Mq136 DC 5v H2s hydrogen Iron sulphide Gas Sensor Module qualitative detection
MQ-136 hydrogen sulfide sensor module MQ136 hydrogen sulfide detection sensor
Product description:
Size: 32mm X22mm X27mm &;; nbsp; X wide X high
Main chips: LM393, ZYMQ-136 gas sensors
III. Operating voltage: 5 V DC
IV. Characteristics:
1, with signal output indication.
2, two-way signal output(analog output and TTL level output)
3. TTL output effective signal is low level. (When the output signal lamp is on at low level, it can be directly connected to MCU) & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp;
4, analog output 0 ~ 5V voltage, the higher the concentration the higher the voltage.
5. It has better sensitivity to hydrogen sulfide, liquefied gas, natural gas, city gas and smoke.
6, with long-term service life and reliable stability
7, rapid response recovery characteristics
Applications:
It is suitable for gas leakage monitoring devices in households or factories, and for monitoring devices such as liquefied gas, butane, propane, methane, alcohol, hydrogen, smoke, etc.
Applicable occasions: SCM learning, electronic competition, product development, graduation design...
Explanation: This module is MQ-136 hydrogen sulfide sensor. Please preheat about 20S before use.
The first step is to supply 5V direct current to the module (pay attention to the positive and negative poles, otherwise it is easy to burn the chip).
Step 2: If DOUT and TTL are selected, the output signal can be directly connected to the IO port of MCU or a NPN triode to drive the relay. The potentiometer RP is used here to adjust the threshold of output level jump. The schematic diagram below can be analyzed. When the gas is detected by the sensor, the voltage of the two points of the LM393 pin of the comparator and the gas concentration can be detected by the heel sensor. Degree is proportional. When the concentration exceeds the threshold set by the potentiometer RP, the position of the comparator foot 2 is higher than that of the comparator foot 3. At this time, the comparator foot outputs low level, the LED lamp is on, R3 is the current limiting resistance of the LED lamp, C1 is the filter capacitor. Sensor output low level, on the contrary, when there is no signal, sensor output high level, equal to the power supply voltage.
Step 3: If you choose AOUT and simulate the output, then you don't need a tube potentiometer. You directly connect the AOUT foot to the input of the AD conversion or to a single chip computer with AD function. According to our experience: In a normal environment, that is, an environment where there is no gas to be measured, the voltage value of the sensor output voltage is set as the reference voltage. At this time, the voltage of the AOUT end is about 1V. When the sensor detects the gas to be measured, The voltage increases by 0.1 V. The actual gas concentration increased by 200 ppm(simply: 1 ppm = 1 mg/kg = 1 mg / L = 1 × 10-6 is often used to indicate gas concentration, or solution concentration. According to this parameter, the measured analog voltage value can be converted into a concentration value in a single chip computer. Note: if you are using it for precision instruments, buy the standard calibration instruments on the market, otherwise there is an error because the ratio of output concentration to voltage relationship is not linear, but tends to be linear.
Special reminder: after the sensor is powered on, it needs to preheat about 20S, the measured data is stable, the sensor heating belongs to the normal phenomenon, because there is an electric heating wire inside, if the hot hand is not normal.
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Packing: 1PC
Warranty period: 120
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