gistfile1.txt

#include <SoftwareSerial.h>
#include "./DHT.h"

#define DEBUG
#define _ledpin     13

SoftwareSerial esp8266(10, 11); // RX, TX

//*-- DHT11
#define _dhtpin     8
#define _dhttype    DHT11

DHT dht11( _dhtpin, _dhttype );
uint8_t dhtbuf[2];


String SSID = ""; 
String PASS = "";

#define IP "184.106.153.149" // ThingSpeak IP Address: 184.106.153.149
// 使用 GET 傳送資料的格式
// GET /update?key=[THINGSPEAK_KEY]&field1=[data 1]&filed2=[data 2]...;
String GET = "GET /update?key=Q7WJSQJAS2KZMR2O";

void setup()
{
    // Open serial communications and wait for port to open:
    esp8266.begin(115200);
    esp8266.setTimeout(5000);
    Serial.begin(115200); //can't be faster than 19200 for softserial
    Serial.println("ESP8266 Demo");
    //test if the module is ready
    esp8266.println("AT+RST");
    delay(1000);

    if (esp8266.find("ready")) {
        Serial.println("Module is ready");
    } else {
        Serial.println("Module have no response.");

        while (1);
    }

    delay(1000);
    //connect to the wifi
    boolean connected = false;

    for (int i = 0; i < 5; i++) {
        if (connectWiFi()) {
            connected = true;
            break;
        }
    }

    if (!connected) {
        while (1);
    }

    delay(5000);
    //print the ip addr
    /*esp8266.println("AT+CIFSR");
    Serial.println("ip address:");
    while (esp8266.available())
    Serial.write(esp8266.read());*/
    //set the single connection mode
    esp8266.println("AT+CIPMUX=0");

    // DHT11
    dht11.begin();

    pinMode( _ledpin, OUTPUT );
    digitalWrite( _ledpin, LOW );
}

void sendDebug(String cmd)
{
    Serial.print("SEND: ");
    Serial.println(cmd);
    esp8266.println(cmd);
} 

void loop()
{
    dhtbuf[0] = dht11.readHumidity();
    dhtbuf[1] = dht11.readTemperature();

    // 確認取回的溫溼度數據可用
    if (isnan(dhtbuf[0]) || isnan(dhtbuf[1])) {
        Serial.println("Failed to read form DHT11");
    } else {
        digitalWrite(_ledpin, HIGH);
        char buf[3];
        String HH, TT;
        buf[0] = 0x30 + dhtbuf[1] / 10;
        buf[1] = 0x30 + dhtbuf[1] % 10;
        TT = (String(buf)).substring(0, 2);
        buf[0] = 0x30 + dhtbuf[0] / 10;
        buf[1] = 0x30 + dhtbuf[0] % 10;
        HH = (String(buf)).substring(0, 2);

        updateDHT11(TT, HH);
#ifdef DEBUG
        Serial.print("Humidity: ");
        Serial.print(HH);
        Serial.print(" %\t");
        Serial.print("Temperature: ");
        Serial.print(TT);
        Serial.println(" *C\t");
#endif
        digitalWrite(_ledpin, LOW);
    }

    delay(6000);   // 60 second
}

void updateDHT11(String T, String H)
{
    // 設定 ESP8266 作為 Client 端
    String cmd = "AT+CIPSTART=\"TCP\",\"";
    cmd += IP;
    cmd += "\",80";
    sendDebug(cmd);
    delay(2000);

    if (esp8266.find("Error")) {
        Serial.print("RECEIVED: Error\nExit1");
        return;
    }

    cmd = GET + "&field1=" + T + "&field2=" + H + "\r\n";
    esp8266.print("AT+CIPSEND=");
    esp8266.println(cmd.length());

    if (esp8266.find(">")) {
        Serial.print(">");
        Serial.print(cmd);
        esp8266.print(cmd);
    } else {
        sendDebug("AT+CIPCLOSE");
    }

    if (esp8266.find("OK")) {
        Serial.println("RECEIVED: OK");
    } else {
        Serial.println("RECEIVED: Error\nExit2");
    }
}


boolean connectWiFi()
{
    esp8266.println("AT+CWMODE=1");
    String cmd = "AT+CWJAP=\"";
    cmd += SSID;
    cmd += "\",\"";
    cmd += PASS;
    cmd += "\"";
    Serial.println(cmd);
    esp8266.println(cmd);
    delay(2000);

    if (esp8266.find("OK")) {
        Serial.println("OK, Connected to WiFi.");
        return true;
    } else {
        Serial.println("Can not connect to the WiFi.");
        return false;
    }
}