ESP32 Simple WiFi Server を試してみた

ESP32なら WiFi の機能を試してみなければということで、ESP32 のライブラリの中になるサンプルプログラムを試してみました。





場所は "Documents\Arduino\hardware\espressif\esp32\libraries\WiFi\examples にあります。念のため、サンプルプログラムを貼っておきます。自宅の環境にあわせて SSID と Password を変更しておいてください。

/*
 WiFi Web Server LED Blink

 A simple web server that lets you blink an LED via the web.
 This sketch will print the IP address of your WiFi Shield (once connected)
 to the Serial monitor. From there, you can open that address in a web browser
 to turn on and off the LED on pin 5.

 If the IP address of your shield is yourAddress:
 http://yourAddress/H turns the LED on
 http://yourAddress/L turns it off

 This example is written for a network using WPA encryption. For
 WEP or WPA, change the Wifi.begin() call accordingly.

 Circuit:
 * WiFi shield attached
 * LED attached to pin 5

 created for arduino 25 Nov 2012
 by Tom Igoe

ported for sparkfun esp32 
31.01.2017 by Jan Hendrik Berlin
 
 */

#include 

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

WiFiServer server(80);

void setup()
{
    Serial.begin(115200);
    pinMode(4, OUTPUT);      // set the LED pin mode

    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());
    
    server.begin();

}

int value = 0;

void loop(){
 WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,
    Serial.println("New Client.");           // print a message out the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println();

            // the content of the HTTP response follows the header:
            client.print("Click here to turn the LED on pin 4 on.
");
            client.print("Click here to turn the LED on pin 4 off.
");

            // The HTTP response ends with another blank line:
            client.println();
            // break out of the while loop:
            break;
          } else {    // if you got a newline, then clear currentLine:
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }

        // Check to see if the client request was "GET /H" or "GET /L":
        if (currentLine.endsWith("GET /H")) {
          digitalWrite(4, HIGH);               // GET /H turns the LED on
        }
        if (currentLine.endsWith("GET /L")) {
          digitalWrite(4, LOW);                // GET /L turns the LED off
        }
      }
    }
    // close the connection:
    client.stop();
    Serial.println("Client Disconnected.");
  }
}

LEDはサンプルでは LED は 5番ピンでしたが、私は4番ピンに変更しています。Arduino のシリアルモニタを立ち上げておくと、取得したIPアドレスが分かります。

Connecting to xxxxxxxx
.........
WiFi connected.
IP address: 
192.168.2.118

それでは実際の動きをみてみましょう。




今回はビデオ作成用に新しいツールを導入したので、ちょっと凝って Picture In Picture ＋音楽を試してみました。なんとこれフリーなんですよね。こちらの記事もそのうち。
（＾_＾）／~

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waves ESP32-DevKitC ESP-WROOM-32 ESP32 DevKitC V2 WiFi BLE 技適取得済 国内発送

• 出版社/メーカー: waves（ウェイブス）
• メディア: エレクトロニクス

ESP-WROOM-32 WiFi + Bluetooth 無線モジュール　お得な2個セット

• 出版社/メーカー: マイクロテクニカ
• メディア: エレクトロニクス

SparkFun ESP32 Thing Development Workshop (English Edition)

• 出版社/メーカー: PE Press
• 発売日: 2017/04/09
• メディア: Kindle版

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