#include <Arduino.h>
// 定义LED引脚
const int ledPins[] = {26, 27, 28, 29, 0}; // LED引脚数组
const int numLEDs = sizeof(ledPins) / sizeof(ledPins[0]); // LED数量

// 定义按键引脚
const int buttonPin = 3; // 按键引脚

// 摩尔斯电码表
const char* morseAlphabet[] = {".-", "-...", "-.-.", "-..", ".", // A-E
                                 "..-.", "--.", "....", "..", ".---", // F-J
                                 "-.-", ".-..", "--", "-.", "---", // K-O
                                 ".--.", "--.-", ".-.", "...", "-", // P-T
                                 "..-", "...-", ".--", "-..-", "-.--", "--.."}; // U-Z

// 点与划的时间
const int dotDuration = 200;
const int dashDuration = dotDuration * 3;
const int interElementDelay = dotDuration;
const int interCharacterDelay = dashDuration;

void setup() {
  // 初始化LED引脚
  for (int i = 0; i < numLEDs; i++) {
    pinMode(ledPins[i], OUTPUT);
    digitalWrite(ledPins[i], LOW); // 初始状态关闭LED
  }
  
  // 初始化按键引脚
  pinMode(buttonPin, INPUT);
  
  // 初始化串口通信
  Serial.begin(9600);
}

// 发送摩尔斯电码
void sendMorseCode(const char* morse) {
  for (int i = 0; morse[i] != '\0'; i++) {
    if (morse[i] == '.') {
      digitalWrite(ledPins[i], HIGH);
      delay(dotDuration);
      digitalWrite(ledPins[i], LOW);
    } else if (morse[i] == '-') {
      digitalWrite(ledPins[i], HIGH);
      delay(dashDuration);
      digitalWrite(ledPins[i], LOW);
    } else if (morse[i] == ' ') {
      delay(interElementDelay);
    }
  }
}

// 检测按键并发送摩尔斯电码对应的字母
void loop() {
  if (digitalRead(buttonPin) == HIGH) { // 如果按键被按下
    // 按下按键发送 "SOS" 的摩尔斯电码
    for (int i = 0; i < 3; i++) {
      sendMorseCode(morseAlphabet[18]); // 'S'
      delay(interCharacterDelay);
      sendMorseCode(morseAlphabet[14]); // 'O'
      delay(interCharacterDelay);
      sendMorseCode(morseAlphabet[18]); // 'S'
      if (i < 2) {
        delay(interCharacterDelay);
      }
    }
    Serial.println("SOS"); // 串口输出 "SOS"
    delay(1000); // 延迟一段时间避免重复发送
  }
}