nao funcionando projeto gang

#include <LiquidCrystal.h>

int val;
int tempPin = 15;
int lcd_key = 0;
int adc_key_in = 0;

#define btnRIGHT  0
#define btnUP     1
#define btnDOWN   2
#define btnLEFT   3
#define btnSELECT 4
#define btnNONE   5

LiquidCrystal lcd(8, 9, 4, 5, 6, 7);

int read_LCD_buttons(){               // read the buttons
    adc_key_in = analogRead(0);       // read the value from the sensor

    // my buttons when read are centered at these valies: 0, 144, 329, 504, 741
    // we add approx 50 to those values and check to see if we are close
    // We make this the 1st option for speed reasons since it will be the most likely result

    if (adc_key_in > 1000) return btnNONE;

    // For V1.1 us this threshold
    if (adc_key_in < 50)   return btnRIGHT;
    if (adc_key_in < 250)  return btnUP;
    if (adc_key_in < 450)  return btnDOWN;
    if (adc_key_in < 650)  return btnLEFT;
    if (adc_key_in < 850)  return btnSELECT;

   // For V1.0 comment the other threshold and use the one below:
   /*
     if (adc_key_in < 50)   return btnRIGHT;
     if (adc_key_in < 195)  return btnUP;
     if (adc_key_in < 380)  return btnDOWN;
     if (adc_key_in < 555)  return btnLEFT;
     if (adc_key_in < 790)  return btnSELECT;
   */

    return btnNONE;                // when all others fail, return this.
}

void setup() {
  lcd.begin(16, 2);
  Serial.begin(9600);
}
void loop()
{
  lcd.setCursor(0,0);
  val = analogRead(tempPin);
  float cel = val * 0.48828125;
  float farh = (cel*9)/5 + 32;

  lcd.print("gang = ");
  lcd.print(cel);
  lcd.print("oC");
  Serial.print(cel);
  delay(300);

  if(cel>0){
    analogWrite(13, 255);
    digitalWrite(22, 1);
    digitalWrite(23, 0);
  }

  else{
    analogWrite(13, 0);
    digitalWrite(22, 1);
    digitalWrite(23, 1);
  }

   lcd.setCursor(0,1);             // move to the begining of the second line
   lcd_key = read_LCD_buttons();   // read the buttons

   switch (lcd_key){               // depending on which button was pushed, we perform an action

       case btnRIGHT:{             //  push button "RIGHT" and show the word on the screen
            lcd.print("RIGHT ");
            break;
       }
       case btnLEFT:{
             lcd.print("LEFT   "); //  push button "LEFT" and show the word on the screen
             break;
       }
       case btnUP:{
             lcd.print("UP    ");  //  push button "UP" and show the word on the screen
             break;
       }
       case btnDOWN:{
             lcd.print("DOWN  ");  //  push button "DOWN" and show the word on the screen
             break;
       }
       case btnSELECT:{
             lcd.print("SELECT");  //  push button "SELECT" and show the word on the screen
             break;
       }
       case btnNONE:{
             lcd.print("NONE  ");  //  No action  will show "None" on the screen
             break;
       }
   }
}