments, and there will be different concentrations from the distance from the sensitive source gas during the actual test. 5.1ohm resistance is strung into the heating loop of the sensor, which can protect the heating wire from the impact of cold power. |
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