Room Temperature Display In LCD Monitor Using Arduino

Introduction

• LM35 is used for finding the temperature of a place.
• This sensor circuitry is sealed and therefore it is not subjected to oxidation and other processes.
• It also possess low self heating and does not cause more than 0.1 degree Celsius temperature rise in still air.

Figure 1: LM35

Parts of list

• Arduino
• LCD Display
• LM35 temperature sensor
• Potentiometer
• Breadboard
• Hookup wire.

Connection from sensor to board

• The first pin can be connected to the Vcc of the 5V to an Arduino board.
• The second pin can be connected to the A1 of analog side to an Arduino board.
• The third pin can be connected to the Gnd to an Arduino board.

Connection from LCD Display to Arduino

Figure 2: LCD Display

• Fix the LCD in the 16 to 2 in the bread board.
• The 16 pin to the Gnd
• The 15 pin to the Vcc
• The 14 pin to the Digital pin 02
• The 13 pin to the Digital pin 03
• The 12 pin to the Digital pin 04
• The 11 pin to the Digital pin 05
• The 01 pin to the Gnd.
• The 02 pin to the Vcc.
• The 03 pin to the potentiometer.
• The 04 pin to the Digital pin 07.
• The 05 pin to the Gnd.
• The 06 pin to the Digital pin 06.

Connection from Potentiometer to Arduino

Figure 3: Potentiometer

• Connect as per the preceding figure to the Arduino board and the LCD Display.
• The Vin connected to the LCD display in 03.

Programming

#include <LiquidCrystal.h>    
    
// initialize the library with the numbers of the interface pins    
LiquidCrystal lcd(2 ,3 ,4 ,5 ,6 ,7);    
    
//declare variables    
float tempC;    
float tempF;    
int tempPin = 1;    
    
void setup(){    
  // set up the LCD's number of columns and rows:    
  lcd.begin(16, 2);    
  lcd.print("Temp1=");    
  lcd.setCursor(0, 1);    
  lcd.print("Temp2=");    
}    
    
void loop(){    
  tempC = analogRead(tempPin);           //read the value from the sensor    
  tempC = (5.0 * tempC * 100.0)/1024.0;  //convert the analog data to temperature    
  tempF = ((tempC*9)/5) + 32;            //convert celcius to farenheit    
    
  // print result to lcd display    
  lcd.setCursor(6, 0);    
  lcd.print(tempC,1);    
  lcd.print("'C");    
    
  lcd.setCursor(6, 1);    
  lcd.print(tempF,1);    
  lcd.print("'F");    
    
  // sleep...    
  delay(1000);    
}

Explanation

• It shows the current room temperature in the location.
• It will display in the LCD monitor as the Celsius to Fahrenheit.
• The temperature can be display as the temp1, temp2 in the monitor.

Output

Figure 4: Output

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