ATmega32 LED blinking Experiment

The first and simplest project for any microcontroller is LED Blinking.

Circuit Diagram

Components Required

• ATmega32 microcontroller
• Programmer Board
• LEDs
• Crystal - less than 16 MHz.
• Capacitors - 2 
• +5 V supply
• Breadboard
• Connecting Wires

Optional

• Resistors - 330 Ohms to be connected in series with the LEDs(not shown in the circuit diagram) 

Description

• Here, all pins of PORT B are declared as output ports as all the LEDs are connected to the pins of PORTB.
• A crystal is connected to the XTAL1 and XTAL2 pins to provide the clock pulse.
• Reset is connected to +5V.

Source Code

#include <avr/io.h> 

#include <util/delay.h> 

#define F_CPU 1000000UL    // Defines the frequency of external crystal

    

int main()

 { 

          /* The Data direction register of all Pins of Port B is Set as Output*/

         DDRB = 0xFF;                

PORTB = 0x00;               // Initially all pins of Port B are set as Output Low

   while (1)                               // Infinite Loop

   {

  PORTB = 0b11111110;   // all LEDs will glow except the first LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b11111101;   // all LEDs will glow except the second LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b11111011;   // all LEDs will glow except the third LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b11110111;   // all LEDs will glow except the fourth LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b11101111;   // all LEDs will glow except the fifth LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b11011111;   // all LEDs will glow except the sixth LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b10111111;   // all LEDs will glow except the seventh LED 

  _delay_ms(500);            // delay of 500 milliseconds 

  PORTB = 0b01111111;   // all LEDs will glow except the eight LED 

  _delay_ms(500);            // delay of 500 milliseconds 

   }

   return 0;

 }

Thankyou for Reading