EEPW论坛

除了LCD显示，读取模拟值（湿度传感器）以外，还要控制继电器

这个就更简单了，就是给高电平或者低电平就可以啦

// Demo for Grove - Starter Kit V2.0

// Uses the Grove - Button to control the Grove - Relay.
// When the button is pressed, the relay will be in the "closed" position.
// Connect the Grove - Button to the socket marked D3
// Connect the Grove - Relay to D8

// Define the pins to which the button and relay are attached.
const int buttonPin = 3;
const int relayPin =  8;

void setup()
{
    // Configure the relay's pin for output signals.
    pinMode(relayPin, OUTPUT);

    // Configure the button's pin for input signals.
    pinMode(buttonPin, INPUT);
}

void loop()
{
    // Read the state of the button.
    int buttonState = digitalRead(buttonPin);

    // If the button is pressed, activate (close) the relay.
    if (buttonState == 1)   
    {
        digitalWrite(relayPin, HIGH);
    }
    else   
    {
        digitalWrite(relayPin, LOW);
    }
    delay(10);
}

试了一下Intel Edison自带的wifi server例子，根本没法跑起来

诸位同仁有成功的吗？

扫描无线网的可以扫到
WIFI也可以连上

但是WIFI服务器就是无法通过浏览器访问

可以参考一下这里

6：搭建WEBSERVER

/*
  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
 modified 9 Apr 2012
 by David A. Mellis
 
 */

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

// 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 };
IPAddress server(221,200,245,242); // Google

// 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 setup() {
 // 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:
    for(;;)
      ;
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("GET / HTTP/1.0");
    client.println();
  } 
  else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
}

void loop()
{
  // if there are incoming bytes available 
  // from the server, read them and print them:
  if (client.available()) {
    char c = client.read();
    Serial.print(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();

    // do nothing forevermore:
    for(;;)
      ;
  }
}

使用usb以太网的网络客户端

因为google被封锁，所以我将IP换成了我自己搭建的服务器IP

返回内容如下：

HTTP/1.1 200 OK
Date: Fri, 09 Sep 2016 01:04:32 GMT
Server: Apache/2.4.10 (Raspbian)
Last-Modified: Sat, 11 Jun 2016 00:44:09 GMT
ETag: "d-534f5f40499a6"
Accept-Ranges: bytes
Content-Length: 13
Connection: close
Content-Type: text/html

Hello World!

/*
  Web client
 
 This sketch connects to a website (http://www.google.com)
 using a WiFi shield.
 
 This example is written for a network using WPA encryption. For 
 WEP or WPA, change the Wifi.begin() call accordingly.
 
 This example is written for a network using WPA encryption. For 
 WEP or WPA, change the Wifi.begin() call accordingly.
 
 Circuit:
 * WiFi shield attached
 
 created 13 July 2010
 by dlf (Metodo2 srl)
 modified 31 May 2012
 by Tom Igoe
 */


#include 
#include 

char ssid[] = "MYWIFI"; //  your network SSID (name) 
char pass[] = "xxxxxx";    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
// 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[] = "iot.godpub.com";    // name address for Google (using DNS)

// 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):
WiFiClient client;

void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(9600); 
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  
  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present"); 
    // don't continue:
    while(true);
  } 

  String fv = WiFi.firmwareVersion();
  if( fv != "1.1.0" )
    Serial.println("Please upgrade the firmware");
  
  // attempt to connect to Wifi network:
  while (status != WL_CONNECTED) { 
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:    
    status = WiFi.begin(ssid, pass);
  
    // wait 10 seconds for connection:
    delay(10000);
  } 
  Serial.println("Connected to wifi");
  printWifiStatus();
  
  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected to server");
    // Make a HTTP request:
    client.println("GET / HTTP/1.1");
    client.println("Host: iot.godpub.com");
    client.println("Connection: close");
    client.println();
  }
}

void loop() {
  // if there are incoming bytes available 
  // from the server, read them and print them:
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting from server.");
    client.stop();

    // do nothing forevermore:
    while(true);
  }
}


void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

因为USB以太网需要连接电脑，而实际应用中，链接电脑不太现实
不能为了自动浇花配置个电脑

所以使用WIFI还是比较方便的

其中"MYWIFI"是我的无线网ID
"xxxxxx"是我的无线网密码

iot.godpub.com 是我自建的web服务器域名

 串口返回的全部信息如下：

Attempting to connect to SSID: MYWIFI
Connected to wifi
SSID: MYWIFI
IP Address: 192.168.249.243
signal strength (RSSI):-40 dBm

Starting connection to server...
connected to server
HTTP/1.1 200 OK
Date: Fri, 09 Sep 2016 01:04:32 GMT
Server: Apache/2.4.10 (Raspbian)
Last-Modified: Sat, 11 Jun 2016 00:44:09 GMT
ETag: "d-534f5f40499a6"
Accept-Ranges: bytes
Content-Length: 13
Connection: close
Content-Type: text/html

Hello World!

坐 台 威 武，下 面 呢？

温湿度以及是否灌溉信息定时通过HTTP协议上报至网络。

GET请求格式大致如下：

/water.php?h=222&t=28.2&s=1

其中:

H为湿度
T为温度
s为是否执行灌溉

详见代码。

服务器端应该实现的功能包括但不限于：

接收并存储数据到数据库

提供展示页面以表格或者其它直观的方式展示数据。

本例中我使用BANAPI M2+ 自建了LMAP网站环境。

使用PHP接收数据。

因为服务器端属于另外的范畴，本例不做深入讨论。

服务器端最简单的示例代码如下：

<?php

printf("Humidity:\t%.2f\n", $_GET['h']);

printf("Temperature:\t%.2f\n", $_GET['t']);

$status = $_GET['s']==0?"False":"True";

printf("Watered:\t%s\n", $status);

?>

 

主要作用为将Edison发送的数据以一定格式显示。

可用于调试Edison发送网络数据部分。