//https://blog.wokwi.com/5-ways-to-blink-an-led-with-arduino/

#define LED_PIN12 12 // must support PWM
#define LED_PIN8 8 // must support PWM
#define LED_PIN3 3 // must support PWM



void setup() {  
  pinMode(LED_PIN12, OUTPUT);
  pinMode(LED_PIN8, OUTPUT);
  pinMode(LED_PIN3, OUTPUT);
}



void loop() {
  digitalWrite(LED_PIN12, (millis() / 260) % 2);
  digitalWrite(LED_PIN8, (millis() / 460) % 2);
  digitalWrite(LED_PIN3, (millis() / 660) % 2); 


}