Hi everyone, I am lost as to where to look and start trying to get a section of code for showing a max result in the past x-amount of time. For example i am programming a Co2 monitor for my office space, and on the LCD / Serial monitor i want it to display the highest PPM recorded in the last hour…

Welcome to the forum! Most people do this with a "circular buffer" or queue that contains only the last 24 hours of data. Google those terms for code examples. The size of that buffer (array) is limited on most Arduinos, so choose your sample rate carefully.

Help with max and average result in last 24 hours

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Help with max and average result in last 24 hours

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