MQ137 Interfacing with Arduino. You can directly interface this module with Arduino by connecting digital and analog pins in the Arduino board. The analog pin provides analog value indicating the concentration of gas in the air. Digital pin provides High or Low value by comparing gas concentration with a certain value.
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May 06, 2021· The ammonia gas sensor you looked at will meaure ammonia in air, and it is less sensitive than your nose is. Yes, That is my ideas, I want to determind the total concentration of ammonia in aquarium water. It consists of NH3 and NH4+. As I know, to determind the concentration of NH3, we have to measure the pH and total concentration of ammonia.
The MQ-135 Gas sensor makes it easy to monitor ammonia, benzene, or alcohol air concentration levels using our I2C Mini Module form factor. The MQ135 is connected to an ADC121C 12-Bit Analog to Digital converter, which is capable expanding to 9 gas sensors per I2C port using just two address jumpers (making full use of […]
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Mar 16, 2018· MQ-137 Pin Configuration. You can also use this sensor to get digital output from this pin, by setting a threshold value using the potentiometer. This pin outputs 0-5V analog voltage based on the intensity of the gas. Out of the two H pins, one pin is connected to supply and the other to ground.