Overview of the Series

Warnings:

• Not that simple, it is full stack.
• IoT Not necessarily required
• Think on your feet
• Lots of Holes
• Think of the problem at hand

Good Things:

• Get a feel of complete Stack
• Learn a lot
• Be able to make a decision
• Build something cool

The IoT Architecure

The Devices

The Connectivity

The Cloud and the Internet

We have the Data? Now what

Concrete Examples

Example 1

A simple IOT demo with Explore ESP8266

#include <DHT.h>
#include <Wire.h>
#include <ESP8266WiFi.h>
#include "font.h"
#define offset 0x00    // SDD1306                      // offset=0 for SSD1306 controller
//#define offset 0x02    // SH1106                       // offset=2 for SH1106 controller
#define OLED_address  0x3c

String apiKey = "things_speak_api_key";
char ssid[20] = "wifi ssid";
char password[20] = "wifi password";

char TempValue[15];
String str;

const char* server = "api.thingspeak.com";
#define DHTPIN 5 // what pin we're connected to
DHT dht(DHTPIN, DHT11,15);

WiFiClient client;

void setup() {
  Serial.begin(115200);             // for debugging
  Wire.begin(0,2);                                // Initialize I2C and OLED Display
  init_OLED();                                    
  reset_display();
  clear_display();
  delay(10);

  sendStrXY("Connecting to ",0,0);
  sendStrXY(ssid, 3, 0);
  // Setup the Internet
  WiFi.begin(ssid, password);
  int pos  = 0;
  while (WiFi.status() != WL_CONNECTED) {

    delay(500);
    pos++;
    sendStrXY(".", 5, pos);
  }

  sendStrXY("connected", 5, 0);
  clear_display();
  delay(100); 
  
  //Setup the display Screen
  sendStrXY("Explore Embedded" ,0,0);
  sendStrXY("Temp:",3,0);
  sendStrXY("Humidity:",4,0);
  sendStrXY("InternetOfThings",7,0);
  
}

//String TempValue;

void loop() {

       float h = dht.readHumidity();
       float t = dht.readTemperature();
       char tvalue[5], hvalue[5];
       if (isnan(h) || isnan(t)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
      }

    
         str = String(t);
         str.toCharArray(tvalue,15); 
         sendStrXY(tvalue,3,10);

         str = String(h);
         str.toCharArray(hvalue,15); 
         sendStrXY(hvalue,4,10);

         if (client.connect(server,80)) {  //   "184.106.153.149" or api.thingspeak.com
              String postStr = apiKey;
                     postStr +="&field1=";
                     postStr += String(t);
                     postStr +="&field2=";
                     postStr += String(h);
                     postStr += "\r\n\r\n";
           
               client.print("POST /update HTTP/1.1\n"); 
               client.print("Host: api.thingspeak.com\n"); 
               client.print("Connection: close\n"); 
               client.print("X-THINGSPEAKAPIKEY: "+apiKey+"\n"); 
               client.print("Content-Type: application/x-www-form-urlencoded\n"); 
               client.print("Content-Length: "); 
               client.print(postStr.length()); 
               client.print("\n\n"); 
               client.print(postStr);
                     
           
               Serial.print("Temperature: ");
               Serial.print(t);
               Serial.print(" degrees Celcius Humidity: "); 
               Serial.print(h);
               Serial.println("% send to Thingspeak");    
            }
            client.stop();
             
            Serial.println("Waiting...");    
            // thingspeak needs minimum 15 sec delay between updates
            delay(20000);  
     

}

Example 2: Air Quality Egg

Resources

• Design files
• Wiki

Example 3: Starling

Resources

• Design files
• Wiki

Explore IoT Kit

IoT the Hackers way

How?

Low cost stuff!

ESP8266

Custom Cloud