Switch and a LED with AVR Breakout

Now we will control the LED depending on external input. In this tutorial we will interface a switch to one of the port pin and display its status on LED connected to other port.

Basics

For this tutorial we will a connect a switch to PORT C0 and LED to PORT B0 of Atmega32. W will configure PORT A0 as input to read the switch status and PORT C0 as outputto display the switch status on LED. Initially LED will be ON , when we press switch the LED will be OFF.
Refer the AVR I/O Register Configuration tutorial for basics of GPIO register configuration.

Hook Up

Code

	#include <avr/io.h>
	#define LED 0
	#define SWITCH 0
	int main(void)
	{
	DDRB |= (1<<LED); // Configure PORTB as output to connect Led
	DDRC &= ~(1<<SWITCH); // Configure PORTC as input to connect switch
	PORTC |= 0x01; // Enable The PullUps of PORTC.
	while(1)
	{
	if(!PINC)
	PORTB &= ~(1<<LED);
	else
	PORTB |= (1<<LED);
	}
	return 0;
	}

view raw switch_led_avr.c hosted with ❤ by GitHub

Demo

Downloads

Download the complete project folder from the below link: https://github.com/ExploreEmbedded/AVR-MCU-Breakout-Board/archive/master.zip

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