LED Matrix 8x8led

8/11/2019 LED Matrix 8x8led

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LED Matrix 8x8


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LED Matrix

A LED Matrix is an array of leds used to

generate characters, symbols and images Several single LED Matrices can be combined

to create a larger LED Matrix


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LED Matrix Types

Color type

1. MonoColor: Green or Red or Yellow

2. BiColor: Red and Green

3. RGB: Red, Green and Blue

Pole type1. Led Anode in the row

2. Led Anode in the column


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Inside an 8x8 LED Matrix

An 8x8 monocolor LEDMatrix includes 64LEDs arranged in 8rows and 8 columns

R0R1R2R3

R4R5R6R7

C0C1 C2 C3C4C5 C6C7

An 8x8 bicolor LED Matrix (RED,

GREEN) includes 64 pairs of red andgreen LEDs arranged in 8 rows and 8columns

COL

ROW

0 1 2 3 4 5 6 7

7

6

543

2

1

0


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The Chinese LED Matrix Part No.For example:

L M M - 1 5 8 8 X

15 means 1.5 inches for the size of the LED Matrix

88 means 8 columns and 8 rows

X : LED Matrix type

A : Anode in the Row (Cathode in the Column)

B : Anode in the Column (Cathode in the Row)


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How a MonoColor LED Matrixworks?

R0

R1

R2

R3

R4

R5

R6R7

C0 C1 C2 C3 C4 C5 C6 C7

8 pins R0-R7 to control rows and 8

pins C0-C7 to control columns.

For the Row-Anode LED Matrix:

5V to enable the row

0V to enable the column

For Column-Anode LED Matrix:

0V to enable the row

5V to enable the column


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The BiColor LED Matrix

(Red & Green)

There are: 8 pins to control the rows

16 pins to control the columns,including 8 pins for Red LEDs

8 pins for Green LEDs


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Turning on 1 LED on a Row-Anode LED Matrix

1. Enable row position pin and disable otherrow pins

2. Enable the column position pin and disableother column pins

Note: Because of using the NOT ports, set5V to enable one column

Example: To turn on the Row-Anode LED atRow R4, Column C6:

1. Set 5V to R4 (enabled) and other row pins to

0V (disabled)

2. Set 5V to C6 (enabled) and other columnpins to 0V (disabled)

COL0 1 2 3 4 5 6 7

ROW

76

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0V 0V 0V 0V 0V 0V 5V 0V

C0 C1 C2 C3 C4 C5 C6 C7

R0

R1

R2R3

R4

R5

R6R7

0V

0V

0V0V

5V

0V

0V0V


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Developing a Program to Turn On

one LED on the LED Matrix


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Connecting the Cables1. Connect B0-B7 to the

jumper row control 1-8

2. Connect C0-C7 to thejumper green control 1-8 (orthe jumper red control)

JUMPER GREEN

CONTROL

PORT B PORT C

JUMPER ROW

CONTROL

JUMPER RED

CONTROL


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Electronic Schema


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#include

#include "led_matrix_8x8_driver.c"

#use delay(clock = 4MHz, crystal)

void main() {

while (true)turn_on_pixel(4, 6);

}


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Controlling 1 Row on Anode-Row LED Matrix

1. Set an 8-bit data to the column pins

Note: Because of using the NOT ports, set5V to enable one column

2. Enable the chosen row and disable theother rows

Example: Display 01010101 on row R4

1. Set 01010101 to the column pins

2. Set 5V to R4 and 0V to others

COL

ROW

0 1 2 3 4 5 6 776

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R0

R1

R2

R3

R4

R5

R6R7

0V

0V

0V

0V

5V

0V

0V0V

C0 C1 C2 C3 C4 C5 C6 C75V 0V 5V 0V 5V 0V 5V 0V


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Developing a Program to

Control One Row on the LEDMatrix


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#include #include "led_matrix_8x8_driver.c"


void main() {byte pattern = 0b01010101 ;

int8 row_no = 4;while (true)

display_pattern_on_row(pattern, row_no );}


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Controlling 1 Column on an Anode-Row LED Matri

R0

R1

R2R3

R4

R5

R6R7

C0C1 C2 C3 C4 C5 C6 C7

5V

0V

5V0V

5V

0V

5V0V

0V0V 5V 0V 0V0V 0V 0V

COL

ROW

0 1 2 3 4 5 6 776

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1. Set an 8-bit data to the row pins

2. Enable the chosen column and

disable the other columns

Note: Because of using the NOTports, set 5V to enable onecolumn

Example: Display 01010101 oncolumn C2

Set 01010101 to the row

pins Set 5V to C2 and 0V to

others


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Control One Colunm on theLED Matrix


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Solution 1



void main() {

byte pattern = 0b01010101;int8 col_no = 2;while (true)

display_pattern_on_col (pattern, col_no);

}


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Solution 2



void main() {byte pattern = 0b10101010;byte col_2 = 0b00000100;while (true)

display_pattern_on_ bit_col (pattern, col_2 );}


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Displaying an 8x8 Pattern on an Anode-Row

LED Matrix

We use the columns for controlling and therows for displaying data

Display each column in turn and delay 100us

There is just 1 column lighting at a time.But due to the

Persistence of VisionPhenomenon, we can see the whole patternon the LED Matrix

COL

ROW

0 1 2 3 4 5 6 7

7

6

5

4

3

2

1

0


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Display an 8x8 Pattern on theLED Matrix


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Solution#include #include "led_matrix_8x8_driver.c"


// C 0 1 2 3 4 5 6 7

// R0 * * * * *

// R1 * * * *

// R2 * * * *

// R3 * * * * *

// R4 * * * * *

// R5 * * * *

// R6 * * * *

// R7 * * * * *

// FF FF 99 99 FF 66 00 00

void main() {int8 char_B[] =

{0xff, 0xff, 0x99, 0x99, 0xff, 0x66, 0x00, 0x00};while (true)

display_pattern(char_B);}


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Turn On a Pixel on a LED Matrix


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void turn_on_pixel(int8 row, int8 col)

void turn_on_pixel(int8 row, int8 col) {

output_b(shift_left_0x01(row));

output_c(shift_left_0x01(col));

}

int8 shift_left_0x01 (int8 n_times) {

return (0x01


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Display a Pattern on a Row of a

LED Matrix


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void display_pattern_on_row(int8 row_pattern,

int8 row_num)

void display_pattern_on_row(int8 row_pattern,int8 row_num) {

output_c(row_pattern);

output_b(shift_left_0x01(row_num));

}


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Display a Pattern on a Column of a

LED Matrix


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Solution 1


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void display_pattern_on_col(int8 col_pattern,

int8 col_num)

void display_pattern_on_col(int8 col_pattern, int8col_num) {

output_b(col_pattern);

output_c(shift_left_0x01(col_num));

}


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void display_pattern_on_bit_col(int8

col_pattern, int8 bit_col)

void display_pattern_on_bit_col(int8

col_pattern, int8 bit_col) {output_b(col_pattern);

output_c(bit_col);}


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Display an 8x8 Pattern on a LED

Matrix


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void display_col_patterns(int8 col_patterns[])

void display_col_patterns(int8 col_patterns[]) {

int8 col;

int8 bit_col = 0x01;for (col = 0; col < 8; col++) {

display_pattern_on_bit_col(col_patterns[col], bit_col);

delay_us(100);

turn_off_led_matrix();

bit_col

LED Matrix 8x8led

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