JSON 통신(Arduino/Wifi shield)

# JSON 통신 (Arduino/Wifi shield)

1. What is it

IoT 기반 '스마트 주문기'라는 프로젝트 구현 중 사용했던 Arduino, Wifi shield 기반 JSON 통신 소스

2. Summary

아두이노와 아두이노 와이파이쉴드를 이용하여 JSON 통신으로 서버와 데이터 통신

H/W(아두이노, 아두이노 와이파이쉴드)에 장착된 버튼을 누르면 POST방식으로 서버에 데이터 요청

웹서버는 /insertOrder, /completeOrder 으로 상황에 따른 작업 수행 

3. Info

- Source 상 서버 주소 : 117.16.231.212:8010

- LED 동작 로직 : 

*No.1 LED ON- 

 : 프로그램 시작과 동시에 LED ON(손님 착석, But 주문 하지 않은 상태)

 No.1 LED OFF - 

 : 메뉴A,B,C중 버튼 하나라도 누르면 첫번째 LED OFF

*No.2 LED ON - 

 : 주문 중 / 주문 완료 일 때 LED ON

 No.2 LED OFF - 

 : 서빙을 완료했을 때 LED OFF

Source)

#include <SPI.h>
#include <WiFi.h>
 
//LED pin
//프로그램 시작과 동시에 LED ON ( 손님 착석, But 주문 하지 않은 상태 )
//->메뉴A,B,C중 버튼 하나라도 누르면 첫번째 LED OFF
int ledPin09 = 9;
int ledPin10 = 10;
int ledPin11 = 11;
//button for confirm the order
int currentButtonState;  //input selected buttonPin
int buttonPin2 = 2;      //menu A
int buttonPin3 = 3;      //menu B
int buttonPin4 = 4;      //menu C
int buttonPin5 = 5;      //Complete Order
int buttonPin6 = 6;      //Complete Serving(사용자가 주문한 음식이 테이블에 도착했을 때)
 
 
char ssid[] = "U+village";       //  your network SSID (name) 
char pass[] = "lguplus100";   // your network password
 
int status = WL_IDLE_STATUS;
char servername[]="117.16.231.212";  
// == IPAddress servernaeme(117,16,231,212);  
 WiFiClient client;
 
void setup() {
  
  //LED Section
  pinMode(ledPin09, OUTPUT);
  pinMode(ledPin10, OUTPUT);
  pinMode(ledPin11, OUTPUT);
 
  //Button Section
  pinMode(buttonPin2, INPUT); //Pin 2
  pinMode(buttonPin3, INPUT); //Pin 3
  pinMode(buttonPin4, INPUT); //Pin 4
  pinMode(buttonPin5, INPUT); //Pin 5
  pinMode(buttonPin6, INPUT); //Pin 6
  
   Serial.begin(9600);
   Serial.println("Attempting to connect to WPA2 network...");
   Serial.print("SSID: ");
   Serial.println(ssid);
 
   status = WiFi.begin(ssid, pass);
   Serial.println("Connected to wifi");
   Serial.println("\nStarting connection...");
     
  if (client.connect(servername, 8010)) {
  Serial.println("= = = YAHA Project Start = = =");    //Connected
  digitalWrite(ledPin09, 1);
  }
  digitalWrite(ledPin10, 0);
}
 
void loop() {
  
  String data,complete;
  int buttonPin_2 = digitalRead(buttonPin2);
  int buttonPin_3 = digitalRead(buttonPin3);
  int buttonPin_4 = digitalRead(buttonPin4);
  int buttonPin_5 = digitalRead(buttonPin5);
  int buttonPin_6 = digitalRead(buttonPin6);
  
   if(buttonPin_2){
   currentButtonState = 2;
   }
   if(buttonPin_3){
     currentButtonState = 3;
   }
   if(buttonPin_4){
     currentButtonState = 4;
   }
   //Complete Order
   if(buttonPin_5){
     complete+="no=66";
     client.println("POST /completeOrder HTTP/1.1");
     client.println("Host: 117.16.231.212:8010");
     client.println("Content-Type: application/x-www-form-urlencoded");
     client.print("Content-Length: ");
     client.println(complete.length());
     client.println();
     client.print(complete);
     client.println();
 
     Serial.println("Complete Order of Order-Number 66 ");
   }
   //Complete Serving
   if(buttonPin_6){
     digitalWrite(ledPin10, 0);
     Serial.println("Complete Serving");
   }
 
  switch(currentButtonState){
    case 2:
    data+="menu=A&tableName=1";
    client.println("POST /insertOrder HTTP/1.1");
    client.println("Host: 117.16.231.212:8010");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.print("Content-Length: ");
    client.println(data.length());
    client.println();
    client.print(data);
    client.println();
    Serial.println("Order Menu A");
    digitalWrite(ledPin09, 0);
    
    
    buttonPin_2=0;
    currentButtonState=0;
    break;
    case 3:
    data+="menu=B&tableName=1";
    client.println("POST /insertOrder HTTP/1.1");
    client.println("Host: 117.16.231.212:8010");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.print("Content-Length: ");
    client.println(data.length());
    client.println();
    client.print(data);
    client.println();
    Serial.println("Order Menu B");
    digitalWrite(ledPin09, 0);
    
    buttonPin_3=0;
    currentButtonState=0;
    break;
    case 4:
    data+="menu=C&tableName=1";
    client.println("POST /insertOrder HTTP/1.1");
    client.println("Host: 117.16.231.212:8010");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.print("Content-Length: ");
    client.println(data.length());
    client.println();
    client.print(data);
    client.println();
    Serial.println("Order Menu C");
    digitalWrite(ledPin09, 0);
    
    buttonPin_4=0;
    currentButtonState=0;
    break;
  }
 
}