ESP8266 Arduino IDE - Dual Communication ESP8266 Button LED

Pada artikel sebelumnya kita pernah membahas mengenai komunikasi client server antara dua esp8266 yang saling terhubung satu sama lain dan memberikan sebuah output data yang dikirimkan dari client ke server (Baca juga : ESP8266 Arduino IDE – Client Server Communication).

Nah pada tutorial kali ini kita akan membahas lebih lanjut tentang komunikasi dua esp8266. Hasil dari percobaan kali ini kita akan coba untuk mengirimkan data yang dihasilkan dari switch yang terhubung ke esp8266 client (station mode) untuk menghidupkan led yang terhubung ke esp8266 server (hotspot mode).

Skema rangkaian dapat dilihat seperti dibawah ini.

Berikut kode program ESP8266 Client :

#include <ESP8266WiFi.h>
#Define button 5

const char* ssid = "warriornux.com";       // Nama SSID AP/Hotspot
const char* password = "1234567890";       // Password Wifi

IPAddress host(192,168,4,1);       // IP Server

int buttonstate = 0;

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

  pinMode(button, INPUT);
  
// Connect to WiFi network ------------------------------------------------
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

// Mengatur WiFi ----------------------------------------------------------
  WiFi.mode(WIFI_STA);                      // Mode Station
  WiFi.begin(ssid, password);               // Mencocokan SSID dan Password
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

// Print status Connect ---------------------------------------------------
  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop(){
  buttonstate = digitalRead(button);

  const char* url;
  if (buttonstate == HIGH) {
    url="ledoff";
  }
  else {
    url="ledon";
  }

int value = 0;

  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  
  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");
}

#include <ESP8266WiFi.h>

#Define button 5

const char* ssid = "warriornux.com"; // Nama SSID AP/Hotspot

const char* password = "1234567890"; // Password Wifi

IPAddress host(192,168,4,1); // IP Server

int buttonstate = 0;

void setup() {

Serial.begin(115200);

delay(10);

pinMode(button, INPUT);

// Connect to WiFi network ------------------------------------------------

Serial.println();

Serial.print("Connecting to ");

Serial.println(ssid);

// Mengatur WiFi ----------------------------------------------------------

WiFi.mode(WIFI_STA); // Mode Station

WiFi.begin(ssid, password); // Mencocokan SSID dan Password

while (WiFi.status() != WL_CONNECTED) {

delay(500);

Serial.print(".");

}

// Print status Connect ---------------------------------------------------

Serial.println("");

Serial.println("WiFi connected");

Serial.println("IP address: ");

Serial.println(WiFi.localIP());

}

void loop(){

buttonstate = digitalRead(button);

const char* url;

if (buttonstate == HIGH) {

url="ledoff";

}

else {

url="ledon";

}

int value = 0;

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

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");

}

Berikut kode program ESP8266 Server :

#include <ESP8266WiFi.h>
#define LED 14

const char* ssid = "warriornux.com";      // Nama AP/Hotspot
const char* password = "1234567890";    // Password AP/Hotspot

WiFiServer server(80);
void setup() {
  Serial.begin(115200);
  delay(10);

  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
   
 // Mengatur WiFi ----------------------------------------------------------
  Serial.println();
  Serial.print("Configuring access point...");
   
  WiFi.mode(WIFI_AP);             // Mode AP/Hotspot
  WiFi.softAP(ssid, password);
  
 // Start the server -------------------------------------------------------
  server.begin();
  Serial.println("Server dijalankan");
  
 // 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();
  
   //Command LED -------------------------------------------------------------
    if (req.indexOf("ledon") != -1){
      digitalWrite(LED, HIGH);
    }
   else if (req.indexOf("ledoff") != -1){
      digitalWrite(LED, LOW);
    }
   else {
     Serial.println("invalid request");
     client.stop();
     return;
    }
  
   client.flush();
   Serial.println("Client disonnected");
  
  // The client will actually be disconnected 
  // when the function returns and 'client' object is detroyed
}

#include <ESP8266WiFi.h>

#define LED 14

const char* ssid = "warriornux.com"; // Nama AP/Hotspot

const char* password = "1234567890"; // Password AP/Hotspot

WiFiServer server(80);

void setup() {

Serial.begin(115200);

delay(10);

pinMode(LED, OUTPUT);

digitalWrite(LED, LOW);

// Mengatur WiFi ----------------------------------------------------------

Serial.println();

Serial.print("Configuring access point...");

WiFi.mode(WIFI_AP); // Mode AP/Hotspot

WiFi.softAP(ssid, password);

// Start the server -------------------------------------------------------

server.begin();

Serial.println("Server dijalankan");

// 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();

//Command LED -------------------------------------------------------------

if (req.indexOf("ledon") != -1){

digitalWrite(LED, HIGH);

}

else if (req.indexOf("ledoff") != -1){

digitalWrite(LED, LOW);

}

else {

Serial.println("invalid request");

client.stop();

return;

}

client.flush();

Serial.println("Client disonnected");

// The client will actually be disconnected

// when the function returns and 'client' object is detroyed

}

Penjelasan : Ketika button pada esp8266 client ditekan, maka client tersebut akan mengirimkan data ledon kepada esp8266 server, sehingga nantinya led pada esp8266 server akan hidup. Akan tetapi apabila button tidak ditekan, maka esp8266 client akan mengirim data berupa ledoff.

Berikut video demonya :

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