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In this program,
LED connected to Arduino Mega board is controlled (Toggled) using TalkBack Application from https://thingspeak.com server (cloud).
ESP01 WiFi Module is used to connect to the Internet and send data to https://thingspeak.com server
The output is shown using LED & Serial Monitor on PC.
Note:
TalkBack application is the feature in which,
we can store some commands on thinkspeak server and then we can call those commands using API.
When we trigger particular API, we receive some command as a response and then we can control the output device (Eg. LED) as per received response from the cloud.
Apart from that, we can also add, delete and Change the commands using APIs
Recommended Internet of Things (IOT) Courses:
- Udemy: Complete Guide to Build IOT Things from Scratch to Market
- LinkedIn: IoT Foundations: Fundamentals
- edX: Introduction to the Internet of Things (IoT)
- edureka: IoT Certification Training on Azure
- Coursera: An Introduction to Programming the Internet of Things (IOT) Specialization
- Eduonix: Internet Of Things (IOT) Bundle
Physical Connections:
Steps:
- Sign up at https://thingspeak.com
- Apps > TalkBalk > New TalkBack > Update "Name" > Click on "Add a new Command"
update position=1, command string=LED_ON > Click on "Add a new Command"
update position=2, command string=LED_OFF" > Save TalkBalk - Copy following things and replace those in the below program:
a. API_Key
b. TalkBack_ID
c. Command_ID (For LED_ON)
d. Command_ID (For LED_OFF) - Make all the Connections to Arduino Mega board mentioned Above.
- Change Following 6 fields in below written program.
a. ssid_name (Name of you WiFi)
b. password (Passord of your WiFi)
c. API_Key
d. TalkBack_ID
e. Command_ID
FORMAT:
https://api.thingspeak.com/talkbacks/<TalkBack_ID>/commands/<COMMAND_ID>?api_key=<API_Key>
Replace <TalkBack_ID>, <Command_ID> and <API_Key> by actual values
(you got from step 3.a, 3.b, 3.c or 3.d respectively)
- Upload Program to Arduino Mega Board
- Open Arduino Serial Monitor on PC (Set Baud Rate to 9600 and set "Both NL & CR")
Program Outcome:
LED connected to Pin 13 should Blink with a specific interval.
Observe the connection to the thinkspeak server and received msgs using Serial monitor.
For Better understanding you can watch the demonstration video given below:
LED connected to Pin 13 should Blink with a specific interval.
Observe the connection to the thinkspeak server and received msgs using Serial monitor.
For Better understanding you can watch the demonstration video given below:
Downloads:
Download link is given in the Description of the YouTube video shown below.
Demonstration:
Program:
int led=13; void setup() { Serial.begin(9600); // PC Arduino Serial Monitor Serial1.begin(115200); // Arduino to ESP01 Communication // RXD - TX1, TXD - RX1 pinMode(led,OUTPUT); // Set ledPin as Output digitalWrite(led,LOW); // LED OFF delay(100); // wait for 100 mSec connectWiFi(); // To connect to Wifi } void loop() { //////////////////////// START: LED_ON TALKBAK //////////////////////////// Serial1.println("AT+CIPMUX=0\r\n"); // Set MUX=0 delay(1000); // wait for 1 Sec // TCP connection String cmd = "AT+CIPSTART=\"TCP\",\""; // TCP connection with https://thingspeak.com server cmd += "184.106.153.149"; // api.thingspeak.com cmd += "\",80\r\n\r\n"; // Port No. = 80 Serial1.println(cmd); // Send above command to Rx1, Tx1 delay(1000); // wait for 1 Sec if(Serial1.find("ERROR")) // If returns error in TCP Connection { Serial.println("AT+CIPSTART error"); // Display error msg to PC return; } // prepare GET string // Replace <TalkBack_ID>, <Command_ID> and <API_Key> by actual values here String getStr = "GET /talkbacks/20941/commands/10327032?api_key=CLMIBI9XMK35YJWQ\r\n\r\n"; //LED_ON Get a TalkBack Command // send data length cmd = "AT+CIPSEND="; cmd += String(getStr.length()); cmd+="\r\n"; Serial1.println(cmd); // Send Data length command to Tx1, Rx1 delay(100); // wait for 0.1 Sec if(Serial1.find(">")) // If prompt opens //verify connection with cloud { Serial.println("Request Sent"); // Display confirmation msg to PC Serial1.print(getStr); // Send GET String to Rx1, Tx1 } else { Serial1.println("AT+CIPCLOSE"); // Send Close Connection command to Rx1, Tx1 // alert user Serial.println("Closing Connection"); // Display Connection closed command on PC } delay(5000); // wait for 5 Sec String recd=""; // Received String if(Serial1.available()>0) // Check Buffer { delay(1000); // wait for 1 Sec while(Serial1.available()) // Till Buffer is not Empty { recd+=(char(Serial1.read())); // Read the Buffer } Serial.println("____________"); // Display msg to PC Serial.println("Response: "); // Display msg to PC Serial.print(recd); // Display Received msg to PC } if(find_text("LED_ON",recd)==1) // Check if LED_ON msg received digitalWrite(led,HIGH); // LED ON //////////////////////// END: LED_ON TALKBAK //////////////////////////// //////////////////////// START: LED_OFF TALKBAK //////////////////////////// Serial1.println("AT+CIPMUX=0\r\n"); // Set MUX=0 delay(1000); // wait for 1 Sec // TCP connection cmd = "AT+CIPSTART=\"TCP\",\""; // TCP connection with https://thingspeak.com server cmd += "184.106.153.149"; // api.thingspeak.com cmd += "\",80\r\n\r\n"; // Port No. = 80 Serial1.println(cmd); // Send above command to Rx1, Tx1 delay(1000); // wait for 1 Sec if(Serial1.find("ERROR")) // If returns error in TCP Connection { Serial.println("AT+CIPSTART error"); // Display error msg to PC return; } // prepare GET string // Replace <TalkBack_ID>, <Command_ID> and <API_Key> by actual values here getStr = "GET /talkbacks/20941/commands/10327039?api_key=CLMIBI9XMK35YJWQ\r\n\r\n"; //LED_OFF Get a TalkBack Command // send data length cmd = "AT+CIPSEND="; cmd += String(getStr.length()); cmd+="\r\n"; Serial1.println(cmd); // Send Data length command to Tx1, Rx1 delay(100); // wait for 0.1 Sec if(Serial1.find(">")) // If prompt opens //verify connection with cloud { Serial.println("Request Sent"); // Display confirmation msg to PC Serial1.print(getStr); // Send GET String to Rx1, Tx1 } else { Serial1.println("AT+CIPCLOSE"); // Send Close Connection command to Rx1, Tx1 // alert user Serial.println("Closing Connection"); // Display Connection closed command on PC } delay(5000); // wait for 5 Sec recd=""; // Received String if(Serial1.available()>0) // Check Buffer { delay(1000); // wait for 1 Sec while(Serial1.available()) // Till Buffer is not Empty { recd+=(char(Serial1.read())); // Read the Buffer } Serial.println("____________"); // Display msg to PC Serial.println("Response: "); // Display msg to PC Serial.print(recd); // Display Received msg to PC } if(find_text("LED_OFF",recd)==1) // Check if LED_OFF msg received digitalWrite(led,LOW); // LED OFF //////////////////////// END: LED_OFF TALKBAK //////////////////////////// delay(5000); } int find_text(String sr, String recd) //function to serach a Substring in Received msg { int foundpos = -1; for (int i = 0; (i < recd.length() - sr.length()); i++) { if (recd.substring(i,sr.length()+i) == sr) { foundpos = 1; } } return foundpos; } boolean connectWiFi() { // Connect to Wifi Function Serial1.println("AT+CWMODE=1\r\n"); // Setting Mode = 1 delay(100); // wait for 100 mSec String cmd = "AT+CWJAP=\""; // Connect to WiFi cmd += "SuiteUp"; // Replace ssid_name here cmd += "\",\""; cmd += "welcome@10"; // Replace password here cmd += "\"\r\n"; Serial.println(cmd); // Display Connect Wifi Command on PC Serial1.println(cmd); // send Connect WiFi command to Rx1, Tx1 delay(10000); // wait for 10 sec Serial1.println("AT+CWJAP?"); // Verify Connected WiFi if(Serial1.find("+CWJAP")) { Serial.println("OK, Connected to WiFi."); // Display Confirmation msg on PC return true; } else { Serial.println("Can not connect to the WiFi."); // Display Error msg on PC return false; } }
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Thanks and Regards,
-Akshay P. Daga