#define LED_PIN 13
#define BTN_PIN 19
hw_timer_t *My_timer = NULL;
int timerState = 0;
volatile int btnState = 0;
volatile int ledState = 0;
volatile int i = 0;
int masState[] = {2, 2, 2, 2, 2, 2, 10, 2, 10, 2, 10, 2, 2, 2, 2, 2, 2, 2};

void IRAM_ATTR onTimer()
{
 ledState ^= 1;
 timerAlarmWrite(My_timer, masState[i]*100000, true);
 i++;
 if (i > 18) 
 {
   timerAlarmWrite(My_timer, 1000000, true);
   i = 0;
   ledState = 0;
 }
}

void IRAM_ATTR onBtn()
{
 btnState = 1;
}

void setup() {
 pinMode(LED_PIN, OUTPUT);
 pinMode(BTN_PIN, INPUT_PULLUP);
 My_timer = timerBegin(0, 80, true);
 timerAttachInterrupt(My_timer, &onTimer, true);
 timerAlarmWrite(My_timer, 1000000, true);
 attachInterrupt(BTN_PIN, onBtn, CHANGE);
}

void loop() 
{
 if (btnState == 1 && timerState == 0) 
 {
   timerAlarmEnable(My_timer);
   timerState = 1;
   btnState = 0;    
 }
 
 if (btnState == 1 && timerState == 1) 
 {
   timerAlarmDisable(My_timer);
   timerState = 0;
   btnState = 0;
   ledState = 0;
 }

 if (ledState == 1)
 {
   digitalWrite(LED_PIN, HIGH);
  
 }
 else 
 {
   digitalWrite(LED_PIN, LOW);
 }
}