#define led_pin1 32
#define led_pin2 33
#define led_pin3 25
#define button_pin 26

int i=0;
 
hw_timer_t * timer1 = NULL;
hw_timer_t * timer2 = NULL;
hw_timer_t * timer3 = NULL;
 
void IRAM_ATTR onTimer1() {
  digitalWrite(led_pin1, !digitalRead(led_pin1));
}

void IRAM_ATTR toggleLED() {
  //write here code to change LOW->HIGH and HIGH->LOW
  i=1;
}

void IRAM_ATTR onTimer2() {
  digitalWrite(led_pin2, !digitalRead(led_pin2));
}

void IRAM_ATTR onTimer3() {
  digitalWrite(led_pin3, !digitalRead(led_pin3));
}
 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(led_pin1, OUTPUT);
  pinMode(led_pin2, OUTPUT);
  pinMode(led_pin3, OUTPUT);
 
  timer1 = timerBegin(0, 80, true);
  timerAttachInterrupt(timer1, &onTimer1, true);
  timerAlarmWrite(timer1, 500000, true);
  timerAlarmEnable(timer1);

  timer2 = timerBegin(1, 80, true);
  timerAttachInterrupt(timer2, &onTimer2, true);
  timerAlarmWrite(timer2, 800000, true);
  timerAlarmEnable(timer2);

  timer3 = timerBegin(2, 80, true);
  timerAttachInterrupt(timer3, &onTimer3, true);
  timerAlarmWrite(timer3, 1200000, true);
  timerAlarmEnable(timer3);

  attachInterrupt(button_pin, toggleLED, FALLING);
}
 
void loop() {
  if (i==1) {
    timerAlarmDisable(timer1);
    timerAlarmDisable(timer2);
    timerAlarmDisable(timer3);
    digitalWrite(led_pin1, LOW);
    digitalWrite(led_pin2, LOW);
    digitalWrite(led_pin3, LOW);
    delay(2000);
    timerAlarmEnable(timer1);
    timerAlarmEnable(timer2);
    timerAlarmEnable(timer3);
    i=0;
  }
}