5X7 dot matrix led interfacing

[dagakshay]

 pic 1

[dagakshay]

 right side pic

wysiwyg_imageupload:769:

[dagakshay]

 code to display ‘A’:

 

#include<avr/io.h>

#include<util/delay.h>

 

int main (void)

{

DDRB=0xff; // set port B as o/p

DDRD=0xff; // set port D as i/p

 

while(1)

{

PORTB=~(0x01);

PORTD=0x04;  // to display first row

_delay_ms(1);

PORTB=~(0x02);

PORTD=0x0A;  // to display second row

_delay_ms(1);

PORTB=~(0x04);

PORTD=0x11;  // to display third row

_delay_ms(1);

PORTB=~(0x08);

PORTD=0x1F;  // to display fourth row

_delay_ms(1);

PORTB=~(0x10);

PORTD=0x11;  // to display fifth row

_delay_ms(1);

PORTB=~(0x20);

PORTD=0x11;  // to display sixth row

_delay_ms(1);

PORTB=~(0x40);

PORTD=0x11;  // to display seventh row

_delay_ms(1);

}

}

 

[dagakshay]

 result:

wysiwyg_imageupload:770:

[M.Fakhruzzaman.Al.Faisal]

wow greats its wonderfull and very inspire me…

 

thanks

[IMTISAL AKHTAR]

Really thankx ,,, i amfinding this since a long time ago…. thanks again

[Ahmed]

Hi dagakshay..

 

Atmega32 have only 4 ports like ATMEL C51 if i want to interface 6 7*5 dot matrix leds how can i provide external ports ????

I think you can interface just 3 dot matrix leds is that right or not ????

 

can we use another way to do this with one chip? and how ???

[dagakshay]

hello ahmed ,

nice concept… i think you can use it as you do in seven segment mutiplexing technique… i dint tried that yet but that idea must work… instead of connecting the cathod directly to microcontroller use ULN… and the common pint of ULN can be used as a multiplexing point… i will try that concept and paste the ckt here… till the tym you also try and let me know till where you have reached… once again apprecaite your idea.. all d bst i will back to you soon…

[Ahmed]

Hi dagakshay

 

Thank you very match nice teachnic. is this called shift the writing???

 

Thank you again

[dagakshay]

not exactlly shiftting it is basically multiplexing

[vishal]

sir how to shift the characters . so it likes a moving display

[D.V.G. Krishna]

 

nice work buddy

i,m working on similar project

im using just 8 leds to display my name”vamsi ece” actually it worked

watch the link

http://homemaderobo.blogspot.in/2012/03/propellerrotating-led-display.html

[Author]

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