@viti
hello everyone thanks for giving me the opportunity to be in this forum I'm starting in this world and I need help ,,, with little knowledge I have the MH-Z14A CO2 senso sensor and ardino board one plus everything I need I have assembled little by little and my developer board 5v at 3.3 ,, but my problem is the code that I should start my ardino one how do I get it someone give me a help please