The System is entitled as “IoT Based Temperature Checking System” is developed using LM35-temperature sensor in Arduino UNO. The main objective of this project is checking the temperature using LM 35 sensor. The system identifies the human body temperature in degree Celsius. It utilizes Arduino Uno board in conjunction with ATmega328 chip. Arduino provides an open-source and easy-to-use programming tool, for writing code and uploading it to your board. It is often referred to as the Arduino IDE (Integrated Development Environment). An LM35 temperature sensor is used to detect the heat. When the system detects the temperature at high level of degree Celsius, it makes warning alarm