Hi,
I have a query about the final project which i am thinking to submit .
I am trying to make use of air quality sensor(MQ135) module to be connected to boltIot wifi module to predict future air quality in the area and to send a alert whenever the sensor value goes past the threshold value but i dont know how to interpret the MQ135 sensor value .
I have read many articles and they said we have to calibrate it in NH4 or alcohol medium. I dont have such resources .
Can you help me with this?