PC to microcontroller Communication through USART

Abstract

This project is developed for the users to control Electric and Electronic devices through Computer. The user can control all the domestic appliances for example, Light, TV, Fan, Fridge etc. When the user presses a specific button of the computer, a digital signal is generated and sent through a particular pin of the Serial port through USART. The microcontroller receives the signal and controls the controlling unit. The controlling unit drives a corresponding relay in the external electronic circuit. The relay is used as a switch to operate the particular device. By this way the user can control any of the Electric or Electronic devices. The user can also set the time duration for the particular device to on and off. The design and port programs are written in Visual Basic. The microcontroller program is written in assembly language. The Computer controlled Electric and Electronic devices can be used in areas where human cannot enter. It is also used in areas where the devices are to be controlled in a secured manner. In those areas, a computer is enough to control the entire operation of the electric and electronic devices.

Existing System

Proposed System

Architecture

BLOCK DIAGRAM