I am doing a prototype using ATmega8L-8PU to detect temperature and control a relay and buzz. But the schematic seems not work, therefore I do a simple test to verify the AVR's pins are working perfectly or not.

I using the example sketch - Blink to control Digital-13 to let LED blink. It is work. Then I do a second sketch to test all pins (Due to leak of LED, I test first 8 pins.) it is fail.

Second Sketch quite simple and strick forward. Blink D0-D7 LED one by one.

I am doing a prototype using ATmega8L-8PU to detect temperature and control a relay and buzzer, but the schematic seems not work, therefore I do a simple test to verify the AVR's pins are working perfectly or not.

I using the example sketch - Blink to control Digital-13 to let LED blink. It is work.

Then I do a second sketch to test all pins (Due to leak of LED, I test first 8 pins.) It failed. Second Sketch is quite simple and strict forward: blink D0-D7 LED one by one.

char i, j, pcnt = 1;

char startDigitalPin = 0;
char maxDigitalPin = 7;

void setup()
{
    digitalWrite(13, HIGH);
    delay(100);
    digitalWrite(13, LOW);
    delay(100);

    digitalWrite(13, HIGH);
    delay(100);
    digitalWrite(13, LOW);
    delay(100);

    digitalWrite(13, HIGH);
    delay(100);
    digitalWrite(13, LOW);
    delay(100);

    // put your setup code here, to run once:
    for(i=startDigitalPin; i<=maxDigitalPin; i++) {
        pinMode(i, OUTPUT);
        digitalWrite(i, LOW);
    }
}

void loop()
{
    // put your main code here, to run repeatedly:
    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);

    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);

    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);

    for(i=startDigitalPin; i<=maxDigitalPin; i++) {
        for(j=i; j<=maxDigitalPin; j++) {
            digitalWrite(j, HIGH);
            delay(100 * pcnt);
            digitalWrite(j, LOW);
            delay(100 * pcnt);
        }

        digitalWrite(i, HIGH);
        delay(200 * pcnt);
    }

    pcnt++;

    if(pcnt > 10) {
        pcnt = 1;
        delay(8000);
    }
}