Thingspeak basic code

Projects Programming
1

Please tell me why we wrote failedCounter++ two times in the basic Thingspeak code?

{
failedCounter++;

Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")");
Serial.println();
}

}
else
{
failedCounter++;

Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")");
Serial.println();

lastConnectionTime = millis();
}

2

Because you did.

3

The devil made you do it?

Paul

4

Please post your full sketch. If possible you should always post code directly in the forum thread as text using code tags (</> button on the toolbar). This will make it easy for anyone to look at it, which will increase the likelihood of you getting help. If the sketch is longer than the forum will allow then it's ok to add it as an attachment. Don't put your code in some external file service like dropbox, etc. We shouldn't need to go to an external website just to help you. I do feel it's reasonable to post a link to code hosted on GitHub or similar code hosting sites since that's an platform specifically designed for this sort of thing

Please always do a Tools > Auto Format on your code before posting it. This will make it easier for you to spot bugs and make it easier for us to read. If you're using the Arduino Web Editor then you will not have access to this useful tool. I recommend using the standard Arduino IDE instead.

5

Please tell me why we wrote failedCounter++ two times in the basic Thingspeak code?

#include <SPI.h>
#include <Ethernet.h>

int pin = 0; // analog pin
int tempc = 0,tempf=0; // temperature variables
int samples[8]; // variables to make a better precision
int maxi = -100,mini = 100; // to start max/min temperature
int i;

// Local Network Settings
byte mac[]     = { 0xD4, 0xA8, 0xE2, 0xFE, 0xA0, 0xA1 }; // Must be unique on local network
byte ip[]      = { 192,168,0,150 };                // Must be unique on local network
byte gateway[] = { 192,168,0,1};
byte subnet[]  = { 255, 255, 255, 0 };

// ThingSpeak Settings
char thingSpeakAddress[] = "api.thingspeak.com";
String writeAPIKey = "QGBA1G3872XSHBAC";    // Write API Key for a ThingSpeak Channel
const int updateInterval = 10000;        // Time interval in milliseconds to update ThingSpeak   

// Variable Setup
long lastConnectionTime = 0; 
boolean lastConnected = false;
int failedCounter = 0;

// Initialize Arduino Ethernet Client
EthernetClient client;

void setup()
{

  Serial.begin(9600);
  Ethernet.begin(mac, ip, gateway, subnet);
  delay(1000);
  Serial.print("ETHERNET SHIELD ip  is     : ");
  Serial.println(Ethernet.localIP()); 
   // Start Ethernet on Arduino
  startEthernet();
}

void loop()
{
  
  tempc = ( 5.0 * analogRead(pin) * 100.0) / 1024.0;

  String analogPin0 = String(tempc);
  
  // Print Update Response to Serial Monitor
  if (client.available())
  {
    char c = client.read();
    Serial.print(c);
  }
  
  // Disconnect from ThingSpeak
  if (!client.connected() && lastConnected)
  {
    Serial.println();
    Serial.println("...disconnected.");
    Serial.println();
    
    client.stop();
  }
  
  // Update ThingSpeak
  if(!client.connected() && (millis() - lastConnectionTime > updateInterval))
  {
    updateThingSpeak("field1="+analogPin0);
  }
  
  lastConnected = client.connected();
}

void updateThingSpeak(String tsData)
{
  if (client.connect(thingSpeakAddress, 80))
  { 
    client.print("POST /update HTTP/1.1\n");
    client.print("Host: api.thingspeak.com\n");
    client.print("Connection: close\n");
    client.print("X-THINGSPEAKAPIKEY: "+writeAPIKey+"\n");
    client.print("Content-Type: application/x-www-form-urlencoded\n");
    client.print("Content-Length: ");
    client.print(tsData.length());
    client.print("\n\n");

    client.print(tsData);
    
    lastConnectionTime = millis();
    
    if (client.connected())
    {
      Serial.println("Connecting to ThingSpeak...");
      Serial.println();
      
      failedCounter = 0;
    }
    else
    {
      failedCounter++;
  
      Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")");   
      Serial.println();
    }
    
  }
  else
  {
    failedCounter++;
    
    Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")");   
    Serial.println();
    
    lastConnectionTime = millis(); 
  }
}

void startEthernet()
{
  
  client.stop();

  Serial.println("Connecting Arduino to network...");
  Serial.println();  

  delay(1000);
  
  // Connect to network amd obtain an IP address using DHCP
  if (Ethernet.begin(mac) == 0)
  {
    Serial.println("DHCP Failed, reset Arduino to try again");
    Serial.println();
  }
  else {
    Serial.println("Arduino connected to network using DHCP");
    Serial.println();
    Serial.println("Data being uploaded to THINGSPEAK Server.......");
    Serial.println();
  }
  
  delay(1000);
}
6

DON'T CROSS POST!!!!!!!!!!!!!!!!!!!!
http://forum.arduino.cc/index.php?topic=544227
I HAVE REPORTED THIS THREAD TO THE MODERATORS

7

Threads merged.