Incorporating multiple codes

Hello,

I am having trouble getting leds to light while i am reading temp and outputing that to a lcd screen. I can put temp to the lcd screen and shift out to all my leds but not both. here is the lcd temp code.

/*
* temperature_sensor.pde
 * -----------------
 * Takes the sensor (LM335) input and converts it
 * to Kelvin degrees, then celsius.
 * Subtract 2.5 celsius degrees that seem
 * to be the sensor error perhaps due to the heat
 * generating by the current running through it.
 * 2.5 degrees were calculated by using a mercury
 * thermometer next to the sensor.
 *
 * http://spacetinkerer.blogspot.com
 */
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(10, 11, 12, 13, 14, 15);
 
 
float temp_in_celsius = 0, temp_in_kelvin=0, temp_in_fahrenheit=0;
float raw;

void setup()
{
  Serial.begin(9600);
  lcd.begin(16, 2);
}

void loop()
{

  //Reads the input and converts it to Kelvin degrees
  temp_in_kelvin = analogRead(A3) * 0.004882812 * 100;
 
  //Converts Kelvin to Celsius minus 2.5 degrees error
  temp_in_celsius = temp_in_kelvin - 2.5 - 273.15;
 
  temp_in_fahrenheit = ((temp_in_kelvin - 2.5) * 9 / 5) - 459.67;
  if (temp_in_fahrenheit <= 70) {
    lcd.clear(); 
    lcd.print(temp_in_fahrenheit);
    lcd.print(" F ");
    lcd.print(temp_in_celsius);
    lcd.print(" C");
    lcd.setCursor(0, 1); // bottom left
    lcd.print("BRRR it's cold");
  delay(500);
  } 
  
    if (temp_in_fahrenheit >= 75) {
    lcd.clear(); 
    lcd.print(temp_in_fahrenheit);
    lcd.print(" F ");
    lcd.print(temp_in_celsius);
    lcd.print(" C");
    lcd.setCursor(0, 1); // bottom left
    lcd.print(" HOT HOT HOT");
  delay(500);
  } 
  
  
  
    if ((temp_in_fahrenheit > 70) && (temp_in_fahrenheit  < 75)) {
    lcd.clear(); 
    lcd.print(temp_in_fahrenheit);
    lcd.print(" F ");
    lcd.print(temp_in_celsius);
    lcd.print(" C");
    lcd.setCursor(0, 1); // bottom left
    lcd.print("Hello Alexander");
  delay(500);
  } 
}

And here is one of the led codes I want to work while at the >70 to <75 range

//**************************************************************//
//  Name    : shiftOutCode, Dual Binary Counters                 //
//  Author  : Carlyn Maw, Tom Igoe                               //
//  Date    : 25 Oct, 2006                                       //
//  Version : 1.0                                                //
//  Notes   : Code for using a 74HC595 Shift Register            //
//          : to count from 0 to 255                             //
//**************************************************************//

//Pin connected to ST_CP of 74HC595
int latchPin = 5;
//Pin connected to SH_CP of 74HC595
int clockPin = 4;
////Pin connected to DS of 74HC595
int dataPin = 3;



void setup() {
  //Start Serial for debuging purposes	
  Serial.begin(9600);
  //set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);

}

void loop() {
  //count up routine
  for (int j = 0; j < 256; j++) {
    //ground latchPin and hold low for as long as you are transmitting
    digitalWrite(latchPin, 0);
    //count up on GREEN LEDs
    shiftOut(dataPin, clockPin, j); 
    //count down on RED LEDs
    shiftOut(dataPin, clockPin, 255-j);
    //return the latch pin high to signal chip that it 
    //no longer needs to listen for information
    digitalWrite(latchPin, 1);
    delay(1000);
  }
}

void shiftOut(int myDataPin, int myClockPin, byte myDataOut) {
  // This shifts 8 bits out MSB first, 
  //on the rising edge of the clock,
  //clock idles low

//internal function setup
  int i=0;
  int pinState;
  pinMode(myClockPin, OUTPUT);
  pinMode(myDataPin, OUTPUT);

 //clear everything out just in case to
 //prepare shift register for bit shifting
  digitalWrite(myDataPin, 0);
  digitalWrite(myClockPin, 0);

  //for each bit in the byte myDataOut�
  //NOTICE THAT WE ARE COUNTING DOWN in our for loop
  //This means that %00000001 or "1" will go through such
  //that it will be pin Q0 that lights. 
  for (i=7; i>=0; i--)  {
    digitalWrite(myClockPin, 0);

    //if the value passed to myDataOut and a bitmask result 
    // true then... so if we are at i=6 and our value is
    // %11010100 it would the code compares it to %01000000 
    // and proceeds to set pinState to 1.
    if ( myDataOut & (1<<i) ) {
      pinState= 1;
    }
    else {	
      pinState= 0;
    }

    //Sets the pin to HIGH or LOW depending on pinState
    digitalWrite(myDataPin, pinState);
    //register shifts bits on upstroke of clock pin  
    digitalWrite(myClockPin, 1);
    //zero the data pin after shift to prevent bleed through
    digitalWrite(myDataPin, 0);
  }

  //stop shifting
  digitalWrite(myClockPin, 0);
}

So how do i combine the two?

You write a new program which does both. To do this you need to understand how the code for each of the other programs works. After that read

http://forum.arduino.cc/index.php?topic=223286.0

and

http://forum.arduino.cc/index.php?topic=261445.0

Mark