Digital Thermometer using arduino and temperature sensor( LM35 )

Materials:-

• Arduino uno = https://bit.ly/30v5XcY
• LM35 = https://bit.ly/3bUPLWK
• LCD display = http://bit.ly/37SLuRJ

Diagram:-

Connections:-

LCD display to arduino

• Vss = Arduino GND
• VDD = Arduino 5V
• V0 = Potentiometer center pin
• RS = Digital pin  2
• RW = Arduino GND
• E =   Digital pin 3
• D4 = Arduino digital pin  4
• D5  = Arduino digital pin 5
• D6 = Arduino digital pin 6
• D7 = Arduino digital pin 7
• A = Arduino  5V
• K = Arduino GND

Potentiometer to arduino

•   Left pin  = Arduino GND
•   Right pin = Arduino 5v
• center pin = Display VO 

temperature sensor(LM35) to arduino

• Sensor VCC = Arduino 3.5V
• Sensor GND = Arduino GND
• Sensor center = Arduino A0

Downloads:-

LCD display library(LiquidCrystal.h) = http://bit.ly/2VeF5xt
Code = https://bit.ly/3cUWQYN

Code:-

 #include <LiquidCrystal.h>

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

int tempin = A0; // the output pin of LM35

int temp;

int cel;

int tempmin = 30;  

int tempmax = 35;

int kel;

void setup() {

  pinMode(tempin, INPUT);

  Serial.begin(9600);

lcd.begin(16,2);

}

void loop() {

  temp = analogRead(tempin);

  cel = temp * 0.48828125;

  kel= cel+ 273.15;

  Serial.print(cel);

  Serial.println();

  lcd.print("celsius: ");

  lcd.print(cel); // display the temperature(celcius)

  lcd.print("C ");

  lcd.setCursor(0, 1);// move cursor to next line

  lcd.print("kelvin:  ");

  lcd.print(kel); // display the temperature(kelvin)

  lcd.print("k ");

  delay(200);

  lcd.clear();

}