int led=13;
int btn_1=10;
int btn_2=9;

void setup() {
pinMode(led, OUTPUT);
pinMode(btn_1, INPUT);
pinMode(btn_2, INPUT);

Serial.begin(9600);
}

unsigned long lastClock = 0;  // Timer for 3-second delay

int delay_time=1000;

void loop() {

delay_up();
delay_down();
Serial.println(delay_time);

if (millis() - lastClock > delay_time) {

digitalWrite(led, !digitalRead(led));

lastClock = millis();  // Reset the timer
}

// if (millis() - lastClock > 10) {

// delay_up();
// delay_down();
// Serial.println(delay_time);

//     lastClock = millis();  // Reset the timer
//   }
}


void delay_up(){
int rd= digitalRead(btn_1);
if(rd && delay_time<10000){
delay_time+=1000;
}
delay(100);
//Serial.println(delay_time);
}


void delay_down(){
int rd2= digitalRead(btn_2);
if(rd2 && delay_time>0){
delay_time-=200;
}
delay(100);
//Serial.println(delay_time);

}