智能门卡 ESP8266 程序

智能门卡是一个基于ESP8266的智能门禁系统，它通过WiFi连接到互联网，用户可以通过手机App远程开关门。下面是一个ESP8266的智能门卡程序示例，供您参考：

#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <MFRC522.h>
#include <ArduinoJson.h>

#define SS_PIN D4
#define RST_PIN D3

MFRC522 mfrc522(SS_PIN, RST_PIN);

const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* serverUrl = "your_SERVER_URL";

ESP8266WebServer server(80);

void setup() {
  Serial.begin(9600);
  SPI.begin();
  mfrc522.PCD_Init();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("WiFi connected");

  server.on("/", handleRoot);
  server.begin();
  Serial.println("HTTP server started");
}

void loop() {
  server.handleClient();

  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) {
    Serial.println("Card detected");

    String cardId = String(mfrc522.uid.uidByte[0]) + String(mfrc522.uid.uidByte[1]) + String(mfrc522.uid.uidByte[2]) + String(mfrc522.uid.uidByte[3]);
    Serial.println("Card ID: " + cardId);

    HTTPClient http;
    String url = serverUrl + "?cardId=" + cardId;
    http.begin(url);
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) {
      Serial.println("Response code: " + String(httpResponseCode));
      String payload = http.getString();
      Serial.println("Response payload: " + payload);
      DynamicJsonDocument doc(1024);
      deserializeJson(doc, payload);
      bool success = doc["success"];
      if (success) {
        Serial.println("Access granted");
        server.send(200, "text/plain", "Access granted");
      } else {
        Serial.println("Access denied");
        server.send(401, "text/plain", "Access denied");
      }
    } else {
      Serial.println("Error: " + String(httpResponseCode));
      server.send(500, "text/plain", "Error");
    }
    http.end();
  }
}

void handleRoot() {
  server.send(200, "text/plain", "Hello world");
}

这个示例代码使用了ESP8266的WiFi功能、HTTP客户端和MFRC522射频读写模块，通过读取门卡的UID号码，将其发送到远程服务器进行验证。如果验证通过，则通过HTTP响应返回“Access granted”，门禁系统开门；如果验证未通过，则返回“Access denied”，门禁系统不开门。您需要根据实际需要编写服务器端代码，并将serverUrl变量更新为服务器URL。