arduino一些内容

/*
  Web client
 
 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield. 
 
 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13
 
 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe, based on work by Adrian McEwen
 
 */

#include <SPI.h>
#include <Ethernet.h>

#define DHT11_PIN 1

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don‘t want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128);  // numeric IP for Google (no DNS)
char server[] = "192.168.1.95";    // name address for Google (using DNS)

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192,168,99,177);

// Initialize the Ethernet client library
// with the IP address and port of the server 
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;


void uploadData(String c,String h){
    // if you get a connection, report back via serial:
  if (client.connect(server, 6543)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET /DHT11Data.ashx?C="+c+"&h="+h+" HTTP/1.1");
    client.println("Host:192.168.1.95");
    client.println("Connection: close");
    
    client.println();
    delay(10);
    // if there are incoming bytes available 
    // from the server, read them and print them:
    while (client.available()) {
      char c = client.read();
      Serial.print(c);
    }
  } 
  else {
    // kf you didn‘t get a connection to the server:
    Serial.println("connection failed");
  }
  
    // if the server‘s disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
  
  }
}

byte read_dht11_dat()
{
  byte i = 0;
  byte result = 0;
  for(i=0;i<8;i++)
  {
    while(!(PINC&_BV(DHT11_PIN)));
    delayMicroseconds(30);
    if(PINC&_BV(DHT11_PIN))
      result|=(1<<(7-i));
    while((PINC&_BV(DHT11_PIN)));
  }
  return result;
}

void setup() {
  
   DDRC|=_BV(DHT11_PIN);
  PORTC|=_BV(DHT11_PIN);
 // Open serial communications and wait for port to open:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip);
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("Ready");


}


void loop()
{
  byte dht11_dat[5];
  byte dht11_in;
  byte i;
  PORTC &= ~_BV(DHT11_PIN);
  delay(18);
  PORTC|=_BV(DHT11_PIN);
  delayMicroseconds(40);
  DDRC &= ~_BV(DHT11_PIN);
  delayMicroseconds(40);
  dht11_in = PINC & _BV(DHT11_PIN);
  if(dht11_in)
  {
    Serial.println("dht11 start condition 1 not met");
    return;
  }

  delayMicroseconds(80);
  dht11_in=PINC & _BV(DHT11_PIN);
  if(!dht11_in)

  {
    Serial.println("dht11 start condition 2 not met");
    return;
  }

  delayMicroseconds(80);
  for(i=0;i<5;i++)
    dht11_dat[i]=read_dht11_dat();
  DDRC|=_BV(DHT11_PIN);
  PORTC|=_BV(DHT11_PIN);
  byte dht11_check_sum = dht11_dat[0]+dht11_dat[1]+dht11_dat[2]+dht11_dat[3];
  if(dht11_dat[4]!=dht11_check_sum)
  {
    Serial.println("DHT11 checksum error");
  }

 uploadData(String(dht11_dat[2]) +"." +String(dht11_dat[3]),String(dht11_dat[0]) +"." +String(dht11_dat[1]) );
 
  Serial.print("Current humdity= ");
  Serial.print(String(dht11_dat[0]));
  Serial.print(".");
  Serial.print(dht11_dat[1],DEC);
  Serial.print("%");
  Serial.print("temperature = ");
  Serial.print(dht11_dat[2],DEC);
  Serial.print(".");
  Serial.print(dht11_dat[3],DEC);
  Serial.println("C");

  delay(1000);
}