人体感应模块控制LCD1602背景灯是否开启

/*
  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>
#include <LiquidCrystal.h>

#define ResetPIN 7

// 初始化引脚
LiquidCrystal lcd(, , , , , );

// 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, 0xAA, 0xCE, 0xEA, 0xFF, 0xE1 };
// 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[] = "192.168.9.6";    // name address for Google (using DNS)
String clientPwd="-1";

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(,,,);
IPAddress gateway(,,,);
IPAddress dns_server(,,,);
IPAddress subnet(,,,);
// 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;

int errCount=;

void setup() {

  //LCD
  // 设置行列值
  lcd.begin(, );

   pinMode(ResetPIN,OUTPUT);
   digitalWrite(ResetPIN,LOW);   

 // Open serial communications and wait for port to open:
  Serial.begin();
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  // start the Ethernet connection:
  // give the Ethernet shield a second to initialize:
   if (Ethernet.begin(mac) == ) {
    Serial.println("Failed to configure Ethernet using DHCP");
    Ethernet.begin(mac, ip,dns_server,gateway,subnet);
  }

  delay();
  Serial.println("Ready");
}

void loop()
{

 Serial.println(clientPwd);
 // 打印字符串
 lcd.setCursor(,);
 lcd.print(clientPwd);

 httpRequest();
 delay();

}

//================Http Request Code========================
void httpRequest(){
    // if you get a connection, report back via serial:

  if(!client.connected()){
     Serial.println("disconnecting.");
     client.stop();
     if (client.connect(server, )) {
        Serial.println("connected");
     }else{
     // kf you didn't get a connection to the server:
        Serial.println("connection failed");
        errCount++;
        if(errCount>=){
          digitalWrite(ResetPIN,HIGH);
          delay();
        }
    }
  } else{

    // Make a HTTP request:
    client.println("GET /main.ashx?m=c&mil=" + String(millis()) + "&cpwd="+clientPwd+"&rf=0" +" HTTP/1.1");
    client.println("Host:" +String(server));
    //client.println("Connection: close");

    client.println();
    delay();
    String reply="";
    // if there are incoming bytes available
    // from the server, read them and print them:
    while (client.available()) {
      char c = client.read();
      reply+=c;

    }
    //Serial.print(reply);
    int index=reply.indexOf("\"Model\":\"8888");
    if(index>=){
      index=index+;
      clientPwd= reply.substring(index,index+);
      Serial.println("Changed:" + clientPwd);

    }

    errCount=;
    //wdt_reset();
  }

}
//================End Http Request Code===============

arduino网卡扩展板，会使用 2,10,11,12,13 i/o口，所以要调整lcd使用的接口

人体感应器信号输出连S9013三极管（来控制lcd背景灯的亮与灭（使用K编号的脚)

/*
  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>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <avr/wdt.h>  

#define ResetPIN 7
#define HasManPIN 8
#define RebootPIN 6

// 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, 0xAA, 0xCE, 0x3A, 0x6F, 0xE1 };
// 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[] = "192.168.9.6";    // name address for Google (using DNS)
String clientPwd="-1";
int hasMan=;
LiquidCrystal_I2C lcd(0x27,,); 

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(,,,);
IPAddress gateway(,,,);
IPAddress dns_server(,,,);
IPAddress subnet(,,,);
// 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;

int errCount=;
unsigned long lastRequest=;

void setup() {

   pinMode(HasManPIN,INPUT);
   pinMode(ResetPIN,OUTPUT);
   pinMode(RebootPIN,OUTPUT);

   digitalWrite(ResetPIN,LOW);
   digitalWrite(RebootPIN,LOW);

 // Open serial communications and wait for port to open:
  Serial.begin();
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  // start the Ethernet connection:
  // give the Ethernet shield a second to initialize:
   if (Ethernet.begin(mac) == ) {
    Serial.println("Failed to configure Ethernet using DHCP");
    Ethernet.begin(mac, ip,dns_server,gateway,subnet);
  }

  lcd.init();
  lcd.backlight();
  lcd.print("-1");
  delay();
  Serial.println("Ready");
  lastRequest=millis();

  wdt_enable(WDTO_8S);
}

void loop()
{
  //digitalWrite(RebootPIN,LOW);

  if((millis()-lastRequest)>=){
       Serial.println("reboot");
       digitalWrite(ResetPIN,HIGH);
       delay();
  }
 Serial.println("lcd...");
 Serial.println(clientPwd);
 // 打印字符串
 lcd.setCursor(,);
 lcd.print(clientPwd);

  //digitalWrite(RebootPIN,HIGH);

 hasMan=digitalRead(HasManPIN);
 Serial.println(hasMan);
 if(hasMan==){
  lcd.backlight();
  }else{
   lcd.noBacklight();
 }

 if( (millis() - lastRequest) >=)
 {
    httpRequest();
    lastRequest=millis();
 }

 delay();
  Serial.println("lcd over!");
 //
  wdt_reset();

}

//================Http Request Code========================
void httpRequest(){
    // if you get a connection, report back via serial:

  if(!client.connected()){
     Serial.println("disconnecting.");
     client.stop();
     if (client.connect(server, )) {
        Serial.println("connected");
     }else{
     // kf you didn't get a connection to the server:
        Serial.println("connection failed");
        errCount++;
        if(errCount>=){
          digitalWrite(ResetPIN,HIGH);
          delay();
        }
    }
  } else{

    // Make a HTTP request:
    client.println("GET /main.ashx?m=c&mil=" + String(millis()) + "&cpwd="+clientPwd+"&rf="+String(hasMan) +" HTTP/1.1");
    client.println("Host:" +String(server));
    //client.println("Connection: close");

    client.println();
    delay();
    String reply="";
    // if there are incoming bytes available
    // from the server, read them and print them:
    while (client.available()) {
      char c = client.read();
      reply+=c;

    }
    //Serial.print(reply);
    int index=reply.indexOf("\"Model\":\"8888");
    if(index>=){
      index=index+;
      clientPwd= reply.substring(index,index+);
      Serial.println("Changed:" + clientPwd);

    }

    errCount=;
    //wdt_reset();
  }

}
//================End Http Request Code===============