/*
 PID Basic Example
 Reading analog input A1 to control analog PWM output 3
*/
#include <PID_v1.h>
const byte PIN_INPUT = A1;
const byte PIN_OUTPUT = 3;
//Define Variables we'll be connecting to
double Setpoint, Input, Output;
// parameters
double Kp=2, Ki=5, Kd=1;
PID myPID(Input, Output, Setpoint, Kp, Ki, Kd);

void setup()
{
  //initialize the variables we're linked to
  Input = analogRead(PIN_INPUT);
  Setpoint = 100;
  //turn the PID on
  myPID.SetMode(AUTOMATIC);
}

void loop()
{
  Input = analogRead(PIN_INPUT);
  myPID.Compute();
  analogWrite(PIN_OUTPUT, Output);
}