รวมประสบการณ์จากงานสอน และเรื่องที่พบพาน: ESP8266 Web Server On-Of Toggle LED

ตัวอย่่างโปรแกรม NodeMCU V2 สั่งเปิดปิดไฟผ่าน GPIO โดยให้ ESP8266 เป็น Web Server

#include <ESP8266WiFi.h>

const char* ssid = "Wifi SSID";
const char* password = "Wifi Password";

int led1=1;
int led2=2;
int led3=3;
int led4=4;
int led5=5;
int led6=16;

// 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(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(led5, OUTPUT);
pinMode(led6, OUTPUT);

digitalWrite(led1, 0);
digitalWrite(led2, 0);
digitalWrite(led3, 0);
digitalWrite(led4, 0);
digitalWrite(led5, 0);
digitalWrite(led6, 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
Serial.println(WiFi.localIP());
}

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 req = client.readStringUntil('\r');
Serial.println(req);
client.flush();

// Match the request
int val;

if (req.indexOf("/gpio/") != -1){
int start = req.indexOf("/gpio/");
int eidx = req.indexOf(" HTTP");
String nval = req.substring(start+6,eidx);

val = nval.toInt();

} else {
val = 0;
// Serial.println("invalid request");
// client.stop();
// return;
}

// Set GPIO2 according to the request
digitalWrite(led1, (((val == 1) !=0))?!digitalRead(led1):digitalRead(led1));
digitalWrite(led2, (((val == 2) !=0))?!digitalRead(led2):digitalRead(led2));
digitalWrite(led3, (((val == 3) !=0))?!digitalRead(led3):digitalRead(led3));
digitalWrite(led4, (((val == 4) !=0))?!digitalRead(led4):digitalRead(led4));
digitalWrite(led5, (((val == 5) !=0))?!digitalRead(led5):digitalRead(led5));
digitalWrite(led6, (((val == 6) !=0))?!digitalRead(led6):digitalRead(led6));
client.flush();

// Prepare the response
String s = "HTTP/1.1 200 OK\r\n";
s += "Access-Control-Allow-Origin:*\r\nAccess-Control-Allow-Methods:POST, GET\r\nAccess-Control-Allow-Headers:AUTHORISED\r\n";
s += "Content-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>";
s += "\r\n<head>";
s += "<style>";
s += "a{";
s += " display:inline-block;text-align:center;height:60px; width:60px; border: black solid 4px;";
s += " font-size:2em; padding:0.6em; border-radius:1.2em;";
s += " magin:0.5em;";
s += "}\r\n";
s += ".on{ background-color:red; }\r\n";
s += ".off{ background-color:white;}\r\n";
s += "</style>";
s+= "\r\n</head>";
s+= "<body>";
s += "<h1>";
s += "<a href=\"/gpio/1\" class=\"" ;
s += digitalRead(led1)?"on":"off";
s += "\">1</a> ";

s += "<a href=\"/gpio/2\" class=\"" ;
s += digitalRead(led2)?"on":"off";
s += "\">2</a> ";

s += "<a href=\"/gpio/3\" class=\"" ;
s += digitalRead(led3)?"on":"off";
s += "\">3</a> ";

s += "<a href=\"/gpio/4\" class=\"" ;
s += digitalRead(led4)?"on":"off";
s += "\">4</a> ";

s += "<a href=\"/gpio/5\" class=\"" ;
s += digitalRead(led5)?"on":"off";
s += "\">5</a> ";

s += "<a href=\"/gpio/6\" class=\"" ;
s += digitalRead(led6)?"on":"off";
s += "\">6</a> ";

s += "</h1>";
s += "\r\nGPIO is now ";
s += (val)?"high":"low";
s += "<br/><br/>[" + req +"]<br/>" + val;
s += "</body>";
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
}

รวมประสบการณ์จากงานสอน และเรื่องที่พบพาน

วันพฤหัสบดีที่ 27 สิงหาคม พ.ศ. 2558

ESP8266 Web Server On-Of Toggle LED

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