IOT Talking to Webserver - how to
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The document outlines a project to connect an Arduino Uno to a web server via WiFi using the ESP8266 module to demonstrate IoT functionality affordably. It details the necessary components, connection setup instructions, and programming code to facilitate communication between the Arduino and the server. The author concludes that this prototype can be expanded for more advanced applications, such as controlling appliances remotely.
IOT Talking to Webserver - how to
- 1. IOT - How to talk to Webserver from arduino By Indraneel Ganguli
- 2. Introduction There has been a lot of talk on IOT (Internet of things) and how its going to be the next big thing. Devices connected to the internet and talking to each other . This fascinated me. I thought of embarking on a small mission of finding out and implementing a small scale project which touches on IOT. Also I didn't wanted to spend too much money on this project and wanted a cheap way of building something which will demonstrated IOT working. Started searching on Amazon.in to find something cheap.
- 3. The problem statement (created one) The problem statement i created for this project is that i need have a device talk to a webserver over WIFI and do some action.
- 4. Need to build stuff cheaply After a bit of research on Google , found that one can use Arduino UNO for the device (cost - Rs 450 /$6). Arduino UNO doesn't have inbuilt WIFI capability . One needs to add Arduino WIFI Sheild to Arduino to make it WIFI enable. Arduino WIFI shield is expensive Rs 6000 (~$90). I wanted a cheap alternative . Found ESP8266 Serial WIFI module (cost Rs 210 /$3). The only caveat is that integrating ESP8266 with Arduino UNO is bit of hardwork and challenge ( which i could overcome after slogging for 2 days) Stuff needed to build one
- 5. Inventory 1. Arduino UNO - http://www.amazon.in/Development-Board-ATmega328P-ATmega16U2- Arduino/dp/B00H1HR576/ref=sr_1_1?ie=UTF8&qid=1453694450&sr=8-1&keywords=arduino+uno Rs 450/$6 2 ESP8266 - http://www.amazon.in/ESP8266-Serial-Wireless-Transceiver- Module/dp/B00O34AGSU/ref=sr_1_1?ie=UTF8&qid=1453693968&sr=8-1&keywords=esp8266 - Rs 210 ($3) 3. Breadboard , jumper wires . etc .
- 6. Connection Setup 1.One needs to connect Arduino UNO with ESP8266 . ESP8266 has the following connections
- 7. Connection Setup (contd ..) 2. Connect Arduino PIN 2 to TX of ESP8266 and Arduino PIN 3 to RX of ESP8266 3. Connect 3.3 V pin of Arduino to Vcc of ESP8266 4. Connect 3.3 V pin tof Arduino to CH_PD of ESP 8266 6 Connect GND pin of Arduino to GND ping of ESP8266.
- 8. How would it look after connection.
- 9. Install Arduino IDE on Mac /PC / or Linux One need to install Arduino IDE https://www.arduino.cc/en/Main/Software Connect USB from Arduino to your PC . You would see power on lights on Arduino. Install ESP Library into Arduino IDE Go to Tools-> Library -> Manage Libraries , in the search box type ESP8266.
- 10. The program code (aka sketch) #include <SoftwareSerial.h> #define DEBUG true SoftwareSerial esp8266(2,3); // make RX Arduino line is pin 2, make TX Arduino line is pin 3. // This means that you need to connect the TX line from the esp to the Arduino's pin 2 // and the RX line from the esp to the Arduino's pin 3 void setup() { } // contd to next page
- 11. The program code (contd..) void loop() { Serial.begin(115200); esp8266.begin(115200); // your esp's baud rate might be different sendData("AT+RSTrn",2000,DEBUG); // reset module sendData("AT+CWMODE=1rn",3000,DEBUG); // configure as access point sendData("AT+CWJAP="WIFISSID"","WIFIPASSWORD"rn",3000,DEBUG); sendData("AT+CIFSRrn",3000,DEBUG); // get ip address Serial.println("Start of operation") ; //sendData("AT+CIPSTART="TCP","x.x.x.x",yrn",3000,DEBUG); sendData("AT+CIPSTART="TCP","192.168.0.102",8080rn",3000,DEBUG); sendData("AT+CIPSEND=72rn",3000,DEBUG); String sendcommand = "GET http://x.x.x.x/someURL HTTP/1.0rnrnrn"; //works for most cases Serial.print(sendcommand.length()); String resp=sendData(sendcommand,5000,DEBUG);
- 12. The program code (contd..) Serial.println("http response start") ; Serial.println(resp); Serial.println("http response stop") ; sendData("AT+CIPCLOSErn",10000,DEBUG) ; Serial.println("completed operation") ; delay(30000) ; } String sendData(String command, const int timeout, boolean debug) { String response = ""; esp8266.print(command); // send the read character to the esp8266 long int time = millis();
- 13. The program code (contd..) while( (time+timeout) > millis()) { while(esp8266.available()) { // The esp has data so display its output to the serial window char c = esp8266.read(); // read the next character. response+=c; } } if(debug) { Serial.print(response); } return response; }
- 14. Conclusion This prototype shows on the arduino can talk to webserver over wifi . One can extend this basic working to advance level like switching on LED , FANS , motors controlled. Since I have set arduino as web client , it can connect to public ip (without natting etc).