// unsigned long previousMillis = 0;  
// bool ledState = LOW;  

// void setup() {
//   pinMode(13, OUTPUT);  
// }  

// void loop() {
//   unsigned long currentMillis = millis();
//   if (currentMillis - previousMillis >= 200) {
//     previousMillis = currentMillis;
//     ledState = !ledState;
//     digitalWrite(13, ledState);
//   }
// } 
const int ledPin = 13; 
const int interval = 500;
unsigned long previousMillis = 0;  
bool ledState = LOW;  
void setup() {   pinMode(ledPin, OUTPUT);  
}  
void loop() { 
  unsigned long currentMillis = millis();   if (currentMillis - previousMillis >= interval) { 
    previousMillis = currentMillis;      ledState = !ledState; 
    digitalWrite(ledPin, ledState);   } 
} // дз 1