unsigned int sensors;// Het aantal sensors definiërenint position = qtrrc.readLine(sensors);
You'll need to provide links to the libraries that you are using, so we can see if you are using them correctly.Code: [Select]unsigned int sensors;// Het aantal sensors definiërenint position = qtrrc.readLine(sensors); Local variables are not initialized. Passing an array of garbage to the function hardly seems like the proper thing to do.All the spaces and blank lines being printed in the manual_calibration() function hardly seem useful. The complete lack of print statements in loop() hardly seems conductive to solving your problem.
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