Wireless Led Dot Matrix Notice Board - 2032 Words

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†¦show more content†¦The approximate time is 20ms so if the light is turned on at a frequency gt;50Hz (1/20ms) then your eye will not notice any flicker at all. Multiplexing uses this fact to reduce the number of pins needed to drive an LED display. You can do this by splitting the 32led displays into 7 rows and 5columns which lets you drive it using 7 row outputs and 5 column outputs. In fact the 5x7 led matrix block used here has all the leds arranged in this way already. Each row is driven in turn and as long as all of the rows are driven within a time period of 20ms it will appear as though the LEDs are on continuously. To turn a specific led ON , data is output to the column drivers when a row is driven. To save more pins it is common to use a helper chip and in this project it is a Johnson counter (a 4017). This generates a walking one every time that it s clocked. Since you only want one row on at a time it is the ideal chip for this application. In this project when the 4017 has been reset it outputs logic high at Q0 - which is not connected - so during reset the 4017 does nothing. This allows you to use the column driver port for something else if you want to when you are not driving the LEDs.To drive the 4017 all you need is two pins one for reset and one for clock. So to fully drive the 32 matrix led display you need only 4 4017. The most difficult thing about using the dot matrix LED display is defining the characters. Basically for ASCII charactersShow MoreRelatedWireless Led Display Board Using Gsm1784 Words   |  8 PagesWireless LED Display Board Using GSM Kamal parmar Kamal parmar, M-tech in embedded system, Ganpat university,Ahmedabad. kamal.parmar4@gmail.com Abstract— LEDs are a fantastic way to illuminate any kind of sign, be it lettering or panels.LED Dot-Matrix Displays are a common sight now a day on streets, malls, Buildings, parks and other public places. It is a way of visual information where large LCD and other display become too much expensive. 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