Temperature control by using PIC28f452

[mpe_10]

hi...

I have two question to the pic18f452 experts..

1- I'm working on a project about temperature PID controller using PIC18f452 and I'm asking if anybody work on a such project to give some tips and if possible the c algorithm for the pid controller?


2- my second question is about the microcontroller analog output .How can I generate an analog signal from the microcontroller to control the proportional valve?

before I end this post, i want ask you about a book which is "Embedded Design with the PIC18F452". Could I get this book free online

 

[mpe_10]

up

 

[lambtron]

How can I generate an analog signal from the microcontroller to control the proportional valve?

You can use a DAC (digital to analog converter).

Also, if the automation loop time is sufficiently long you can use a pwm output from the microcontroller, followed by a low pass filter, to generate an analog signal.

 

[mpe_10]

Thanks lambtron for your response ..

after my search for a dac i found mcp4921 from microchip..

do you have any idea how to program the PIC with the dac in order to get analog signal??

in addition..

could you give a C algorithm for PID controller..

thanks again

 

[lambtron]

... i found mcp4921 from microchip.. do you have any idea how to program the PIC with the dac in order to get analog signal?

Have a look at this **broken link removed**.

could you give a C algorithm for PID controller.

There are numerous examples of this on the Internet. For example, see Appendix C of this article.

 

[mpe_10]

Dear lambtron...

thank you very much for your help...I really benefit from your posts...


thanks again