HELP..... mq2 reading problem

Hey guys yesterday i bought a MQ2 gas sensor i tried it but the reading is like always less than 25 but itis usually reads 5 or 3 or 2 even if there is a gas or smoke it dont change i let it preheat in the first time for 20 sec and now for 30 mins and changed the sensitivity and still no new
the code:

Please follow the advice given in the link below when posting code, in particular the section entitled 'Posting code and common code problems'

Use code tags (the </> icon above the compose window) to make it easier to read and copy for examination

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.