Atmega16 and a 7 segment display

In this example we will show you how to connect a 7 segment display to our Atmega16. You can think of a 7 segment display as 7 individual LEDs in a configuration like the picture below.

Image 1 shows the layout and image 2 shows how the segments are arranged

7 seg Blank

So by lighting certain segments you can display numbers, so for example to display the number 1 you would light segments B and C. Here are more examples

7 segment

In this example we connect a HDSP-C3Y3 common anode display to our ATmega16, you can see the connections in the schematic below. We basically connect up segment A to PD0, segment B to PD1 and so on.

Schematic

atmega16 and 7segment

Code

The code was written in mikroC pro for AVR

[codesyntax lang=”c”]

int main(void)
{
DDRD = 0xFF; // Configure port D as output
while(1)
{

/*

1 1 1 1 1 1 1 1
DP G F E D C B A

*/

PORTD = 0xC0; // Display Number 0
delay_ms(1000); // Wait for 1s
PORTD = 0xF9; // Display Number 1
delay_ms(1000); // Wait for 1s
PORTD = 0xA4; // Display Number 2
delay_ms(1000); // Wait for 1s
PORTD = 0xB0; // Display Number 3
delay_ms(1000); // Wait for 1s
PORTD = 0x99; // Display Letter 4
delay_ms(1000); // Wait for 1s
PORTD = 0x92; // Display Letter 5
delay_ms(1000); // Wait for 1s
PORTD = 0x82; // Display Letter 6
delay_ms(1000); // Wait for 1s
PORTD = 0xF8; // Display Letter 7
delay_ms(1000); // Wait for 1s
PORTD = 0x80; // Display Letter 8
delay_ms(1000); // Wait for 1s
PORTD = 0x90; // Display Letter 9
delay_ms(1000); // Wait for 1s
}
}

[/codesyntax]

Links

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