WiFi(Wireless Fidelity)
지난 시간에 이어 WiDo를 사용해 http://www.dfrobot.com/wiki/index.php/Wido-WIFI_IoT_Node_SKU:DFR0321 위 사이트의 튜토리얼 진행.
Tutorial 3
Step.1
Xively를 사용해 cloud 신호를 받아오자
- xively.com 해당사이트 가입 및 새로운 device 만듬
- device 클릭.
- 아두이노 라이브러리에 포함된 "Wido2Xively" 예제코드를 열고, (2)번의 디바이스 정보에 따라 아래부분 수정
#define WEBSITE "api.xively.com"
#define API_key "Nm8vxZaYtkCreW9oBL74VIxY93ONHsvNlpizj6QkIM8hxxxx" // Check your API Key from device page
#define feedID "180220xxxx" // Check your feedID
샘플코드 (전체)
/***************************************************
* This is an example for the DFRobot Wido - Wifi Integrated IoT lite sensor and control node
*
* Designed specifically to work with the DFRobot Wido products:
*
*
* The main library is forked from Adafruit
*
* Written by Lauren
* BSD license, all text above must be included in any redistribution
*
****************************************************/
/*
This example code is used to connect the Xively cloud service.
The device required is just:
1. LM35 low cost temperature sensor or any device you used to upload data
2. And Wido
*/
#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#define Wido_IRQ 7
#define Wido_VBAT 5
#define Wido_CS 10
Adafruit_CC3000 Wido = Adafruit_CC3000(Wido_CS, Wido_IRQ, Wido_VBAT,
SPI_CLOCK_DIVIDER); // you can change this clock speed
#define WLAN_SSID "myNetwork" // cannot be longer than 32 characters!
#define WLAN_PASS "myPassword"
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY WLAN_SEC_WPA2
#define IDLE_TIMEOUT_MS 2000
#define TCP_TIMEOUT 3000
#define WEBSITE "api.xively.com"
#define API_key "Nm8vxZaYtkCreW9oBL74VIxY93ONHsvNlpizj6QkIM8hxxxx" // Update Your API Key
#define feedID "180220xxxx" // Update Your own feedID
void setup(){
Serial.begin(115200);
Serial.println(F("Hello, CC3000!\n"));
/* Initialise the module */
Serial.println(F("\nInitialising the CC3000 ..."));
if (!Wido.begin())
{
Serial.println(F("Unable to initialise the CC3000! Check your wiring?"));
while(1);
}
/* Attempt to connect to an access point */
char *ssid = WLAN_SSID; /* Max 32 chars */
Serial.print(F("\nAttempting to connect to "));
Serial.println(ssid);
/* NOTE: Secure connections are not available in 'Tiny' mode!
By default connectToAP will retry indefinitely, however you can pass an
optional maximum number of retries (greater than zero) as the fourth parameter.
*/
if (!Wido.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
Serial.println(F("Failed!"));
while(1);
}
Serial.println(F("Connected!"));
/* Wait for DHCP to complete */
Serial.println(F("Request DHCP"));
while (!Wido.checkDHCP())
{
delay(100); // ToDo: Insert a DHCP timeout!
}
}
uint32_t ip = 0; // Store Xively ip address
float temp = 0; // Store temporary sensor data for post
void loop(){
static Adafruit_CC3000_Client WidoClient;
static unsigned long RetryMillis = 0; // timer stamp for building the connection
static unsigned long uploadtStamp = 0; // timer stamp for posting data to service
static unsigned long sensortStamp = 0; // timer stamp for reading data to LM35
// Apply for the connection with the cloud service
if(!WidoClient.connected() && millis() - RetryMillis > TCP_TIMEOUT){
// Update the time stamp
RetryMillis = millis();
Serial.println(F("Try to connect the cloud server"));
//Get Xively IOT Server IP
ip = Wido.IP2U32(216,52,233,120);
WidoClient = Wido.connectTCP(ip, 80);
}
// After building the connection with the service
// Post the sensor data to Xively
if(WidoClient.connected() && millis() - uploadtStamp > 2000){
uploadtStamp = millis();
// If the device is connected to the cloud server, upload the data every 2000ms.
// Prepare JSON for Xively & get length
int length = 0;
// JSON beginning
String data_start = "";
data_start = data_start + "\n"
+ "{\"version\":\"1.0.0\",\"datastreams\" : [ ";
// JSON for temperature & humidity
String data_temperature = "{\"id\" : \"Temperature\",\"current_value\" : \""
+ String(int(temp)) + "\"}]}";
// Get length
length = data_start.length() + data_temperature.length();
Serial.println(F("Connected to Xively server."));
// Send headers
Serial.print(F("Sending headers"));
WidoClient.fastrprint(F("PUT /v2/feeds/"));
WidoClient.fastrprint(feedID);
WidoClient.fastrprintln(F(".json HTTP/1.0"));
Serial.print(F("."));
WidoClient.fastrprintln(F("Host: api.xively.com"));
Serial.print(F("."));
WidoClient.fastrprint(F("X-ApiKey: "));
WidoClient.fastrprintln(API_key);
Serial.print(F("."));
WidoClient.fastrprint(F("Content-Length: "));
WidoClient.println(length);
Serial.print(F("."));
WidoClient.fastrprint(F("Connection: close"));
Serial.println(F(" done."));
// Send data
Serial.print(F("Sending data"));
WidoClient.fastrprintln(F(""));
WidoClient.print(data_start);
Serial.print(F("."));
WidoClient.print(data_temperature);
Serial.print(F("."));
WidoClient.fastrprintln(F(""));
Serial.println(F(" done."));
/* Get the http page info
Serial.println(F("Reading answer..."));
while (WidoClient.connected()) {
while (WidoClient.available()) {
char c = WidoClient.read();
Serial.print(c);
}
}
*/
delay(1000); // Wait for 1s to finish posting the data stream
WidoClient.close(); // Close the service connection
RetryMillis = millis(); // Reset the timer stamp for applying the connection with the service
}
//Realtime update the latest sensor data from LM35 once per 100ms and convert the unit (degree)
if(millis() - sensortStamp > 100){
sensortStamp = millis();
// read the LM35 sensor value and convert to the degrees every 100ms.
int reading = analogRead(0);
temp = reading *0.0048828125*100;
Serial.print(F("Real Time Temp: "));
Serial.println(temp);
}
}
- Wido에 업로드. 요청 로그를 디바이스 페이지에서 확인 가능.
Step.2 CC3000의 Adafruit 라이브러리를 사용해 WG1300 이용할거야!
프로그램 공간을 절약하기위한 트릭.
#define CC3000_TINY_DRIVER위 코드는 작은 드라이버 역할.
모듈 초기화
if (!cc3000.begin())
{
Serial.println(F("Unable to initialise the CC3000! Check your wiring?"));
while(1);
}
- 라우터 연결 설정
if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) { Serial.println(F("Failed!")); while(1); } - DHCO 정보를 얻는다!
while (!cc3000.checkDHCP()) { delay(100); // ToDo: Insert a DHCP timeout! }