[SOLVED] PID implementation on 8bit microcontroller PIC16f877a

[--BawA--]

hey , i want to implement the PID on PIC16F877a, i am using mikroc pro for coding.
the input feedback data read by the adc can vary from 0 to 1023 (10 bit),
on the basis of input data from ADC , the pwm will be generated to keep the ouput voltage constant. the duty cycle of pwm can vary from 0 to 250.
0 corresponds to 0 volts at the output , while 250 corresponds to 20v at the output ,
i want to keep the output at 14v constant .
so how to implement the PID in mikroc , can anyone give me some sample code or algo to implemnt this.?

 

[Kripton2035]

here is an example with an arduino
should be easy to understand and/or port to mikroc

http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/

you should also read the AN937 from microchip. it implements a PID with a pic18 and in asm but all the main principles are detailed.
**broken link removed**

 

[--BawA--]

The problem is .should i map the 10 bit data to 8bit before implementing the pid or not?