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//Exercise 1
//Modify the program to Blink on and off every 3 seconds

int led1 = D2;

void setup() {
    // Configure the pins to be outputs
    pinMode(led1, OUTPUT);
   
}


void loop() {
    
    digitalWrite(led1, HIGH);
    delay(3000);
    
    digitalWrite(led1, LOW);
    delay(3000);
    
}
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