Allsensing Document Center

Step1. 아두이노 IDE에 Thingspeak 라이브러리 추가

Step2. Wi-Fi ssid, pass 확인 및 변경

• code Thingspeak ssid, password 부분 자신이 사용할 Wi-Fi ssid, pass로 변경

Step3. Thingpeak channelnumber 및 api key 확인

• Thingspeak → channel → my channel → channel setting → channel id 확인 후 code 변경
• Thingspeak → channel → my channel → Api keys → Write Api key → key 확인 후 code 변경

lox_o2_thingspeak.cpp

#include <Arduino.h>
#include "ThingSpeak.h"
#include <Wire.h>
#include <WiFi.h>
const char* Poll_mode = "M 01\r\n";
const char* O2_Read = "%\r\n";
const char* ssid = "your network SSID";   // your network SSID (name) 
const char* password = "your network password";   // your network password
WiFiClient  client;
unsigned long myChannelNumber = your channel number;
const char * myWriteAPIKey = "your channel api key";
// Timer variables
String str;
unsigned long lastTime = 0;
unsigned long timerDelay = 10000;
void setup()
{
Serial.begin(9600);
  WiFi.mode(WIFI_STA);   
  ThingSpeak.begin(client);  // Initialize ThingSpeak
}
void loop()
{
float o2_value_to;
  Serial1.print(O2_Read);
  delay(1000);
   if(Serial1.available()>0) 
   { 
    str = "";
    str = Serial1.readStringUntil('\n'); 
    Serial.println(str);
    int o2_length  = str.length();
    String value_o2 = str.substring(o2_length-6, o2_length);
    o2_value_to = value_o2 .tofloat();
   }
 
    if ((millis() - lastTime) > timerDelay) 
    {
        // Connect or reconnect to WiFi
        if(WiFi.status() != WL_CONNECTED)
        {
        Serial.print("Attempting to connect");
        while(WiFi.status() != WL_CONNECTED){
            WiFi.begin(ssid, password); 
            delay(2000);     
        } 
        Serial.println("\nConnected.");
        }
        // pieces of information in a channel.  Here, we write to field 1.
        ThingSpeak.setField(1, o2_value_to);
        int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
        if(x == 200){
        Serial.println("Channel update successful.");
        }
        else{
        Serial.println("Problem updating channel. HTTP error code " + String(x));
        }
        lastTime = millis();
   }

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