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
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 work sprety 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
