Arduino_to_ThingSpeak (Arduino_to_ThingSpeak)

/*https://github.com/iobridge/ThingSpeak-Arduino-Examples/blob/master/Ethernet/Arduino_to_ThingSpeak.ino Arduino –> ThingSpeak Channel via Ethernet The ThingSpeak Client sketch is designed for the Arduino and Ethernet. This sketch updates a channel feed with an analog input reading via the ThingSpeak API (https://thingspeak.com/docs) using HTTP POST. The Arduino uses DHCP and DNS for a simpler network setup. The sketch also includes a Watchdog / Reset function to make sure the

Arduino stays connected and/or regains connectivity after a network outage.

Use the Serial Monitor on the Arduino IDE to see verbose network feedback

and ThingSpeak connectivity status.

Getting Started with ThingSpeak:

* Sign Up for New User Account – https://thingspeak.com/users/new

* Create a new Channel by selecting Channels and then Create New Channel

* Enter the Write API Key in this sketch under “ThingSpeak Settings"

Arduino Requirements:

* Arduino with Ethernet Shield or Arduino Ethernet

* Arduino 1.0+ IDE

Network Requirements:

* Ethernet port on Router

* DHCP enabled on Router

* Unique MAC Address for Arduino

Created: October 17, 2011 by Hans Scharler (http://www.nothans.com)

Additional Credits:

Example sketches from Arduino team, Ethernet by Adrian McEwen

*/

#include <SPI.h>

#include <Ethernet.h>

#include <Wire.h>

#include <BH1750.h>

// Local Network Settings

byte mac[] = {

0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF

};

IPAddress ip(192, 168, 30, 200);

IPAddress dnServer(168, 95, 1, 1);

// the router’s gateway address:

IPAddress gateway(192, 168, 30, 254);

// the subnet:

IPAddress subnet(255, 255, 255, 0);

// ThingSpeak Settings

byte server[] = { 184, 106, 153, 149 }; // IP Address for the ThingSpeak API

String writeAPIKey = “UR42ZTYTE4PBQ8Y2 “; // Write API Key for a ThingSpeak Channel

const int updateInterval = 30000; // Time interval in milliseconds to update ThingSpeak

EthernetClient client ;

// Variable Setup

long lastConnectionTime = 0;

boolean lastConnected = false;

int resetCounter = 0;

// Initialize Arduino Ethernet Client

BH1750 lightMeter;

void updateThingSpeak(String tsData)

{

if (client.connect(server, 80))

{

Serial.println(“Connected to ThingSpeak…");

Serial.println();

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();

resetCounter = 0;

}

else

{

Serial.println(“Connection Failed.");

Serial.println();

resetCounter++;

if (resetCounter >=5 ) {resetEthernetShield();}

lastConnectionTime = millis();

}

}

void resetEthernetShield()

{

Serial.println(“Resetting Ethernet Shield.");

Serial.println();

client.stop();

delay(1000);

Ethernet.begin(mac, ip, gateway, subnet);

delay(1000);

}

void setup()

{

// Start Serial for debugging on the Serial Monitor

Serial.begin(9600);

lightMeter.begin();

// Start Ethernet on Arduino

// start the Ethernet connection:

if (Ethernet.begin(mac) == 0) {

Serial.println(“Failed to configure Ethernet using DHCP");

// no point in carrying on, so do nothing forevermore:

// try to congifure using IP address instead of DHCP:

Ethernet.begin(mac, ip, dnServer, gateway, subnet);

}

// give the Ethernet shield a second to initialize:

delay(1000);

Serial.println(“connecting…");

}

//String analogValue0 = String(lightMeter.readLightLevel(), DEC);

void loop()

{

String analogPin0 = String(analogRead(A0), DEC);

// 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();

}