Reverse Engineering : Belajar IOT kurang dari 1 jam

kali ini saya akan mencontohkan buat anda yang akan membuat sistem IoT (internet of Things) dalam hal ini kita akan bahas menghidupkan dan menyalakan lampu menggunakan smarphone jaraj jauh (dengan internet)

sumber :https://www.electronicwings.com/users/lokeshc/projects/14/control-things-using-amazon-alexa

ok langsung saja cus ....

Peralatan yang di butuhkan :

Board NODEMCU

Relay 5 Volt

Kabel USB

Lihat  video nya : VIDEO HASIL UJI COBA  

berikut ini scripnya :

#include <ESP8266WiFi.h>

#include "Adafruit_MQTT.h"

#include "Adafruit_MQTT_Client.h"

#define Relay1            D1

#define WLAN_SSID       "PPI-24A"             // Your SSID wifi anda

#define WLAN_PASS       "tawakkal17"        // Your password wifi anda

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"

#define AIO_SERVERPORT  1883                   // use 8883 for SSL

#define AIO_USERNAME    "------------"            // ganti dengan username di akun adafruit

#define AIO_KEY         "------------"   // ganti sesui authentikasi akun anda di adafruit

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.

WiFiClient client;

// or... use WiFiFlientSecure for SSL

//WiFiClientSecure client;

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.

Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

// Setup a feed called 'onoff' for subscribing to changes.

Adafruit_MQTT_Subscribe Light1 = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/Relay1"); // FeedName

void MQTT_connect();

void setup() {

  Serial.begin(115200);

  pinMode(Relay1, OUTPUT);

  // Connect to WiFi access point.

  Serial.println(); Serial.println();

  Serial.print("Connecting to ");

  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);

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

    delay(500);

    Serial.print(".");

  }

  Serial.println();

  Serial.println("WiFi connected");

  Serial.println("IP address: "); 

  Serial.println(WiFi.localIP());

  // Setup MQTT subscription for onoff feed.

  mqtt.subscribe(&Light1);

}

void loop() {

  MQTT_connect();

  

  Adafruit_MQTT_Subscribe *subscription;

  while ((subscription = mqtt.readSubscription(20000))) {

    if (subscription == &Light1) {

      Serial.print(F("Got: "));

      Serial.println((char *)Light1.lastread);

      int Light1_State = atoi((char *)Light1.lastread);

      digitalWrite(Relay1, Light1_State);

      

    }

  }

}

void MQTT_connect() {

  int8_t ret;

  // Stop if already connected.

  if (mqtt.connected()) {

    return;

  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;

  

  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected

    Serial.println(mqtt.connectErrorString(ret));

    Serial.println("Retrying MQTT connection in 5 seconds...");

    mqtt.disconnect();

    delay(5000);  // wait 5 seconds

    retries--;

    if (retries == 0) {

      // basically die and wait for WDT to reset me

      while (1);

    }

  }

  Serial.println("MQTT Connected!");

  

}

sumber code : https://www.electronicwings.com/users/lokeshc/projects/14/control-things-using-amazon-alexa