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Thank you Mr.Sanjoy, you are my sunshine !!!
However, how can I update my yVal and remove the setInterval(), seems like remove it does not make thing work at all. my yVal is a global variable and yVal receive a signal from somewhere, example from serial port. How can we update it automatically without using setInterval() ? If you can make an example with yVal receive data by a click button (I think this method is the same with receiving serial port data) and it plot right after this click !
Thank you so much, sir !