How to collect and analyze sensing data of IoT platform

This post shows how to connect IoT platform to Cloud service and how to display sensing data for graphical analysis.
* Scope of post
* Platform : WIZwiki-W7500
* cloud data loger : (
* cloud chart :
* IDE; Web-Compiler(
* HTTP Query

  • What is Phant?
    • Phant is a open source cloud server platform by powered Sparkfun Electronics.
    • Sparkfun created ,which is a free cloud service running phant. –
    • To collect data from your device to cloud service, you just need to register a new stream.
    • After register, you get two keys for accessing the data; one is q private key is required to update that stream, other is a public key grants access to any other stream on the service.
    • All communication with Phant is carried out over HTTP. So, your device should be acted as HTTP Client.

  • Phant :

    Phant is a modular node.js based data logging tool for collecting data from the Internet of Things. It is the open source software that powers, and is actively maintained by SparkFun Electronics. Phant is short for elephant. Elephants are known for their remarkable recall ability, so it seemed appropriate to name a data logging project in honor of an animal that never forgets.

  • 3rd party of
  • Graphing front end
    > is a full stack IoT web service and hardware platforms where people can create connected devices and share them with the world. It is designed to solve all kinds of world problems from air pollution, improving farm output or studying the bee population. It is really only limited by the users imagination. (for more detail)

Prepare materials

  • Hardware

    • mbed platform : WIZwiki-W7500
      • ARM® Cortex™-M0 Core 48MHz
      • 128KB Flash memory
      • 16KB to 48 KB SRAM (Min 16KB available if 32KB socket buffer is used, Max 48KB available if no socket buffer is used)
      • Hardwired TCP/IP Core (8 Sockets, MII: Medium-Independent Interface)
      • 12-bit, 8ch ADC
      • 53 I/Os
      • 1ch Watchdog, 4ch Timers and 8ch PWM
      • 3ch UART
      • 2ch SPI
      • 2ch I2C
    • Sensors (ywrobot easy module shield v1): DHT11

  • Registrations

      To create a data stream, head over to, and click “CREATE”.


* Used Lib
* WIZnetInterface Lib. : for Ethernet connectivity of W7500
* DHT Lib. : for DHT11 sensor

Codes flow

 *Input Pins, Misc
 * D4 - Temp. and Hum. Sensor
 * D3 - Push buttom
DHT sensor(D4, DHT11);
DigitalIn  triggerPin(D3);
  • Configuration Phat Stuff
 * Phant Stuffs
 * Insert your publicKey
 * Insert your privateKey
 * Generat Fileds; 'Files name shoud be same "field name" in Create Stream form'
char publicKey[] = "insert_your_publicKey";
char privateKey[] = "insert_your_privateKey";
uint8_t NUM_FIELDS = 2;
char fieldNames1[] = "hum";
char fieldNames2[] = "temp";
  • Network Configuration : DHCP Client
   // Enter a MAC address for your controller below.
    uint8_t mac_addr[6] = {0x00, 0x08, 0xDC, 0x00, 0x01, 0x02};     

    printf("initializing Ethernetrn");
    // initializing MAC address

    // Check Ethenret Link
    if( == true)   printf("- Ethernet PHY Link-Done rn");
    else printf("- Ethernet PHY Link- Failrn");

    // Start Ethernet connecting: Trying to get an IP address using DHCP
    if (eth.connect()<0)    printf("Fail - Ethernet Connecing");

    // Print your local IP address:
  • HTTP Client
 *  - If the trigger pin (3) goes low, send the data.
 *      - Get sensing datas by using analogread()
 *      - Call postData
 *          - Open socket as TCP Client
 *          - Try to connet TCP server (; if needs, do DNS clinet for getting IP address of server
 *          - Make query string based on Phant frame
 *          - Send query
 *          - Check for a response from the server, and route it out the serial port.

        if(triggerPin ==0)
            c   = sensor.ReadTemperature(CELCIUS);
            h   = sensor.ReadHumidity();
           printf("Temperature in Celcius: %4.2f", c);
           printf("Humidity is %4.2fn", h, dp, dpf);

          sock.connect("", 80);

          snprintf(http_cmd, http_cmd_sz,  "GET /input/%s?private_key=%s&%s=%2.2f&%s=%3.3f HTTP/1.1rnHost: data.sparkfun.comrnConection: closernrn", 
                                            publicKey, privateKey, fieldNames1, h, fieldNames2, c);
          sock.send_all(http_cmd, http_cmd_sz-1);

          while ( (returnCode = sock.receive(buffer, buffer_sz-1)) > 0)
              buffer[returnCode] = '';
              printf("Received %d chars from server:nr%sn", returnCode, buffer);




Serial Monitor

  1. DHCP Clinet message
  2. Press the button to send query to server.
  3. Confirm the response message on serial terminal and
    initializing Ethernet
    - Ethernet PHY Link-Done
    Temperature in Celcius: 27.00Humidity is 55.00
    Received 299 chars from server:
    HTTP/1.1 200 OK
    Access-Control-Allow-Origin: *
    Access-Control-Allow-Methods: GET,POST,DELETE
    Access-Control-Allow-Headers: X-Requested-With, Phant-Private-Key
    Content-Type: text/plain
    X-Rate-Limit-Limit: 300
    X-Rate-Limit-Remaining: 298
    X-Rate-Limit-Reset: 1441353380.898
    Date: Fri, 04 Sep 20
    Received 299 chars from server:
    15 07:46:03 GMT
    Transfer-Encoding: chunked
    Set-Cookie: SERVERID=phantworker2; path=/
    Cache-control: private

2015-09-04_16-39-51// import stream from

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devcenter overwiew



Telefónica launches Lego-like blocks for the Internet of Things

최근 IoT의 동향을 잘 보여주는 동영상 한편! #IoT에 많은 트렌드가 있겠지만 #Cloud 친화적이 제일 끌린다. 서비스의 이해도 쉽고

Atmel | Bits & Pieces

Telefónica has launched what it describes as the first Internet of Things (IoT) product enabling consumers to connect just about any device wirelessly to the web. The new product, dubbed ‘Thinking Things,’ is a simple plug-and-play solution based on Lego-like modules with 2G connectivity that allow Makers to develop their own smart solutions without any programming know-how or having to install an additional infrastructure.

The first Thinking Things pack to be marketed by the company is an ambient kit pack, a set of modules that enables users to remotely monitor in real-time the temperature, humidity and light intensity of a given place, and to program automated tasks. According to the company, an additional host of modules such as presence, pressure, humidity and temperature sensors, impact meters, audio and LED notifications, and timers can be added as well.

Telefónica specified that the modules can be pieced together by simply fitting them on top…

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