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我有一个Arduino兆兆以太网屏蔽+ SD卡运行传感器数据记录器与DHT22传感器写入传感器数据到SD卡。我试图实现Web服务器从SD卡读取数据。我使用Arduino的例子制作了一个程序，但没有连接到客户端。我检查了以太网屏蔽连接到的计算机的IP地址是192.168.0.107。程序数据记录器部分完美工作，即使使用web服务器实现的代码也不会在编译或将文件发送给arduino时出错。Arduino Datalogger网络服务器无法连接到客户端
主要问题是程序从不进入IF（客户端），因为有？没有客户。
下面是代码：
#include <Dhcp.h>
#include <Dns.h>
#include <Ethernet.h>
#include <EthernetClient.h>
#include <EthernetServer.h>
#include <EthernetUdp.h>
#include <SD.h>
#include <DHT.h>
#include <SPI.h>
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,0,107);
//IPAddress dns1(192,168,0,1);
//IPAddress gateway(192,168,0,1);
//IPAddress subnet(255,255,255,0);
EthernetServer server(80);
#define DHTPIN 7 // what pin we're connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);
const int chipSelect = 4;
void setup() {
// put your setup code here, to run once:
dht.begin();
Ethernet.begin(mac, ip);
server.begin();
Serial.begin(9600);
digitalWrite(10, HIGH);
Serial.print("server is at ");
Serial.println(Ethernet.localIP());
Serial.print("Initializing SD card...");
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
return;
}
Serial.println("card initialized.");
Serial.println("DHT22 Logging sensor data:!");
}
void loop() {
// put your main code here, to run repeatedly:
// Wait beetween reading sensors
delay(4444);
//Reading sensor data
float h = dht.readHumidity();
// Read temperature as Celsius
float t = dht.readTemperature();
// Read temperature as Fahrenheit
float f = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
// Compute heat index
// Must send in temp in Fahrenheit!
float hi = dht.computeHeatIndex(t, h);
File dataFile = SD.open("datalog.CSV", FILE_WRITE);
//writing sensor data to sd card
if (dataFile) {
dataFile.print((float)f);
dataFile.print(" , ");
dataFile.println((float)h);
dataFile.close();
// print to the serial port too:
Serial.print("Temperature = ");
Serial.println(f);
Serial.print("Humidity = ");
Serial.println(h);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.CSV");
}
EthernetClient client = server.available();
if (client) {
Serial.println("client availble");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
Serial.println("connected");
char c = client.read(); // Client data readed
if (c == '\n' && currentLineIsBlank) {
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println();
client.println("<br />");
client.print("Arduino powered webserver");
client.println("<br />");
client.print("Serving temperature and humidity values from a DHT22 sensor");
client.println("<br />");
client.print(f);
client.println("<br />");
client.print("Humidity (%): ");
client.print(h);
client.println("<br />");
Serial.println("kikkihiiri");
break;
}
if (c == '\n') {
// last character on line received
currentLineIsBlank = true;
}
else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
// give the web browser time to receive the data
delay(5);
// close the connection:
client.stop();
Serial.println("Client disconnected");
}
}
我很新的这个东西，所以任何帮助将不胜感激！