LCD Temperature Sensor

This simple circuit uses the arduino uno to get a temperature reading and then print that reading to the LCD screen. It also has a "desired temp" that you can change and then depending on if the acual temperature is warmer or colder it will activate one of two lights accordingly.

• Arduino uno circuit board
• bread board
• 25 jumper wires (sizes vary)
• 1 LCD screen
• 2 potentiometers
• 1 temperature sensor
• 3 10K resisters
• 2 LED lights (2 different colors)

#include LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

int pinTemp=A0;

void setup() {

pinMode(10,OUTPUT);

pinMode(9,OUTPUT); //sets the pins to be in/out put

pinMode(A1,INPUT);

pinMode(A0,INPUT);

lcd.begin(16, 2);

Serial.begin(9600);

}

void loop() {

float temp = analogRead(pinTemp);

float dTemp = analogRead(A1);

int pinTemp=A0;

dTemp=dTemp*0.1;

temp=temp*0.48828125;

temp=temp*(9/5)+32; //sets up the temp sensor

Serial.print("Current - ");

Serial.print(temp);

Serial.println("C"); //prints the temp stuff to the computer

lcd.setCursor(0, 0);

lcd.print("Current - ");

lcd.print(temp);

delay(1000);

lcd.setCursor(0,1);

lcd.print("Desired - "); //prints the temp stuff to the LCD screen

lcd.print(dTemp);

Serial.print(dTemp);

if (dTemp>temp){

digitalWrite(10,HIGH);

digitalWrite(9,LOW); //if dTemp is > temp turn on a light

} else {

digitalWrite(9,HIGH);

digitalWrite(10,LOW); //if dTemp is < temp turn on a light

}

}