This isn’t about connecting a temperature sensor in your Arduino. ... The temp sensor 3 pin devices are simple and cheap but good for 0.5 deg C precision or nearly a full degree in human measure.

Arduino Sketch //Room Temperature Monitor //T.K.Hareendran #include <LiquidCrystal.h> // Include the library to use a LCD display #define tempSensor 0 // Define the A0 pin as “sensor” int Vin; // ...

The LM35 temperature sensor and red led are powered with 5V from the Arduino board. As you can see in the sketch on the first line I included the LiquidCrystal library (header) that includes useful ...