Interfacing Seven Segment Display with AVR Breakout Revision as of 11:46, 4 April 2016 by Nitish (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

After blinking the LED , Let's display user information like numeric value using seven segment display. In this tutorial we will interface a seven segment display to AVR breakout board and display a single digit hex (0-F).

Basics

For this tutorial we are using common anode seven segment display. To drive this display we require a BC 547 transistor. The PORT B is connected to data lines of the display and PORT D0 is connacted to base of the transistor through 1k ohm resistor and collector is connected to VCC through 68 ohm resistor as shown in hook up.
check out Interfacing Seven Segment Displays with AVR tutorial for basics of seven segment display.

Hook Up

Code

	#define Segment 0x01
	int main() {
	char seg_code[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
	int cnt;
	/* Configure the ports as output */
	DDRB = 0xff; // Data lines
	DDRD = 0x01; // Control signal PORTD0
	while (1)
	{
	for (cnt = 0x00; cnt < 0x0f; cnt++) // loop to display 0-F
	{
	PORTD = Segment;
	PORTB = seg_code[cnt];
	_delay_ms(1000);
	}
	}
	}

view raw display.c hosted with ❤ by GitHub

Demo