我的ESP8266有一个我确实可以理解的问题。我目前正在开发一个安全系统，该系统必须使用一些RFID卡来管理门的访问。
因此，我创建了一个C＃Web API + SQL数据库来管理人员和每个RFID卡。
Web api是基本的，您只需发送“ http：/// api / values /”即可，如果您不在数据库中，则将得到“ GO”或“ Deny”。
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
const char* ssid = "yourNetworkName";
const char* password = "yourNetworkPassword";
void setup () {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print("Connecting..");
}
}
void loop() {
if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
HTTPClient http; //Declare an object of class HTTPClient
http.begin("http://jsonplaceholder.typicode.com/users/1"); //Specify request destination
int httpCode = http.GET(); //Send the request
if (httpCode > 0) { //Check the returning code
String payload = http.getString(); //Get the request response payload
Serial.println(payload); //Print the response payload
}
http.end(); //Close connection
}
delay(30000); //Send a request every 30 seconds
}
...但是一旦我添加了RFID代码...该请求将不再起作用...
代码看起来像这样
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <SPI.h>
#include <MFRC522.h>
#define SS_PIN 5
#define RST_PIN 4
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
const char* ssid = "mywifi";
const char* password = "Password";
void setup () {
Serial.begin(9600);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.print("Connecting..");
}
SPI.begin(); // Initiate SPI bus
mfrc522.PCD_Init(); // Initiate MFRC522
}
void loop() {
// Look for new cards
if ( ! mfrc522.PICC_IsNewCardPresent())
{
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial())
{
return;
}
if (WiFi.status() == WL_CONNECTED) {
//Check WiFi connection status
HTTPClient http; //Declare an object of class HTTPClient
//http://<myip>/api/values/<cardCode>
http.begin("http://<192.168.1.5>/api/values/1231"); //THIS IS A TEST, IT SHOULD WORK WITHOUT ANY PROBLEM!
int httpCode = http.GET(); //Send the request
if (httpCode > 0) { //Check the returning code
String payload = http.getString(); //Get the request response payload
Serial.println(payload); //Print the response payload
}
http.end(); //Close connection
}
delay(30000); //Send a request every 30 seconds
}
这里的问题是我的httpCode返回-1 ...现在响应...
我不明白的是为什么... ESP可以运行...但是没有MFRC522库吗？
提前谢谢！