Other
“In this Instructable, I will walk you through the steps to build an Precise Air Quality monitoring system. It consists of an Arduino R3, 2 Grove sensors along with 2 other MQ gas sensors to keep the data in check …
Content for MQ-138
Sensitive material of MQ138 gas sensor is SnO2, which with lower conductivity in clean air. When the target Organic Steam exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration. MQ138 gas sensor has high sensitity to Toluene, Acetone, Ethanol and Formaldehyde, also to other organic steam. The sensor could be used to detect different organic steam, it is with low cost and suitable for different application.