Pemrograman pada Internet of Things (IoT)

 

Pemrograman pada Internet of Things (IoT)

Monitoring suhu dan temperatur berbasis IoT menggunakan arduino dengan modul ESP8266 dan DHT11 :

Gambar Setting Sensor Melalui ThingSpeak

 

Gambar Setting API Key

 

Gambar Skema Rangkaian

 

Program :

#include <stdlib.h>
#include <DHT.h>
#define DHTPIN 5         // DHT data pin connected to Arduino pin 5
#define DHTTYPE DHT11     // DHT11 (DHT Sensor Type )
DHT dht(DHTPIN, DHTTYPE); // Initialize the DHT sensor
#define SSID "WiFi Name"     // "WiFi Name"
#define PASS "WiFi Password"       // "Password"
#define IP "184.106.153.149"// thingspeak.com ip

String msg = "GET /update?key=Your API Key"; //change it with your key...
float temp;
int hum;
String tempC;
int error;
void setup()
{
  Serial.begin(115200); // use default 115200.
  Serial.println("AT");
  delay(5000);

  if (Serial.find("OK")) {
    connectWiFi();
  }
}

void loop() {
start:
  error = 0;
  temp = dht.readTemperature();
  hum = dht.readHumidity();
  char buffer[10];
  tempC = dtostrf(temp, 4, 1, buffer);
  updateTemp();

  if (error == 1) {
    goto start;
  }
  delay(5000);
}

void updateTemp() {
  String cmd = "AT+CIPSTART=\"TCP\",\"";
  cmd += IP;
  cmd += "\",80";
  Serial.println(cmd);
  delay(2000);

  if (Serial.find("Error")) {
    return;
  }

  cmd = msg ;
  cmd += "&field1=";
  cmd += tempC;
  cmd += "&field2=";
  cmd += String(hum);
  cmd += "\r\n";
  Serial.print("AT+CIPSEND=");
  Serial.println(cmd.length());

  if (Serial.find(">")) {
    Serial.print(cmd);
  }

  else {
    Serial.println("AT+CIPCLOSE");
    //Resend...
    error = 1;
  }
}

boolean connectWiFi() {
  Serial.println("AT+CWMODE=1");
  delay(2000);
  String cmd = "AT+CWJAP=\"";
  cmd += SSID;
  cmd += "\",\"";
  cmd += PASS;
  cmd += "\"";

  Serial.println(cmd);
  delay(5000);

  if (Serial.find("OK")) {
    return true;
  } else {
    return false;
  }
}

Mengontrol LED atau Relay menggunakan ESP8266 :

Gambar Skema Kontrol LED atau Relay menggunakan ESP8266

 

Program :

#include <ESP8266WiFi.h>
const char* ssid = "indobot";      // Nama AP/Hotspot
const char* password = "1234567890";    // Password AP/Hotspot
WiFiServer server(80);

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

  pinMode (16, OUTPUT);
  digitalWrite(16, LOW);
  pinMode (14, OUTPUT);
  digitalWrite(14, 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.softAPIP());
}

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();

  // Perintah yang diterima untuk menghidupkan led
  if (req.indexOf("LED1=ON") != -1)
      digitalWrite(16, HIGH);
  else if (req.indexOf("LED1=OFF") != -1)
      digitalWrite(16, LOW);
  else if (req.indexOf("LED2=ON") != -1)
      digitalWrite(14, HIGH);
  else if (req.indexOf("LED2=OFF") != -1)
      digitalWrite(14, LOW);
  else {

    Serial.println("invalid request");
    client.stop();
    return;
  }

  client.flush();
  delay(1);
  Serial.println("Client disconnected");

  // The client will actually be disconnected
  // when the function returns and 'client' object is destroyed
}

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