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Intelligent IoT Projects in 7 Days by Agus Kurniawan

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Implementing a PID controller in Python

In this section, we'll build a Python application to implement a PID controller. In general, our program flowchart can be described as follows:

We should not build a PID library from scratch. You can translate the PID controller formula into Python code easily. For implementation, I'm using the PID class from https://github.com/ivmech/ivPID. The following the PID.py file:

import time  class PID:     """PID Controller     """      def __init__(self, P=0.2, I=0.0, D=0.0):          self.Kp = P         self.Ki = I         self.Kd = D          self.sample_time = 0.00         self.current_time = time.time()         self.last_time = self.current_time   self.clear() ...

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