arduino esp32 读福申甲醛传感器

arduino需求描述可以通过几行代码来完成。
缺点是不能Debug。
继续监测甲醛的变化。
使用杜邦线连接，需要转换传感器输出线焊接杜邦线。
杜邦线是一公一母。

可以开启软AP，也可连接到无线路由器。
买到的UNO D1 R32 ，无线性能差，距离路由器2米，信号强度超过-90。
将网络改为这里AP。

#include  #include  #include  #include  #include   #define ESP_getChipId() ((uint32_t)ESP.getEfuseMac()) #define MAX_CLIENTS 4  // http using namespace httpsserver; HTTPServer secureServer = HTTPServer(); void handleRoot(HTTPRequest * req, HTTPResponse * res); char crc(String s);  int data = 0; float value = 0; String buffer = ""; String buffer2 = ""; String result;  class ChatHandler : public WebsocketHandler { 
           public:     static WebsocketHandler* create();
    void onClose();
};
ChatHandler* activeClients[MAX_CLIENTS];

void setup() { 
        
  // Initialize the slots
  for (int i = 0; i < MAX_CLIENTS; i++) activeClients[i] = nullptr;

  Serial.begin(9600);
  Serial2.begin(9600);

  // wifi
  IPAddress ip(192, 168, 3, 1);
  IPAddress gw(192, 168, 3, 1);
  IPAddress mask(255, 255, 255, 0);
  WiFi.softAPConfig(ip, gw, mask);
  String chip_id = "ESP_" + String(ESP_getChipId());
  const char *ssid = chip_id.c_str();
  WiFi.softAP(ssid);

  // http
  ResourceNode * nodeRoot = new ResourceNode("/", "GET", &handleRoot);
  secureServer.registerNode(nodeRoot);
  // chat register
  WebsocketNode * chatNode = new WebsocketNode("/chat", &ChatHandler::create);
  secureServer.registerNode(chatNode);

  secureServer.start();

  //
}

void loop() { 
        
  // 读甲醛传感器
  while (Serial2.available() > 0) { 
        
    data = Serial2.read();
    Serial.println(data);

    buffer += (char)data;
    buffer2 += String(data, HEX) + " ";

  }  // while 0

  if (buffer.charAt(0) == 0xff && buffer.length() == 9) { 
        
    // 验证crc
    char crcValue = crc(buffer);
    if (crcValue == buffer.charAt(8))
      value = (float)(buffer.charAt(4) * 256 + buffer.charAt(5)) / 1000.0;
    else
      Serial.println("crc not equal");
    buffer = "";
    result = "结果：" + String(value) + "，数据：" + buffer2;
    buffer2 = "";
  }  // if 1

  if (buffer.length() >= 9)
    buffer = "";

  Serial2.flush();

  // web
  secureServer.loop();

  // 发送数据
  for (int i = 0; i < MAX_CLIENTS; i++) { 
        
    if (activeClients[i] != nullptr) { 
        
      activeClients[i]->send(result.c_str(), WebsocketHandler::SEND_TYPE_TEXT);
    }
  }

  // delay
  delay(100);

  // loop
}


void handleRoot(HTTPRequest * req, HTTPResponse * res) { 
        
  // Status code is 200 OK by default.
  // We want to deliver a simple HTML page, so we send a corresponding content type:
  res->setHeader("Content-Type", "text/html");

  // The response implements the Print interface, so you can use it just like
  // you would write to Serial etc.
  res->println("");
  res->println("");
  res->println("");
  res->println("");
  res->println("
甲醛读数
");

  res->print("
服务器已运行 ");
  res->print((int)(millis() / 1000 / 60), DEC);
  res->println(" 分.
");

  res->println("
数值（毫克/立方米.）： 
");
  res->print("
");
  res->print(value, DEC);
  res->println("
");

  res->println("");
  res->println("");

  res->print(
    " \n"
  );
}

WebsocketHandler * ChatHandler::create() { 
        
  Serial.println("Creating new chat client!");
  ChatHandler * handler = new ChatHandler();
  for (int i = 0; i < MAX_CLIENTS; i++) { 
        
    if (activeClients[i] == nullptr) { 
        
      activeClients[i] = handler;
      break;
    }
  }
  return handler;
}

// When the websocket is closing, we remove the client from the array
void ChatHandler::onClose() { 
        
  for (int i = 0; i < MAX_CLIENTS; i++) { 
        
    if (activeClients[i] == this) { 
        
      activeClients[i] = nullptr;
    }
  }
}

// CRC计算
char crc(String s) { 
        
  int sum = 0;
  for (int i = 1; i < s.length() - 1; i++)
    sum += s[i];
  int value = ~sum + 1;
  return value & 0xff;

}