void setup() {
  Serial.begin(115200);
  //INPUT_PULLUP      開始保持高
  //INPUT_PULLDOWN    開始持保
  pinMode(34, INPUT);
  pinMode(15, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(4, OUTPUT);
  digitalWrite(15, LOW);
  digitalWrite(2, LOW);
  digitalWrite(4, LOW);
}

void loop() {
  int value = analogRead(34);
  Serial.println(value);
  delay(100);
  if (value > 2000) {
    digitalWrite(15, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(4, HIGH);
  } else if (value > 1000) {
    digitalWrite(15, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(4, LOW);
  } else if (value > 500) {
    digitalWrite(15, HIGH);
    digitalWrite(2, LOW);
    digitalWrite(4, LOW);
  } else {
    digitalWrite(15, LOW);
    digitalWrite(2, LOW);
    digitalWrite(4, LOW);
  }
}