Interfacing Seven Segment Display with Starter AVR

Now we will go further and will interface more complex peripherals. In this tutorial we will interface common anode 7 segment display to the starter AVR board. To get idea about basics of 7 segment display check out our Interfacing Seven Segment Displays with AVR tutorial.

Basic

In this example we are using common anode type of 7 segment display. To give positive voltage to the common anode I am using BC547, N-Type transistor as a driver and PD0 is used to drive this driver. PD0 is connected to the base of transistor through 68 Ohm resistor and VCC is given to collector through 1K resistor. Emitter of transistor is given to common pin of 7 segment display. Data lines of display is connected to PORTB. Do the connection as shown in hookup and flash the code.

Hookup

Code

	#include <avr/io.h>
	#include <util/delay.h>
	#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 < 0x10; cnt++) // loop to display 0-F
	{
	PORTD = Segment;
	PORTB = seg_code[cnt];
	_delay_ms(300);
	}
	}
	}

view raw 7Segment.c hosted with ❤ by GitHub

Demo

Downloads

Download the complete project folder from the below link: https://github.com/ExploreEmbedded/ATmega32_ExploreStarterAvr/archive/master.zip

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