arduino nano32 sample code

#define RED_PIN 25
#define GREEN_PIN 26
#define BLUE_PIN 27

void setup()
{
    Serial.begin(115200);
    pinMode(RED_PIN, OUTPUT);
    pinMode(GREEN_PIN, OUTPUT);
    pinMode(BLUE_PIN, OUTPUT);
    int zahl = analogRead(A0);
    Serial.println("Hallo Welt");
    Serial.println(zahl);
}

void loop()
{
    // Setze die RGB-LED auf Rot
    analogWrite(RED_PIN, 255);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
    delay(1000);

    // Setze die RGB-LED auf Grün
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 255);
    analogWrite(BLUE_PIN, 0);
    delay(1000);

    // Setze die RGB-LED auf Blau
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 255);
    delay(1000);

    // Setze die RGB-LED auf Weiß
    analogWrite(RED_PIN, 255);
    analogWrite(GREEN_PIN, 255);
    analogWrite(BLUE_PIN, 255);
    delay(1000);

    // Setze die RGB-LED auf Aus
    analogWrite(RED_PIN, 0);
    analogWrite(GREEN_PIN, 0);
    analogWrite(BLUE_PIN, 0);
    delay(1000);
}