请，我的代码有问题。我想让我的arduino测量温度和湿度，从NTP服务器获取时间和日期，并将这些数据发送到网站，PHP脚本将从这些数据中捕获它们并将其发送到服务器。
我认为我的问题在于我的状况，而不是工作原理。
现在如何工作： Arduino正在从DHT22传感器（温度和湿度）读取数据，并从NTP服务器更新时间，并且所有这些都将在LCD监视器16x2上显示。 但是，当我尝试通过Internet浏览器（Chrome和iExplorer）通过其IP地址连接到它时，它尝试连接，但过一会儿，打印该服务器未发送任何要加载的数据或网页，或者它加载了多个HTTP标头（ HTTP / 1.1 200 OK内容类型：text / html连接：close）并将它们打印到屏幕上...
我尝试修复了一个多月，但未成功。
我的硬件：Arduino Uno，带SD卡的Arduino以太网屏蔽，DHT22传感器，LCD显示器。
我的代码：
#include <Ethernet.h>
#include <SPI.h>
#include <SD.h>
#include <LiquidCrystal.h>
#include <DHT.h>
#include <EthernetUdp.h>
#include <TimeLib.h>
#define DHTPIN 3
#define DHTTYPE DHT22
DHT dht (DHTPIN,DHTTYPE);
File webPage;
String HTTP_req="";
const int rs = 5, en = 6, d4 = 7, d5 =8, d6 = 9, d7 = 2;
LiquidCrystal lcd(rs,en,d4,d5,d6,d7);
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192,168,243,253);
IPAddress subnet(255,255,252,0);
IPAddress gateway(192,168,240,2);
IPAddress dns(192,168,240,55);
IPAddress timeServer(192,168,240,55);
EthernetServer server(80);
const int timeZone = 2;
EthernetUDP Udp;
unsigned int localPort = 8888;
void setup() {
Ethernet.begin(mac,ip,dns,gateway,subnet);
lcd.begin(16,2);
lcd.display();
dht.begin();
Serial.begin(9600);
Udp.begin(localPort);
setSyncProvider(getNtpTime);
}
void loop() {
EthernetClient client = server.available();
float t = dht.readTemperature();
float h = dht.readHumidity();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read(); // read 1 byte (character) from client
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if ( HTTP_req.length() < 80)
HTTP_req += c; // save the HTTP request 1 char at a time
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("Connection: close");
client.println();
// send web page
if (HTTP_req.indexOf("ajaxrefresh") >= 0 ) {
ajaxRequest(client); //update the analog values
break;
}
else {
webPage = SD.open("index.htm"); // open web page file
if (webPage) {
while (webPage.available()) {
client.write(webPage.read()); // send web page to client
}
webPage.close();
}
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}else{
client.stop();
}
}
// give the web browser time to receive the data
delay(5);
// close the connection:
HTTP_req = "";
Serial.println("client disconnected");
} // end if (client)
else {
if (isnan(h) || isnan(t)) {
lcd.setCursor(0,0);
if (second()==1) {
digitalClockDisplay();
}
else{
lcd.setCursor(0,1);
lcd.print(" SENSOR ERROR ");
}
}
else {
lcd.setCursor(0,0);
if (second()==1) {
digitalClockDisplay();
Serial.println("Time and Date uploaded.");
delay(1001);
}
else {
lcd.setCursor(0,1); // Sets cursor on the next line
lcd.print(h,1); // Prints the humidity value from the sensor
lcd.print(" % ");
lcd.setCursor(9,1);
lcd.print(t,1);
lcd.print(" ");
lcd.print(char(223));
lcd.print("C");
}
}
}
}
void digitalClockDisplay() {
printDigits(hour());
lcd.print(":");
printDigits(minute());
lcd.print(" ");
lcd.print(day());
lcd.print(".");
lcd.print(month());
lcd.print(".");
lcd.print(year());
}
void printDigits(int digits) {
if(digits < 10)
lcd.print('0');
lcd.print(digits);
}
const int NTP_PACKET_SIZE = 48;
byte packetBuffer[NTP_PACKET_SIZE];
time_t getNtpTime() {
while (Udp.parsePacket() > 0) ; // discard any previously received packets
sendNTPpacket(timeServer);
uint32_t beginWait = millis();
while (millis() - beginWait < 1500) {
int size = Udp.parsePacket();
if (size >= NTP_PACKET_SIZE) {
Udp.read(packetBuffer, NTP_PACKET_SIZE); // read packet into the buffer
unsigned long secsSince1900;
// convert four bytes starting at location 40 to a long integer
secsSince1900 = (unsigned long)packetBuffer[40] << 24;
secsSince1900 |= (unsigned long)packetBuffer[41] << 16;
secsSince1900 |= (unsigned long)packetBuffer[42] << 8;
secsSince1900 |= (unsigned long)packetBuffer[43];
return secsSince1900 - 2208988800UL + timeZone * SECS_PER_HOUR;
}
}
return 0; // return 0 if unable to get the time
}
void sendNTPpacket(IPAddress &address) {
// set all bytes in the buffer to 0
memset(packetBuffer, 0, NTP_PACKET_SIZE);
// Initialize values needed to form NTP request
packetBuffer[0] = 0b11100011; // LI, Version, Mode
packetBuffer[1] = 0; // Stratum, or type of clock
packetBuffer[2] = 6; // Polling Interval
packetBuffer[3] = 0xEC; // Peer Clock Precision
// 8 bytes of zero for Root Delay & Root Dispersion
packetBuffer[12] = 49;
packetBuffer[13] = 0x4E;
packetBuffer[14] = 49;
packetBuffer[15] = 52;
// all NTP fields have been given values, now
// you can send a packet requesting a timestamp:
Udp.beginPacket(address, 123); //NTP requests are to port 123
Udp.write(packetBuffer, NTP_PACKET_SIZE);
Udp.endPacket();
}
void ajaxRequest(EthernetClient client)
{
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("<br />");
}
}
请帮助我，我真的很需要它。