這次稍微研究了一下關於點亮小燈的示例
這個示例主要功能是將D1板連入WIF局域網，然後通過電腦端訪問WEB地址來控制小燈開關。
代碼如下：
/*
* EasyloT sketch tweeked by Barnabybear - original @
* http://iot-playground.com/2-uncategorised/40-esp8266-wifi-relay-switch-arduino-ide
* This sketch demonstrates how to set up a simple HTTP-like server.
* The server will set a GPIO pin depending on the request
* http://server_ip/gpio/0 will set the GPIO2 low,
* http://server_ip/gpio/1 will set the GPIO2 high
* server_ip is the IP address of the ESP8266 module, will be
* printed to Serial when the module is connected.
*/
#include <ESP8266WiFi.h>
const char* ssid = "14L";
const char* password = "19940116";
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
void setup() {
Serial.begin(115200);
delay(10);
// prepare GPIO2
pinMode(2, OUTPUT);
digitalWrite(2, 0);
/* pinMode(3, OUTPUT);
digitalWrite(3, 0);
/*pinMode(4, OUTPUT);
digitalWrite(4, 0);
pinMode(5, OUTPUT);
digitalWrite(5, 0);
pinMode(6, OUTPUT);
digitalWrite(6, 0);
pinMode(7, OUTPUT);
digitalWrite(7, 0);
pinMode(8, OUTPUT);
digitalWrite(8, 0);
pinMode(9, OUTPUT);
digitalWrite(9, 0);
pinMode(10, OUTPUT);
digitalWrite(10, 0);
pinMode(11, OUTPUT);
digitalWrite(11, 0);
pinMode(12, OUTPUT);
digitalWrite(2, 0);
pinMode(13, OUTPUT);
digitalWrite(13, 0);
pinMode(14, OUTPUT);
digitalWrite(14, 0);
pinMode(15, OUTPUT);
digitalWrite(15, 0);
pinMode(16, OUTPUT);
digitalWrite(16, 0);*/
// 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 & instructions
Serial.println(WiFi.localIP());
Serial.println("To control GPIO, open your web browser.");
Serial.println("To set GPIO 0 high, type:");
Serial.print(WiFi.localIP());
Serial.println("/gpio/1");
Serial.println("To set GPIO 0 low, type:");
Serial.print(WiFi.localIP());
Serial.println("/gpio/0");
Serial.println("To toggle GPIO 0, type:");
Serial.print(WiFi.localIP());
Serial.println("/gpio/0");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
delay(100);
return;
}
// Commented out by BB as gets stuck in while loop.
// Wait until the client sends some data
//Serial.println("new client");
//while(!client.available()){
// delay(1);
//}
// Read the first line of the request
String req = client.readStringUntil('\r');
Serial.println(req);
client.flush();
// Match the request
int val;
if (req.indexOf("/gpio/0") != -1)
val = 0;
else if (req.indexOf("/gpio/1") != -1)
val = 1;
else if (req.indexOf("/gpio/4") != -1)
val = (!digitalRead(0)); // <<<<< Edit: insert /gpio/3 lines after this line.
else {
Serial.println("invalid request");
client.print("HTTP/1.1 404\r\n");
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(2, val);
/*digitalWrite(3, val);
/* digitalWrite(4, val);
digitalWrite(5, val);
digitalWrite(6, val);
digitalWrite(7, val);
digitalWrite(8, val);
digitalWrite(9, val);
digitalWrite(10, val);
digitalWrite(11, val);
digitalWrite(12, val);
digitalWrite(13, val);
digitalWrite(14, val);
digitalWrite(15, val);
digitalWrite(16, val);*/
client.flush();
// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now ";
s += (val)?"high":"low";
s += "</html>\n";
// Send the response to the client
client.print(s);
delay(1);
Serial.println("Client disonnected");
// The client will actually be disconnected
// when the function returns and 'client' object is detroyed
}
上傳成功後，D1板上的小燈常亮。
打開電腦瀏覽器，輸入地址後，小燈點亮。
再輸入另外一條地址，小燈熄滅。
