１つのボタンと３つのLED

const int LED0 = 2;
const int LED1=7;
const int LED2=12;
const int BUTTON0 = 3; 

int val = 0;
void setup() {
  pinMode(LED0, OUTPUT); 
  pinMode(LED1, OUTPUT); 
  pinMode(LED2,OUTPUT); 
  pinMode(BUTTON0, INPUT);
  Serial.begin(9600);
}
void loop() {
  
  val = digitalRead(BUTTON0); 
  Serial.println(val);
  if (val == HIGH) {
    digitalWrite(LED0, HIGH);
    delay(1000);
    digitalWrite(LED0,LOW);
    delay(1000);
    digitalWrite(LED0,HIGH);
    delay(1000);
    digitalWrite(LED0,LOW);
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,HIGH);
    delay(1000);
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
     digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
    delay(random(1,1000));
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
    delay(random(1,1000));
   } else {
    digitalWrite(LED0, LOW);
}

前作った回路はそのままにコードだけ書き換えてみた。

button０を押す
↓
LED０が２回光る（点灯１秒→消灯１秒→点灯１秒）
↓
LED１と２が同時に光る（１秒）
↓
LED１と２が交互に光る。
光る時間は０．００１秒～１秒の間でランダムに光る。

とりあえず考えてみたのはこれだけ。
もう２つはまた別の書き方で動かしたい。