CoffeeRoaster-1

#include <PID_v1.h>

#define PIN_INPUT 0
#define PIN_OUTPUT 3


double Setpoint, Input, Output;   //Define Variables of the PID
double Kp=5, Ki=5, Kd=1;          //Specify the links and initial tuning parameters
PID myPID(&Input, &Output, &Setpoint, Kp, Ki, Kd, DIRECT);

char rx_byte = 0;
String rx_str = "";
boolean not_number = false;
int result;

int x; 


void setup() {
  Serial.begin(9600);
  Serial.println("Set the temperature of the Roaster");
    // x= result;
   // Input = analogRead(PIN_INPUT);    //initialize the variables we're linked to
   // Setpoint =x ;
   // myPID.SetMode(AUTOMATIC);         //turn the PID on
}

  
void loop() {
  if (Serial.available() > 0) {    // is a character available?
    rx_byte = Serial.read();       // get the character
    
    if ((rx_byte >= '0') && (rx_byte <= '9')) {
      rx_str += rx_byte;
    }
    else if (rx_byte == '\n') {   // end of string
      if (not_number) {
        Serial.println("Not a number");
      }
      else {
        
        result = rx_str.toInt();      // print the result 
        Serial.print(" SetTemp = ");  // Serial.print(rx_str);
        Serial.print(result);
        Serial.println("C");      //Serial.println("Set the temperature of the Roaster");
      }
      not_number = false;         // reset flag
      rx_str = "";                // clear the string for reuse
    }
    else {                    // non-number character received
      not_number = true;      // flag a non-number
    }
  } // end: if (Serial.available() > 0)
   x= result;
    Input = analogRead(PIN_INPUT);    //initialize the variables we're linked to
    Setpoint =x ;
    myPID.SetMode(AUTOMATIC);         //turn the PID on
    Input = analogRead(PIN_INPUT);
  myPID.Compute();
  analogWrite(PIN_OUTPUT, Output);
  Serial.print ("Set Temp:");
  Serial.println (result);
  Serial.print ("Mesured Temperature:");
  Serial.print (Input);
  Serial.print ("Real Temperature:");
  Serial.println (Output);
  delay (1000);
}