i have been trying to check the MHZ19 sensor on arduino uno but i am getting same error every time
please, please never ever again post pictures of text... Not only they are not readable nor usable directly for copy&paste but they use up lots of storage and internet bandwidth which contributes to polluting the planet.
➜ do your part and do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation for your ask).
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Sorry I cannot help your post is gibberish, ie. not readable.
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