Helpful in your major project

1. MOVING MESSAGE DISPLAY
ON LCD
MADE BY -
PRATYUSH (1110434100)
PRASHANT SRIVASTAVA (1110434099)
MOHAMMAD ASIF (1110434079)

2. Objective of Mini Project
Extension.
Circuit Diagram
Theory
Software
List of Parts
PCB Layout
Applications
CONTENTS

3. To interface an LCD with AVR microcontroller and
display the moving message on to the LCD with help of
AVR Studio and winAVR software
OBJECTIVE

4.  PCB layout will be constructed as a major project in
forthcoming Even Semester (Eighth semester)
 Hardware and Software both are essential parts of
this project
 Software realization is to be done as mini project and
hardware realization is to be done as major project
EXTENSION

5. CIRCUIT DIAGRAM

6. Fig. 1 shows the circuit for AVR ATmega16-based
moving-message display on an LCD.
To derive the power supply for the circuit, 230V AC
mains is stepped down by a 9V, 250mA secondary
transformer, rectified by bridge rectifier module BR1A
and filtered by capacitor C1.
The voltage is regulated by a 7805 regulator.
THEORY

7. LED1 glows to indicate the presence of power in the
circuit.
The regulated 5V DC powers the entire circuit including
SPI6 connector.
Port-C pins PC4 through PC7 of the microcontroller
(IC2) are connected to data lines D4 through D7 of the
LCD. The LCD control lines—read/write (R/W),
register-select (RS) and enable (E)—are connected to
PD6, PC2 and PC3 of IC2, respectively.
THEORY(CONTD.)

8. This project demonstrates sending the text to the LCD
controller and scrolling it across the LCD.
 AVR Studio 4 and WINAVR software need to be
installed in your PC.
Three program codes are used here—movm.c, lcd2.c
and lcd2.h.
The movm.c contains the text message to be scrolled on
the LCD.
The programming technique given here may not be the
best as it uses a simple logic, but it works pretty fine.
SOFTWARE

9. LIST OF PARTS
Semiconductors
•IC1 -7805, 5V
regulator
•IC2-Atmega 16
AVR
microcontroller
•LCD1- 16x2 LCD
display module
•BR1A-1 amp
bridge rectifier
module
•LED1-5mm light
emitting diode
Capacitors
•C1-100µF,25V
electrolytic
•C2-0.1µF, ceramic
•C3,c4-
22pF,ceramic
•C5-10µF,16V
electrolytic
Resistors
•R1-470 ohm
•R2-10 kilo ohm
•R3-47 ohm
•VR1-10 kilo ohm
preset
Miscellaneous
•S1-Tactile
switch
•X-16 MHz
crystal
•SPI6-6 pin
bergship male
connector
•X1-230V ,AC
primary to 9V
250mA,
Secondary
transformer

10. PCB LAYOUT

11.  Advertisement Boards
 Airports
 Auctions outlets
 Cinemas theaters
 Buses
 Hotels & Restaurants
 Petrol Stations
 Railway Stations
 Bulletins
APPLICATIONS

12.  www.electronicsforu.com
 http://honeyteq.in/digital-display.aspx
 http://www.howstuffworks.com/
 http://en.wikipedia.org
 M. Morris Mano, “Digital logic design”,
PHI
REFERENCES

13. THANKS