• #include <SPI.h>
• #include <UIPEthernet.h>

Thingspeak Setup:

1. Create a ThingSpeak account: Go to ThingSpeak.com and create an account. 

2. Create a new channel: Once you've logged in, click on "Channels" and then click on "New Channel." Give your channel a name and fill out any other relevant fields (e.g. field names, units of measurement, etc.). 

3. Get your ThingSpeak API key: Once you've created your channel, click on "API Keys" and then click on "New API Key." Select "Write" permissions and click "Save." This will generate an API key that you'll use in your Arduino code.  

4. Connect your Ethernet module to your Arduino. Make sure the module is receiving power and connected to the internet.

5. Test out your setup with THingspeak. Write a test Arduino code that will send data to your ThingSpeak channel. See below example: 

   #include <SPI.h> //change the following line to #include <Ethernet.h> to use the ethernet shield #include <UIPEthernet.h> byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };  EthernetClient client; String apiKey = "YOUR_API_KEY"; // replace with your ThingSpeak API key const char* server = "api.thingspeak.com"; void setup() {   Ethernet.begin(mac);   Serial.begin(9600); } void loop() {   float sensorValue = analogRead(A0); // replace with your sensor reading code   Serial.println(sensorValue);   if (client.connect(server, 80)) {     String postStr = apiKey;     postStr += "&field1=";     postStr += String(sensorValue);     postStr += "\r\n";     client.print("POST /update HTTP/1.1\n");     client.print("Host: api.thingspeak.com\n");     client.print("Connection: close\n");     client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");     client.print("Content-Type: application/x-www-form-urlencoded\n");     client.print("Content-Length: ");     client.print(postStr.length());     client.print("\n\n");     client.print(postStr);     Serial.println("Sent data to ThingSpeak");   }   else {     Serial.println("Connection failed");   }   delay(15000); // wait 15 seconds before sending the next data point }

6. Once done uploading the codes you should see the data from thingspeak.

Twilio Setup:

1. Create a Twilio account: Go to https://www.twilio.com/try-twilio and create a new account. 

2. Create a new Twilio phone number: Once you're logged in, go to the Twilio Console and create a new phone number.

3. Obtain your Twilio Account SID and Auth Token: In the Twilio Console, click on the "Settings" icon and then click on "API Keys." Copy your Account SID and Auth Token to a safe location, as you'll need them later in your code.

4. Go back to ThingSpeak and go to "Apps" tab on the upper right and click on "ThingHTTP" and then you are going to create a new "ThingHTTP" and fill up all the information needed. Here are some example of the information that you need to fill up you just need to change the Account SID and Auth Token. 

5. Test out your setup with Twilio. Write a test Arduino code that will send SMS using Twilio. See below example: 
   

   #include <SPI.h> //change the following line to #include <Ethernet.h> to use the eithent shield #include <UIPEthernet.h> // Enter a MAC address for your controller below. byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //thingspeak server char server[] = "api.thingspeak.com"; //if DHCP fails, use a static IP IPAddress ip(192,168,0,177); // Initialize the Ethernet client library EthernetClient client; //API key for the Thingspeak ThingHTTP already configured const String apiKey = "BUEC78IIKJWVTG8W"; //the number the message should be sent to const String sendNumber = "YOUR PHONE NUMBER"; void setup() {   Serial.begin(9600);   //set up Ethernet:   setupEthernet();     //send the sms   Serial.println("Sending SMS");     //this function will send the sms   //the first argument is the number to send to, formatted like this +12345678901   //the second argument is the body of the text message, which must be within URLEncode()   sendSMS(sendNumber, URLEncode("Hello World!")); } void loop() { //You can put your code here on how do you like your program to work!! } void sendSMS(String number,String message) {   // Make a TCP connection to remote host   if (client.connect(server, 80))   {     //should look like this...     //api.thingspeak.com/apps/thinghttp/send_request?api_key={api key}&number={send to number}&message={text body}     client.print("GET /apps/thinghttp/send_request?api_key=");     client.print(apiKey);     client.print("&number=");     client.print(number);     client.print("&message=");     client.print(message);     client.println(" HTTP/1.1");     client.print("Host: ");     client.println(server);     client.println("Connection: close");     client.println();   }   else   {     Serial.println(F("Connection failed"));   }   // Check for a response from the server, and route it   // out the serial port.   while (client.connected())   {     if ( client.available() )     {       char c = client.read();       Serial.print(c);     }         }   Serial.println();   client.stop(); } void setupEthernet() {   Serial.println("Setting up Ethernet...");   // start the Ethernet connection:   if (Ethernet.begin(mac) == 0) {     Serial.println(F("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);   }   Serial.print("My IP address: ");   Serial.println(Ethernet.localIP());   // give the Ethernet shield a second to initialize:   delay(1000); } String URLEncode(const char* msg) {   const char *hex = "0123456789abcdef";   String encodedMsg = "";   while (*msg!='\0'){     if( ('a' <= *msg && *msg <= 'z')       || ('A' <= *msg && *msg <= 'Z')       || ('0' <= *msg && *msg <= '9') ) {       encodedMsg += *msg;     }     else {       encodedMsg += '%';       encodedMsg += hex[*msg >> 4];       encodedMsg += hex[*msg & 15];     }     msg++;   }   return encodedMsg; }

6. Once done uploading the code you should receive a message from Twilio.

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Integrated Source Code: