Customer:
I just received MQ138 sensors. Do you have any documents regarding wiring them to ESP32 boards and code samples?
Originally submitted via email support on 24 March 2025. Migrated to the forum for community visibility.
Soldered Support:
Please see the MQ library: GitHub - SolderedElectronics/Soldered-MQ-Gas-Sensor-Arduino-Library: Library for all MQ sensor Soldered Boards. · GitHub
It includes an MQ138 example: https://github.com/SolderedElectronics/Soldered-MQ-Gas-Sensor-Arduino-Library/blob/main/examples/native/MQ-138-ALL/MQ-138-ALL.ino
And for easyC version: https://github.com/SolderedElectronics/Soldered-MQ-Gas-Sensor-Arduino-Library/blob/main/examples/easyC/MQ-138-ALL-easyC/MQ-138-ALL-easyC.ino