esp32触发相机，测试成功上升沿触发

串口发送命令 up 20000 1 20000 触发

#include <Arduino.h>

const int outputPin = 12;  // 输出引脚
String inputCommand = "";  // 串口输入缓冲区

// 解析命令参数，例如 "up 10 5" 解析为 delayMicrosecondsTime=10, repeatCount=5



// 解析命令参数，例如 "up 10 5" 解析为 delayMicrosecondsTime=10, repeatCount=5
bool parseParameters(String command, int &delayMicrosecondsTime, int &repeatCount) {
  int firstSpace = command.indexOf(' '); // 查找第一个空格位置
  if (firstSpace < 0) return false;     // 没有参数

  int secondSpace = command.indexOf(' ', firstSpace + 1); // 查找第二个空格位置
  if (secondSpace < 0) return false;                     // 参数不完整

  // 提取参数并转换为整数
  String delayMicrosecondsStr = command.substring(firstSpace + 1, secondSpace);
  String repeatStr = command.substring(secondSpace + 1);

  delayMicrosecondsTime = delayMicrosecondsStr.toInt();
  repeatCount = repeatStr.toInt();

  // 检查参数是否合法
  return delayMicrosecondsTime > 0 && repeatCount > 0;
}



// 解析命令参数，例如 "up 10 5 3" 解析为 delayMicrosecondsTime=10, repeatCount=5, additionalParam=3
bool parseParametersThree(String command, int &delayMicrosecondsTime, int &repeatCount, int &additionalParam) {
  int firstSpace = command.indexOf(' '); // 查找第一个空格位置
  if (firstSpace < 0) return false;     // 没有参数

  int secondSpace = command.indexOf(' ', firstSpace + 1); // 查找第二个空格位置
  if (secondSpace < 0) return false;                     // 参数不完整

  int thirdSpace = command.indexOf(' ', secondSpace + 1); // 查找第三个空格位置
  if (thirdSpace < 0) return false;                      // 参数不完整

  // 提取参数并转换为整数
  String delayMicrosecondsStr = command.substring(firstSpace + 1, secondSpace);
  String repeatStr = command.substring(secondSpace + 1, thirdSpace);
  String additionalStr = command.substring(thirdSpace + 1);

  delayMicrosecondsTime = delayMicrosecondsStr.toInt();
  repeatCount = repeatStr.toInt();
  additionalParam = additionalStr.toInt();

  // 检查参数是否合法
  return delayMicrosecondsTime > 0 && repeatCount > 0 && additionalParam > 0;
}

void handleUpCommand(String command) {
  int delayMicrosecondsTime = 0, repeatCount = 0, additionalParam = 0;
  if (parseParametersThree(command, delayMicrosecondsTime, repeatCount, additionalParam)) {
    Serial.println("Triggering UP signal...");
    for (int i = 0; i < repeatCount; i++) {
      digitalWrite(outputPin, HIGH); // 输出高电平
      delayMicroseconds(additionalParam);              // 等待
      digitalWrite(outputPin, LOW);  // 恢复低电平
      delayMicroseconds(delayMicrosecondsTime);              // 等待间隔
    }
  } else {
    Serial.println("Invalid parameters for 'up' command");
  }
}

void handleDownCommand(String command) {
  int delayMicrosecondsTime = 0, repeatCount = 0;
  if (parseParameters(command, delayMicrosecondsTime, repeatCount)) {
    Serial.println("Triggering DOWN signal...");
    for (int i = 0; i < repeatCount; i++) {
      digitalWrite(outputPin, LOW);  // 输出低电平
      delayMicroseconds(delayMicrosecondsTime);              // 等待
      digitalWrite(outputPin, HIGH); // 恢复高电平
      delayMicroseconds(delayMicrosecondsTime);              // 等待间隔
    }
  } else {
    Serial.println("Invalid parameters for 'down' command");
  }
}

void parseCommand(String command) {
  command.trim(); // 去掉多余的空格或换行符
  if (command.startsWith("up")) {
    handleUpCommand(command);
  } else if (command.startsWith("down")) {
    handleDownCommand(command);
  } else {
    Serial.println("Invalid command! Use 'up' or 'down'");
  }
}

void setup() {
  pinMode(outputPin, OUTPUT);   // 设置输出引脚
  digitalWrite(outputPin, LOW); // 初始化输出为低电平
  Serial.begin(9600);           // 初始化串口通信
}

void loop() {
  // 检查是否有串口输入
  while (Serial.available() > 0) {
    char receivedChar = Serial.read();
    if (receivedChar == '\n') { // 检测到回车符，执行命令
      parseCommand(inputCommand);
      inputCommand = ""; // 清空输入缓冲区
    } else {
      inputCommand += receivedChar; // 拼接命令字符
    }
  }
}