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i want to implement a discrete transfer function at z domain with arduino UNO.I know that i must do the inverse z transform and find the difference equation.Afterwards i must use PWM because arduino UNO has not DAC. Is there anyone who knows about this ?and can help me.... i want a code as an example .Thank you.

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At the very least your question should include the nature of the inputs, and it would be helpful if you included the equation in the form to be implemented - ie, document every part of the problem except the Arduino. –  Chris Stratton Jul 4 at 3:12
    
the reference input is a unit step signal 1 volt.i should use pwm and filters for DAC.Have you got any idea ? –  Νίκος-Μάριος Κοκολάκης Jul 9 at 1:04

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