IoT回転灯プロジェクト　設計図

さて、何事にも設計が必要なので簡単に設計図を書きました。

超シンプルですね。

結局のところ、起動時にネット接続を行って、サーバーにアクセス。結果が1だったら回転灯をくるくるさせる。
ってだけの動きです。

そして、arduino IDEのスケッチ例で取得できる。ソースです。

/*
 *  This sketch sends data via HTTP GET requests to data.sparkfun.com service.
 *
 *  You need to get streamId and privateKey at data.sparkfun.com and paste them
 *  below. Or just customize this script to talk to other HTTP servers.
 *
 */

#include <ESP8266WiFi.h>

const char* ssid     = "your-ssid";
const char* password = "your-password";

const char* host = "data.sparkfun.com";
const char* streamId   = "....................";
const char* privateKey = "....................";

void setup() {
  Serial.begin(115200);
  delay(10);

  // We start by connecting to a WiFi network

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

int value = 0;

void loop() {
  delay(5000);
  ++value;

  Serial.print("connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }
  
  // We now create a URI for the request
  String url = "/input/";
  url += streamId;
  url += "?private_key=";
  url += privateKey;
  url += "&value=";
  url += value;
  
  Serial.print("Requesting URL: ");
  Serial.println(url);
  
  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  unsigned long timeout = millis();
  while (client.available() == 0) {
    if (millis() - timeout > 5000) {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
  
  Serial.println();
  Serial.println("closing connection");
}

読んだら分かりますが、これだけでプログラムは終わっていますね…
このスケッチを参考にプログラムを作ってみる。

点灯・消灯はファイルをupload / deleteで判断させようかな。

ファイルは下のurlを参照させるとする。

　http://35.78.51.61/service/revolvinglight/light
ざっぽりコンパイルだけ通したソースがこちら
/*
 *  This sketch sends data via HTTP GET requests to data.sparkfun.com service.
 *
 *  You need to get streamId and privateKey at data.sparkfun.com and paste them
 *  below. Or just customize this script to talk to other HTTP servers.
 *
 */

#include <ESP8266WiFi.h>
#define LIGHT_PIN 13

const char* ssid     = "********";
const char* password = "*********";
const char* host = "www.mmpp.org";
void setup() {
  Serial.begin(115200);
  delay(10);
  // 回転灯の制御pinを出力にする。
  pinMode(LIGHT_PIN, OUTPUT);
  
  // We start by connecting to a WiFi network
  Serial.println("\n");
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  // 回転灯を点灯させるかの判断フラグ
  boolean turnOn = false;
  delay(5000);

  Serial.print("connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  if (!client.connect(host, 80)) {
    Serial.println("connection failed");
    return;
  }
  
  // We now create a URI for the request
  String url = "/service/revolvinglight/light";
  
  Serial.print("Requesting URL: ");
  Serial.println(url);
  
  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  unsigned long timeout = millis();
  while (client.available() == 0) {
    if (millis() - timeout > 5000) {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
    if(line.equals("1")){
      turnOn = true;
    }
  }
  
  Serial.println();
  Serial.println("closing connection");
  if(turnOn){
    // 点灯処理
    digitalWrite(LIGHT_PIN, HIGH);
  }else{
    // 点灯処理    
    digitalWrite(LIGHT_PIN, LOW);
  }
}
むむむっ！

1の値が

　前後に改行を含んでいると言われる…
悩ましいが寝る！明日は休みだからちょっと考えられるな