/*
sketch belongs to this video: https://youtu.be/crw0Hcc67RY
write by Moz for YouTube changel logMaker360
4-12-2017
*/

#include <PID_v2.h>

double Setpoint ; // will be the desired value
double Input; // photo sensor
double Output ; //LED
//PID parameters
double Kp=4.0, Ki=0.5, Kd=0.5; 
 
//create PID instance 
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);
 
void setup()
{
  
  Serial.begin(115000);   
  //Hardcode the brigdness value
  Setpoint = 100;
  //Turn the PID on
  myPID.SetMode(AUTOMATIC);
  //Adjust PID values
  myPID.SetTunings(Kp, Ki, Kd);
}
 
void loop()
{
  //Read the value from the light sensor. Analog input : 0 to 1024.
  // We map is to a value from 0 to 255 as it's used for our PWM function.
  
  Input = map(analogRead(12), 0, 1024, 0, 255);  // photo senor is set on analog pin 5
  //PID calculation
  myPID.Compute();
  //Write the output as calculated by the PID function
  analogWrite(19,Output); //LED is set to digital 3 this is a pwm pin. 
  //Send data by serial for plotting 
  Serial.print(Input);
  Serial.print(" ");
  Serial.println(Output);
  Serial.print(" ");  
  Serial.println(Setpoint);
//  delay(3000); 
}