PID Controller Implementation in Software - Phil's Lab #6

⏵Hardware and PCB design course: https://www.phils-lab.net/courses Source code available here: https://github.com/pms67/PID How to implement a PID controller in software using C, discussing theory and practical considerations. Demonstration of PID controller code using a custom flight simulator. If you're enjoying my content, please consider becoming a patron: https://www.patreon.com/phils94 [NOTE] Something I forgot to mention in the video! Note on 'derivative-on-measurement': Since the 'error signal' effectively going into the differentiator does not depend on the setpoint: e[n] = 0 - measurement, and therefore (e[n] - e[n - 1]) = (0 - measurement) - (0 - prevMeasurement) = -Kd * (measurement - prevMeasurement). Note the minus sign compared to derivative-on-error! I've made the change in the Git repo - before you would have had to use a negative Kd gain to get the same result. Now you can, as normal with derivative-on-error, use a positive Kd gain as usual. Additional note: The derivative low-pass filter can be controlled by the constant 'tau', which is the time constant of the filter (-3dB frequency in Hz, fc = 1 / (2*pi*tau)). A larger value of tau means the signal is filtered more heavily. As tau approaches zero, the differentiator approaches a 'pure differentiator' with no filtering. [TIMESTAMPS] 00:00 Introduction 00:39 Control system basics 02:40 PID representation in continuous domain 04:57 Converting from the continuous to the discrete domain 06:11 PID controller difference equation 07:35 Practical considerations 10:48 Basic software structure 11:53 Implementation in C 18:46 Example: Flight simulator using PID controller code ID: QIBvbJtYjWuHiTG0uCoK