A project which is based LED dot matrix display, which has scrolling effect to show all the texts issued to displayed.

1. LED DOT MATRIX MOVING TEXT DISPLAY IN
ATMEGA32
(By: Habitamu A.)

2. Introduction
•Moving texts are usual for displaying information
• Via small size place we can display many information
• Like 8x8 DOTMATRIX LEDs
•Those are done by the help of microcontrollers
• Allows us to load programs and implement the code as it
instructs
•We can do this by using ATMEGA32 microcontroller
• Addition to ATMEGA32 other electronics equipment's are used
• 8x8 DOTMATRIX LEDs
• MAX7219
• LCD

3. Devices

4. Circuit diagram

5. System flow chart
•User starting system
•User type character to the virtual
terminal
• If user types “ ~ ” symbol
• LED DOTMATRIX displays default
message
• Else if the user types other character
• The typed character will slide
•The LCD displays the typed
character

6. Letter formulation
• From 8x8 matrix LEDs we use
only 8x5 LEDs to display a
single character.
• Example to display “H” we use
the following binary numbers.
And see what dot matrix looks
like
0b01111111,
0b00001000,
0b00001000,
0b00001000,
0b01111111

7. SPI IN ATMEGA32
MISO
MOSI
SCK
OUT1
OUT2
MISO
MOSI
SCK
SS
Master Slave
MISO
MOSI
SCK
SS
Slave