תיאור
תיאור המוצר –
Kind tips:
The modules sold in our store (not including kits) are all tested before leaving the factory. If you encounter any problems, please contact us in time.
Data download link: https://pan.baidu.com/s/1AsmWu8THGKYbADe696ax0g Extraction code: q8hh
Product Features:
The gas-sensitive material used by the MQ-7 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. The high and low temperature cycle detection method is used to detect carbon monoxide at low temperature (1.5V heating), and to clean the stray gas adsorbed at low temperature at high temperature (5.0V heating). When there is CO gas in the environment where the sensor is located, the conductivity of the sensor increases as the concentration of combustible gas in the air increases. 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 gas concentration. Carbon monoxide detection device for home and environment. Suitable for the detection of carbon monoxide, gas, etc. The sensor has a special M3 fixed mounting hole and uses a wide voltage LM393 comparator. The signal is clean, the waveform is good, the driving ability is strong, more than 15mA , and it is equipped with an adjustable precision potentiometer to adjust the sensitivity.
Product parameters:
Working voltage: 5VDC
Power consumption (current): 150mA
Output form: analog and digital output
After connecting VCC and GND, the module power indicator light will light up. Before use, the power supply must be preheated for at least 2 minutes. It is normal for the sensor to be slightly heated because there is an electric heating wire inside. If it is hot to the touch, it is abnormal. When the module is not affected by sensitive gases 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. flat, the digital indicator light is on, the voltage output by the analog interface A0 will slowly increase with the influence of the gas, AO output: 0.1-0.3V (relatively pollution-free), the maximum concentration voltage is about 4V; adjust the potentiometer clockwise (only for The sensitivity of TTL output) increases the concentration of sensing; the small board digital output D0 can be directly connected to the microcontroller, and the high and low levels are detected by the microcontroller, thereby detecting ambient gas; the small board digital output DO can directly drive our relay module, which can form a gas switch; the small board digital output DO can directly drive the store’s active buzzer module, thus forming a gas alarm; the small board analog output AO can be connected to the store’s AD module, through AD conversion can obtain the approximate value of ambient gas concentration.
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