An Arduino Uno acts as the main controller and receives temperature data from a DS18B20 digital temperature sensor. The sensor continuously measures the environment and sends the temperature digitally to the Arduino, which processes the data and displays the reading in degrees Celsius on the LCD. This project is useful for learning temperature sensing, digital sensor communication, and LCD interfacing, and can also be extended for applications such as room monitoring, electronic systems, and automation.

The Arduino Uno is the main controller of the project. It receives the digital temperature data from the DS18B20 sensor, processes the data, and sends the temperature value to the 16×2 LCD. The Arduino Uno is based on the ATmega328P microcontroller and provides digital and analog pins for connecting different electronic components.

The DS18B20 is a digital temperature sensor used to measure the surrounding temperature. Unlike analog sensors such as the LM35, it sends the measured temperature to the Arduino as digital data using the 1-Wire communication protocol. It can measure temperatures over a wide range and provides readings with good accuracy. The sensor normally has three connections: VCC, GND, and Data.

The 16×2 LCD is the output device used to display the measured temperature. The name 16×2 means that the display has 16 characters per row and 2 rows. In this project, the Arduino sends the temperature value to the LCD, where it can be viewed in real time. The LCD is operated in 4-bit mode, using the D4–D7 data pins to reduce the number of Arduino pins required.