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The problem was with the buzzer, somehow was a faulty buzzer, I've managed to replace it and the problem was solved. Thanks everybody for your time trying to help me!


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In this article bri_huang made a nice experiment using an oscilloscope and simple write functions. He calculated the speed of the loop to be 117 kHz even though the microcontroller has a 16 MHz clock. https://learn.sparkfun.com/blog/1687


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