Difference between revisions of "Switch and a LED with AVR Breakout"
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Revision as of 11:22, 7 April 2016
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
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| #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; | |
| } |
Demo
Downloads