Arduino LM35 based Temperature Meter with Celcius and Farnheight temperature output on Serial Terminal and 16x2 LCD

lm35_arduino_lcd.ino

/*
for compelete blog 
http://www.fypsolutions.com/arduino/lm35-temperature-sensor-arduino

*/



#include <LiquidCrystal.h>
// Pin Definitions
#define LCD_PIN_RS  7
#define LCD_PIN_E 6
#define LCD_PIN_DB4 2
#define LCD_PIN_DB5 3
#define LCD_PIN_DB6 4
#define LCD_PIN_DB7 5

#define LM35_PIN_VOUT A3

LiquidCrystal lcd(LCD_PIN_RS, LCD_PIN_E, LCD_PIN_DB4, LCD_PIN_DB5, LCD_PIN_DB6, LCD_PIN_DB7);



float getTempC(byte nSamples)
{
  int val = 0;
  for (byte i =0 ; i < nSamples ; i++ ){
    val += analogRead(LM35_PIN_VOUT);
    delay(1);
  } 
  return (5.0 * val * 100.0) / 1024.0 / nSamples;
}

float convertToF(float tempInC){
  return ((tempInC*1.8)+32); // Converting Celcius to Fahrenheit
}



void setup() {
  Serial.begin(9600);
  while (!Serial) ; // wait for serial port to connect. Needed for native USB
  Serial.println("start");

  // set up the LCD's number of columns and rows
  lcd.begin(16, 2);
lcd.setCursor(0,0);
  lcd.print(F("LM35 Reading"));
  
}

void loop() {
  float lm35TempC =  getTempC(10);
  float lm35TempF = convertToF(lm35TempC);
  Serial.print(F("Temp: ")); 
  Serial.print(lm35TempC); 
  Serial.print(F("C, "));
  Serial.print(lm35TempF);
  Serial.println(F("F, "));
  lcd.setCursor(2,1);
  lcd.print(lm35TempC);
  lcd.print(F("C, "));  
  lcd.print(lm35TempF);
  lcd.print("F" );
  delay(1000);
}