Skills Dev I: LED BLINK

Intention

I want to get to know some basic logic of IoT programming through these three exercises.

Process

For the first and second one, I follow the logic of Loop to control the status of LED. For the third exercise, at first the second LED was not worked, I tried many times to adjust my code, finally, I found it was because the jumper wire put in the wrong place (front of the second LED)

Reflection

Now I just finish these three basic skill tests, I got to know how to use the loop logic and how to control two LED through the code. Maybe I will try to use multiple methods and add more sensors to control the blink of LED like the sound, the temperature, or some other interesting things.

Exercise 1:

Modify the program to Blink on and off every 3 seconds.

int ledPin1 = D2;
void setup(){
    pinMode(ledPin1,OUTPUT);
}

void loop(){
    digitalWrite(ledPin1,HIGH);
    delay(3000);
    
    digitalWrite(ledPin1,LOW);
    delay(3000);
}

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Exercise 2:

Change the program to blink on and off 5 times then stop for 3 seconds. Each blink should be 0.5s (a half second)

int ledPin1 = D2;
void setup(){
    pinMode(ledPin1,OUTPUT);
}

void loop(){
    for (int i = 0; i < 5; i++){
        
        digitalWrite(ledPin1,HIGH);
        delay(500);
    
        digitalWrite(ledPin1,LOW);
        delay(500);
    }
    delay(3000);
}

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Exercise 3:

Program the LED’s to alternate blinks i.e. when LED 1 turns on, LED 2 turns off, then when LED 2 turns on, LED 1 turns off.

int ledPin1 = D2;
int ledPin2 = D1;

void setup(){
    pinMode(ledPin1,OUTPUT);
    pinMode(ledPin2,OUTPUT);
    
}

void loop(){
    for (int i = 0; i < 5; i++){
        
        digitalWrite(ledPin1,HIGH);
        digitalWrite(ledPin2,LOW);
        delay(500);
    
        digitalWrite(ledPin2,HIGH);
        digitalWrite(ledPin1,LOW);
        delay(500);
    }
    digitalWrite(ledPin2,LOW);
    delay(3000);
}

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