I have MQ-4 sensors like the one pictured. No instructions and can't find any regarding the sensitivity pot and how to adjust it. Anyone know? Other tips for these sensors also welcome! :
10pcs MQ-4 Methane Natural Gas Sensor Module Shield Liquefied Electronic Detector Module For - Module Board For Arduino Sensor & Detector Module - - Amazon.com
Methane Gas Sensor Module MQ4 - Senith Electronics
Interface MQ4 Methane gas sensor with Arduino - ElectroVigyan
Mq-4 Mq4 Gas Methane Sensor Module Mq4 For Uno - Replacement Parts - AliExpress
1pcs Mq-4 Gas Methane Sensor Module Mq4 For Arduino Sensor - Sensors - AliExpress