雲林SONG: 使用Arduino IDE 控制 NodeMcu 上的 LED 燈 ( Arduino Project: Control a Builtin LED from a Web Browser )

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本文要介紹如何使用Arduino IDE 與 NodeMCU 互動。

所需硬體：
1. NodeMCU 板子 x 1
2. Micro USB Cable x 1
3. Wifi Ap x 1

範例一：透過Arduino IDE直接控制NodeMCU上的LED

選擇偏好設定

將下列網址複製到額外的板子管理員網址
http://arduino.esp8266.com/stable/package_esp8266com_index.json

開啟板子管理員

安裝 esp8266 by ESP8266 Community 套件

選擇 NodeMCU 1.0 (ESP-12E Module) 板子

選擇ESP8266內建的範例 Blink

上傳程式到NodeMCU之前，請檢查 NodeMCU 的連接埠為多少，在我的電腦上為COM3。

若沒問題的話，可看到如下影片：

範例二：網頁式控制NodeMCU上的LED
將下列程式碼中的your_wifi_ap_ssid與your_wifi_ap_password修改為要使用的Wifi Ap SSID 與 password

	#include <ESP8266WiFi.h>

	const char* ssid = "your_wifi_ap_ssid";
	const char* password = "your_wifi_ap_password";

	int ledPin = LED_BUILTIN;
	WiFiServer server(80);

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

	pinMode(ledPin, OUTPUT);
	digitalWrite(ledPin, HIGH);

	// Connect to 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");

	// Start the server
	server.begin();
	Serial.println("Server started");

	// Print the IP address
	Serial.print("Use this URL to connect: ");
	Serial.print("http://");
	Serial.print(WiFi.localIP());
	Serial.println("/");

	}

	void loop() {
	// Check if a client has connected
	WiFiClient client = server.available();
	if (!client) {
	return;
	}

	// Wait until the client sends some data
	Serial.println("new client");
	while(!client.available()){
	delay(1);
	}

	// Read the first line of the request
	String request = client.readStringUntil('\r');
	Serial.println(request);
	client.flush();

	// Match the request

	int value = HIGH;
	if (request.indexOf("/LED=ON") != -1) {
	digitalWrite(ledPin, LOW);
	value = LOW;
	}
	if (request.indexOf("/LED=OFF") != -1) {
	digitalWrite(ledPin, HIGH);
	value = HIGH;
	}

	// Return the response
	client.println("HTTP/1.1 200 OK");
	client.println("Content-Type: text/html");
	client.println(""); // do not forget this one
	client.println("<!DOCTYPE HTML>");
	client.println("<html>");

	client.print("Led pin is now: ");

	if(value == LOW) {
	client.print("On");
	} else {
	client.print("Off");
	}
	client.println("<br><br>");
	client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>");
	client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br />");
	client.println("</html>");

	delay(1);
	Serial.println("Client disonnected");
	Serial.println("");
	}