PID position control : guide me

[mangood]

Dear member

I want to built a PID position control 

i read the DC position through potentiometer with -128 to 127 [full 360 degree]

so the input to the pid is voltage range between -128 to 127

the input of dc motor is PWM and the motor rotate direction

so the PID output will be PWM 

what about direction bit ??? What will be it circuit

also how to control the speed in same system ?? is thire another PID?? 

best regards

[GerdW]

Hi mangood,

you can have your PID to output a value from -100 to +100 (like % as unit). Then use the sign as direction bit and the value as speed…

[mangood]

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@GerdW wrote:

Hi mangood,

you can have your PID to output a value from -100 to +100 (like % as unit). Then use the sign as direction bit and the value as speed…

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thank you

what about control the position and the speed at same time ???

[nathand · Accepted solution]

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@mangood wrote:

what about control the position and the speed at same time ???

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That's a complicated problem. A quick internet search turned up this paper which describes some possible approaches:

http://www.idt.mdh.se/kurser/ct3340/ht09/ADMINISTRATION/IRCSE09-submissions/ircse09_submission_22.pd...

[mangood]

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@nathand wrote:

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@mangood wrote:

what about control the position and the speed at same time ???

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That's a complicated problem. A quick internet search turned up this paper which describes some possible approaches:

http://www.idt.mdh.se/kurser/ct3340/ht09/ADMINISTRATION/IRCSE09-submissions/ircse09_submission_22.pd...

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okkkkkk
terrific paper