Systemy mechatroniczne Zal

#include "Keypad.h"
int i = 0;
int x = 0;
int val;
int tempPin = 0;
int t;
String temp = "";
String mb;
float z;

const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3' , 'A'},
  {'4', '5', '6' , 'B'},
  {'7', '8', '9' , 'C'},
  {'*', '0', '#' , 'D'}
};
byte rowPins[ROWS] = {13, 12, 6, 5};  //Piny, do których podłączamy wyprowadzenia od rzędów
byte colPins[COLS] = {4, 3, 2 , 1}; //Piny, do których kolumn wyprowadzenia od rzędów

Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

void setup()
{
  pinMode(7, OUTPUT);
  digitalWrite(7, HIGH);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  Serial.begin(9600);
}
void loop()
{
  char key = keypad.getKey();
  if (key != 0)
  {
    mb = key;
  }
  val = analogRead(tempPin);
  float mv = ( val / 1024.0) * 5000;
  float cel = mv / 10;
  float farh = (cel * 9) / 5 + 32;


  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);
  digitalWrite(11, LOW);

  Serial.println(mb);
  int t = (mb.toInt());


  if (t==1)
  {
    z=22.5;
  }
  if (t==2)
  {
     z=23;
  }
  if (t==3)
  {
     z=23.5;
  }
  if (t==4)
  {
     z=24;
  }
  if (t==5)
  {
     z=24.5;
  }
  if (t==6)
  {
     z=25;
  }
  if (t==7)
  {
    z=25.5;
  }
  if (t==8)
  {
     z=26;
  }
  if (t==9)
  {
     z=26.5;
  }

  if (cel < z) {

    for (; i < 50; i++) {
      delay(2);
      digitalWrite(11, HIGH);
      digitalWrite(10, LOW);
      digitalWrite(9, LOW);
      digitalWrite(8, LOW);
      delay(2);
      digitalWrite(11, LOW);
      digitalWrite(10, HIGH);
      digitalWrite(9, LOW);
      digitalWrite(8, LOW);
      delay(2);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(8, LOW);
      delay(2);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      digitalWrite(9, LOW);
      digitalWrite(8, HIGH);
    }
    i = 0;
     Serial.print(cel);
     Serial.print(" - aktualnie grzeje");
     Serial.println();
    Serial.print(z);
  Serial.print(" -zadana");
  Serial.println();
  }

  if (cel > z) {
    for (; i < 50; i++) {
      digitalWrite(8, HIGH);
      digitalWrite(9, LOW);
      digitalWrite(10, LOW);
      digitalWrite(11, LOW);
      delay(2);
      digitalWrite(8, LOW);
      digitalWrite(9, HIGH);
      digitalWrite(10, LOW);
      digitalWrite(11, LOW);
      delay(2);
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
      delay(2);
      digitalWrite(8, LOW);
      digitalWrite(9, LOW);
      digitalWrite(10, LOW);
      digitalWrite(11, HIGH);
      delay(2);
    }
    i = 0;
     Serial.print(cel);
     Serial.print(" - aktualnie chlodzi");
     Serial.println();
    Serial.print(z);
  Serial.print(" -zadana");
  Serial.println();
  }

}//loop