int led_pins[8]={19,18,5,17,16,4,0,2};
int on_button=12;
int off_button=14;
bool run=false;
int count=0;

void setup(){
{
  // put your setup code here,to run once:
  Serial.begin(115200);
  Serial.println("Hello,ESP32!");
  pinMode(on-button, INPUT_PULLUP);
  pinMode(off_button, INPUT_PULLUP);
  
}
 for(int i=0;i<8;i++){
  pinMode(led_pins,[i],OUTPUT);
 }
}
 void loop(){
  if(digitalRead(on_button)==0){
    run=true;
  }
   if(digitalRead(off_button)==0){
    run=false;
    all_off();
   }

  //  running led
  if(run==true){
    all_off();
    digitalWrite(led_pins[count++], HIGH);
    delay(1000);

    if(count>=8){
      count=0;
    }
  }
 }