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ploting a graph


I have a nextion 4.3" display and arduino uno. In arduino uno there are two analog input A0 and A1. I want to plot the graph when A0 value reaches certain value( for example A0==+200) graph will start plotting A1 value along x axes and will stop plotting  when A0== - 400. I need help with arduino code. Thank you in advance. 

so, where is your code you need help with ...

just show what you already did so far ...

sometimes a simple "search" is also helpful ...

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