Autotuning of PID Algo in 8 bit Microcontroller

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Hello

I wants to implement Autotuning of PID Algo in PIC16 Microcontroller to control temperature.

Most commonly used ziegler method is clear to me with Ultimate Gain and Period Oscillations.

But i want to know how to implement these graphs in C Code. I found somewhere that autotuning function cannot be implemented in 8 bit micros.

Please suggest it whether 8 bit micro can able to do these mathematical calculations or not.
 

It is possible to do using 8bit MCU. Don't need graph analysis, simply count time and temperature based on events
 

Thanks Sachinda_thakur for your reply.

Could you please elaborate more. How to relate time and temperature with PID Autotuning.
 

Any one know how to select the relay amplitude in Relay Based Feedback Method. On what factors is depends.
 

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