Aim

• To interface an LM35 temperature sensor with an Arduino Uno to detect a specific temperature and use that signal to control a 12V DC motor and an LED through a 5V relay. The project also includes an LCD display to show the live temperature and device status.

Objective

• Understand the working principles of the LM35 temperature sensor.
• Learn to interface an Analog sensor with an Arduino Uno.
• Learn to control an LED using an NPN transistor.
• Learn to connect and control a high-power DC motor using a low-power Arduino via a relay.
• Program the Arduino to read sensor input and respond by controlling the DC motor and LED accordingly.