Although it may sound old fashioned - pen and paper is still a good debugging tool. Writing down what you see, what you expect.Write down how a variable changes when you read through the code helps a lot.You can also use one or more free pins and a LED to check paths.Sometimes for fast signals another Arduino can be a tool of choice (read data from serial or i2C and compare it with what you expect.What kind of application are you trying to debug?Can you post the code?
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