File content as of revision 2:6acc2f4efd39:

#include "mbed.h"
#include "TextLCD.h"

void settemp();
void tempmenu();
float getTemp();
AnalogIn temp_sen(A0);
TextLCD lcd(PTC7,PTC0,PTC3,PTC4,PTC5,PTC6);
InterruptIn button(D0);
DigitalIn push2(D1);
DigitalIn push1(D2);
DigitalIn push3(D3);
PwmOut mypwm(A5);
//DigitalOut myled(A);

int temp = 25;
//float tempC, tempF, tempSamp[10];

int main() { 
  tempmenu();
}
        
void settemp(){
  lcd.cls();
  lcd.printf("enter temp:  %d",temp);
  wait(0.2);
  while(1){
    
    // temp up
    if(push2 == 0){
      temp++;
      lcd.printf("enter temp:  %d",temp);
    }
    
    // temp down
    if(push1 == 0){
      temp--;
      lcd.printf("enter temp:  %d",temp);
    }
    
    // confirm
    if(push3 == 0){
      break;
    }
    lcd.cls();
    wait(0.2);
  }
}

void tempmenu() {
  
  // interrupt
  button.fall(&settemp);
  while(1) {
    lcd.cls();
    mypwm.period_ms(10);
    // display menu
    lcd.printf("T:%.2f \n", getTemp());
    lcd.printf("1 to mod temp");
    wait(0.2);
    if(getTemp() < temp){
      // if current temp is below temp set
      wait(0.5);
      mypwm.pulsewidth_ms(8);
    } else {
      mypwm.pulsewidth_ms(2);
    }
  }
}

float getTemp() {
  
  float avg = 0.0;
  float tempC, tempF, tempSamp[10];
  int i;
  
  // read temp from sensor
  for(i = 0; i < 10; i++) {
    tempSamp[i] = temp_sen.read();
    wait(.05);
  }
  
  // calc average temp
  for(i = 0; i < 10; i++){
    avg = avg + (tempSamp[i] / 10);
  }

  // calc result
  tempC = (avg * 3.685503686 * 100);
  tempF = (9.0 * tempC) / 5.0 + 32.0;
  return tempC;
}