I have got a simple 4 digit LED display routine. This is simulated using Proteus simulator. So in the picture you see simplified version of circuit. In real world you might need to strobe digits using transistor keys. Control program is written using WinAVR tool chain.

Bellow is a complete C file

//—————————————————-

#include

#include

#include

#include

#include

#include

uint8_t numbers[]={

0b11000000,//0

0b11111001,//1

0b10100100,//2

0b10110000,//3

0b10011001,//4

0b10010010,//5

0b10000010,//6

0b11111000,//7

0b10000000,//8

0b10010000,//9

0b01111111//.

};

uint8_t i;

void initAmega8()

{

PORTD=0xFF; //Port D all to “1″ - LEDS OFF

DDRD=0xFF; //Port D all to output

//Port B control lines to “1″ - Transistors OFF

PORTB &=~((1<<<<

//Port B control lines as output

DDRB |=((1<<<<

}

void sendNumber(uint8_t digit, uint8_t position)

{

//0…9 for digit; 1..4 for position

PORTD=numbers[digit];

PORTB|=_BV(position-1);

_delay_us(100);

PORTB&=~_BV(position-1);

_delay_us(100);

}

int main(void)

{

initAmega8();

while(1)

{

sendNumber(2,1);//LCD display shows “2006″

sendNumber(0,2);

sendNumber(0,3);

sendNumber(6,4);

}

return 0;

}

//—————————————————-

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This entry was posted on Tuesday, May 30th, 2006 at 8:09 pm and is filed under AVR Microcontrollers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.