// The solution with millis 
// Politeknik Negeri Malang
// One LED blink at rate of 500ms and the other is 100ms
// the 100ms will be forced to wait 1S (500ms*2) because of the delay introduced to blue blink

#define GLED 19
#define BLED 18

const int interval1 = 500;
const int interval2 = 200;
unsigned long bluetimer = millis();
unsigned long greentimer = millis();


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(GLED, OUTPUT);
  pinMode(BLED, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  
  if(millis()-bluetimer >= interval1){
    if(digitalRead(GLED)==LOW){
      digitalWrite(GLED, HIGH);
    }else{
    digitalWrite(GLED, LOW);
    }
    bluetimer=millis();
  }
  
  

  if(millis()-greentimer >= interval2){
    if(digitalRead(BLED)==LOW){
      digitalWrite(BLED, HIGH);
    }else{
    digitalWrite(BLED, LOW);
    }
    greentimer=millis();
  }

  Serial.print("We've been running for : "); Serial.print(millis()); Serial.println(" ms");

  delay(10); // this speeds up the simulation
}