默认情况下如何将arduino默认引脚设置为关闭

Question

嗨我正在使用使用arduino蓝牙的移动应用程序编写控制家庭灯光的代码。

但是我希望我的继电器默认初始化，所以如果由于任何电源故障或波动导致arduino重启，我使用的所有设备都会停止运行。

它似乎无法在最初设置它们（休息一切完美），这是我的代码：

String inputs;
#define relay1 2 //Connect relay1 to pin 9
#define relay2 3 //Connect relay2 to pin 8
#define relay3 4 //Connect relay3 to pin 7
#define relay4 5 //Connect relay4 to pin 6
#define relay5 6 //Connect relay5 to pin 5
#define relay6 7 //Connect relay6 to pin 4
#define relay7 8 //Connect relay7 to pin 3
#define relay8 9 //Connect relay8 to pin 2
void setup()
{
  Serial.begin(9600); //Set rate for communicating with phone
  pinMode(relay1, OUTPUT); //Set relay1 as an output
  pinMode(relay2, OUTPUT); //Set relay2 as an output
  pinMode(relay3, OUTPUT); //Set relay1 as an output
  pinMode(relay4, OUTPUT); //Set relay2 as an output
  pinMode(relay5, OUTPUT); //Set relay1 as an output
  pinMode(relay6, OUTPUT); //Set relay2 as an output
  pinMode(relay7, OUTPUT); //Set relay1 as an output
  pinMode(relay8, OUTPUT); //Set relay2 as an output

  digitalWrite(relay1, LOW); //Switch relay1 off
  digitalWrite(relay2, LOW); //Swtich relay2 off
  digitalWrite(relay3, LOW); //Switch relay1 off
  digitalWrite(relay4, LOW); //Swtich relay2 off
  digitalWrite(relay5, LOW); //Switch relay1 off
  digitalWrite(relay6, LOW); //Swtich relay2 off
  digitalWrite(relay7, LOW); //Switch relay1 off
  digitalWrite(relay8, LOW); //Swtich relay2 off
}
void loop()
{
  Serial.println("A");
  while (Serial.available()) //Check if there are available bytes to read
  {
    delay(10); //Delay to make it stable
    char c = Serial.read(); //Conduct a serial read
    if (c == '#') {
      break; //Stop the loop once # is detected after a word
    }
    inputs += c; //Means inputs = inputs + c
  }
  if (inputs.length() > 0)
  {
    Serial.println(inputs);

    if (inputs == "A")
    {
      digitalWrite(relay1, LOW);
    }
    else if (inputs == "a")
    {
      digitalWrite(relay1, HIGH);
    }
    else if (inputs == "B")
    {
      digitalWrite(relay2, LOW);
    }
    else if (inputs == "b")
    {
      digitalWrite(relay2, HIGH);
    }
    else if (inputs == "C")
    {
      digitalWrite(relay3, LOW);
    }
    else if (inputs == "c")
    {
      digitalWrite(relay3, HIGH);
    }
    else if (inputs == "D")
    {
      digitalWrite(relay4, LOW);
    }
    else if (inputs == "d")
    {
      digitalWrite(relay4, HIGH);
    }
    else if (inputs == "E")
    {
      digitalWrite(relay5, LOW);
    }
    else if (inputs == "e")
    {
      digitalWrite(relay5, HIGH);
    }
    else if (inputs == "F")
    {
      digitalWrite(relay6, LOW);
    }
    else if (inputs == "f")
    {
      digitalWrite(relay6, HIGH);
    }
    else if (inputs == "G")
    {
      digitalWrite(relay7, LOW);
    }
    else if (inputs == "g")
    {
      digitalWrite(relay7, HIGH);
    }
    else if (inputs == "H")
    {
      digitalWrite(relay8, LOW);
    }
    else if (inputs == "h")
    {
      digitalWrite(relay8, HIGH);
    }
    inputs = "";
  }
}