Controlling DC motor overshoot

hello everyone,

i working on project need relatively accurate , consistent positioning dc motor. motor sent command of position go to, , power cut motor @ target position, motor has overshoot , goes past target.

i found arduino pid library , attempted use fix overshoot, , seems helping some, i'm not sure if i'm using properly. below sample of code of how i'm using it:

code: [select]


void leftfifteen() {
   
  //checks see if window way or stopped in middle
  midupcheck();
  targetl = 167; //this desired position
  if (!stopcheck(serialdata1)) {
   
    if(enccountl > targetl) { //if current position > target position

      leftwindow.setcontrollerdirection(reverse);
      leftwindow.compute();
      serial.println(f("decreasing angle of left window 15"));
      downleft(speedl); //tell motor move @ specifc speed , direction
 
      while (enccountl > targetl) { //runs while motor isn't @ correct position
       
        //checks requested stop
        if(stopcheck(serialdata1)) {
          break;
        }
      }
      digitalwrite(in2,low);
    }

   //same above if target lower current
    else if(enccountl < targetl) {

      leftwindow.setcontrollerdirection(direct);
      leftwindow.compute();
      serial.println(f("increasing angle of left window 15"));
      upleft(speedl);
        serial.println(speedl);
      while (enccountl < targetl) {
       
        //checks requested stop
        if(stopcheck(serialdata1)) {
          break;
        }
      }
      digitalwrite(in1,low);
    }
  }
}


here line declared pid controller:

code: [select]


pid leftwindow(&enccountl,&speedl,&targetl,2.0,5.0,1.0,direct);
//enccountl = current position
//speedl = speed of motor (pwm)
//targetl = target position


the current position , target changing based on commands send arduino. intention pid controller @ current position, , target , adjust speed of motor approaches target minimize overshoot.

i'm open solution, if has better idea other pid controller fix overshoot issue please let me know. of help.

you need tune pid loop - read it, there's lot of resources out there on topic.

Arduino Forum > Using Arduino > Motors, Mechanics, and Power (Moderator: fabioc84) > Controlling DC motor overshoot

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