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int led1Pin = D2;
int led2Pin = D10;

void setup() {
    pinMode(led1Pin, OUTPUT);
    pinMode(led2Pin, OUTPUT);
    
}

void loop() {
        digitalWrite(led1Pin, LOW);
        digitalWrite(led2Pin, HIGH);
        delay(500);
        digitalWrite(led1Pin, LOW);
        digitalWrite(led2Pin, HIGH);
        delay(500);
        
}
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