Wireless Led Dot Matrix Notice Board
INTRODUCTION
This project implements the concept of wireless technology and LED scrolling display to construct an energy efficient and versatile electronic notice board for institutional purpose. The system uses dot matrix LED panels to construct a horizontal display module in which any kind of messages can be displayed and scrolled. The message to be displayed can be send wirelessly from a remote computer with the help of wireless RF transmitter and receiver. This system is also equipped with the RFID technology for institutional applications in which any student can be logged in using his unique ID to view his academic status like percentage of attendance, exam results sectional marks etc. for this application an RFID reader is included in this display board. For effectively implementing this RFID based display board each and every student should have their own unique electronic ID card.
FUNCTIONAL BLOCK DIAGRAM
DISPLAY BOARD SECTION
LED DOT MATRIX ARRAY
PIC 16F877A
CONTROLLER
POWER
4017 ARRAY
RF
RECEIVER
RFID
READER
TRNSMITTER SECTION
POWER
Transmitter
434 MHz
RS232 – TTL Converter
FUNCTIONAL DESCRIPTION
POWER SUPPLY
Power supply section power the whole circuitry. Different section of this system requires different voltage levels. This requirement cannot be achieved using a single power adapter or battery. So a power supply consist of dc-dc converter is used in our project. The DC-DC converted dc power supply can provide 12v dc, 9v dc and 5 v dc simultaneously for display, discrete IC and micro controller respectively. The power supply section is also included with short circuit protection to prevent system being damaged due to the careless usage or electrical malfunctions.
CONTROLLER
The controller used here is PIC 16f877a, which is an 8 bit micro controller used for general purpose medium scale applications. In our project this device retrieves signals from the RF receiver as serial data through its
This project implements the concept of wireless technology and LED scrolling display to construct an energy efficient and versatile electronic notice board for institutional purpose. The system uses dot matrix LED panels to construct a horizontal display module in which any kind of messages can be displayed and scrolled. The message to be displayed can be send wirelessly from a remote computer with the help of wireless RF transmitter and receiver. This system is also equipped with the RFID technology for institutional applications in which any student can be logged in using his unique ID to view his academic status like percentage of attendance, exam results sectional marks etc. for this application an RFID reader is included in this display board. For effectively implementing this RFID based display board each and every student should have their own unique electronic ID card.
FUNCTIONAL BLOCK DIAGRAM
DISPLAY BOARD SECTION
LED DOT MATRIX ARRAY
PIC 16F877A
CONTROLLER
POWER
4017 ARRAY
RF
RECEIVER
RFID
READER
TRNSMITTER SECTION
POWER
Transmitter
434 MHz
RS232 – TTL Converter
FUNCTIONAL DESCRIPTION
POWER SUPPLY
Power supply section power the whole circuitry. Different section of this system requires different voltage levels. This requirement cannot be achieved using a single power adapter or battery. So a power supply consist of dc-dc converter is used in our project. The DC-DC converted dc power supply can provide 12v dc, 9v dc and 5 v dc simultaneously for display, discrete IC and micro controller respectively. The power supply section is also included with short circuit protection to prevent system being damaged due to the careless usage or electrical malfunctions.
CONTROLLER
The controller used here is PIC 16f877a, which is an 8 bit micro controller used for general purpose medium scale applications. In our project this device retrieves signals from the RF receiver as serial data through its