Automate your house hold appliances with this simple tutorial. With open source softwares and components available in plenty , create your own creative DIY‘s.
The tutorial provides you with step by step process of creating android app and controlling home appliances over internet using ESP8266 wifi chip.
While going through this tutorial a little familiarity with Arduino is required. The programming code is be written for ESP8266 wifi chip using Arduino IDE, for which installation of ESP8266 library is required. Click here to setup library for ESP.
Inthis tutorial NodeMCU V1.0 has been used, which is ESP8266 breakout board with usb-ttl option. This provides for easy connection to your PC and arduino IDE. If you are connecting Node MCU board for the first time you would require usb drivers. These drivers could be download by clicking here.
Step 1:
After Connecting Node MCU(Multi-point Control unit) to PC , open Arduino IDE, set com port and choose NODE MCU 1.0 from board as circled in the image below.
Board and Port Selection Fig. 1 Board and Port Selection
Step 2:
Copy the below code to IDE.
/*
* This sketch demonstrates how to set up a simple HTTP-like server.
* The server will set a GPIO pin depending on the request
* http://server_ip/gpio/0 will set the GPIO2 low,
* http://server_ip/gpio/1 will set the GPIO2 high
* server_ip is the IP address of the ESP8266 module, will be
* printed to Serial when the module is connected.
*/
#include <ESP8266WiFi.h>
constchar*ssid=“myHomeWifiName”;
constchar*password=“MyWifiPassword”;
// Create an instance of the server
// specify the port to listen on as an argument
WiFiServerserver(80);
voidsetup(){
Serial.begin(115200);
delay(10);
// prepare GPIO2
pinMode(2,OUTPUT);
digitalWrite(2,0);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print(“Connecting to “);
Serial.println(ssid);
WiFi.begin(ssid,password);
while(WiFi.status()!=WL_CONNECTED){
delay(500);
Serial.print(“.”);
}
Serial.println(“”);
Serial.println(“WiFi connected”);
// Start the server
server.begin();
Serial.println(“Server started”);
// Print the IP address
Serial.println(WiFi.localIP());
}
voidloop(){
// Check if a client has connected
WiFiClientclient=server.available();
if(!client){
return;
}
// Wait until the client sends some data
Serial.println(“new client”);
while(!client.available()){
delay(1);
}
// Read the first line of the request
Stringreq=client.readStringUntil(‘\r’);
Serial.println(req);
client.flush();
// Match the request
intval;
if(req.indexOf(“/gpio/0”)!=–1)
val=0;
elseif(req.indexOf(“/gpio/1”)!=–1)
val=1;
else{
Serial.println(“invalid request”);
client.stop();
return;
}
// Set GPIO2 according to the request
digitalWrite(2,val);
client.flush();
// Prepare the response
Strings=“HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now “;
s+=(val)?“high”:“low”;
s+=“</html>\n”;
// Send the response to the client
client.print(s);
delay(1);
Serial.println(“Client disonnected”);
// The client will actually be disconnected
// when the function returns and ‘client’ object is detroyed
}
Step 3:
In the above code mention the wifi network SSID and Password as shown below:
const char* ssid = “You WIFI SSID Name”;
const char* password = “your wifi password”;
Step 4:
Compile and Upload code to Node MCU(Multi-point Control unit) and this brings us to the end of coding part.
Step 5:
Now, Open Serial Terminal of Arduino IDE and press reset button on ESP8266. Now it will connect to your wifi network and show you an IP address in terminal.
Step 6:
Go to your browser enter URL like below
http://YourESP8266IPAddress/gpio/0 will set the GPIO2 low,
http://YourESP8266IPAddress/gpio/1 will set the GPIO2 High,
You can observe that the Node MCU(Multi-point Control unit) LED toggles between on and off when you press the above URL.
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:79:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const __FlashStringHelper*’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:80:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const String&’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:81:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const char*’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:82:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘char’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:83:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘unsigned char’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:84:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:85:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘unsigned int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:86:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘long int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:87:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘long unsigned int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:88:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘double’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:89:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const Printable&’
showing error
Arduino: 1.6.9 (Windows 7), Board: “NodeMCU 1.0 (ESP-12E Module), 80 MHz, 115200, 4M (3M SPIFFS)”
Warning: Board arduino:avr:fio doesn’t define a ‘build.board’ preference. Auto-set to: AVR_FIO
Warning: Board arduino:avr:pro328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_PRO328
Warning: Board arduino:avr:atmega328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_ATMEGA328
Warning: Board arduino:avr:bt doesn’t define a ‘build.board’ preference. Auto-set to: AVR_BT
Warning: Board arduino:avr:mega doesn’t define a ‘build.board’ preference. Auto-set to: AVR_MEGA
Warning: Board arduino:avr:pro5v doesn’t define a ‘build.board’ preference. Auto-set to: AVR_PRO5V
Warning: Board arduino:avr:atmega8 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_ATMEGA8
Warning: Board arduino:avr:bt328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_BT328
Warning: Board arduino:avr:diecimila doesn’t define a ‘build.board’ preference. Auto-set to: AVR_DIECIMILA
Warning: Board arduino:avr:atmega168 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_ATMEGA168
Warning: Board arduino:avr:leonardo doesn’t define a ‘build.board’ preference. Auto-set to: AVR_LEONARDO
Warning: Board arduino:avr:uno328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_UNO328
Warning: Board arduino:avr:uno doesn’t define a ‘build.board’ preference. Auto-set to: AVR_UNO
Warning: Board arduino:avr:mini328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_MINI328
Warning: Board arduino:avr:mega2560 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_MEGA2560
Warning: Board arduino:avr:nano328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_NANO328
Warning: Board arduino:avr:lilypad328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_LILYPAD328
Warning: Board arduino:avr:pro doesn’t define a ‘build.board’ preference. Auto-set to: AVR_PRO
Warning: Board arduino:avr:nano doesn’t define a ‘build.board’ preference. Auto-set to: AVR_NANO
Warning: Board arduino:avr:pro5v328 doesn’t define a ‘build.board’ preference. Auto-set to: AVR_PRO5V328
Warning: Board arduino:avr:mini doesn’t define a ‘build.board’ preference. Auto-set to: AVR_MINI
Warning: Board arduino:avr:ethernet doesn’t define a ‘build.board’ preference. Auto-set to: AVR_ETHERNET
Warning: Board arduino:avr:lilypad doesn’t define a ‘build.board’ preference. Auto-set to: AVR_LILYPAD
Blink:12: error: stray ‘\223’ in program
const char* ssid = “myHomeWifiName”;
^
Blink:12: error: stray ‘\224’ in program
Blink:13: error: stray ‘\223’ in program
const char* password = “MyWifiPassword”;
^
Blink:13: error: stray ‘\224’ in program
Blink:30: error: stray ‘\223’ in program
Serial.print(“Connecting to “);
^
Blink:30: error: stray ‘\223’ in program
Blink:37: error: stray ‘\223’ in program
Serial.print(“.”);
^
Blink:37: error: stray ‘\224’ in program
Blink:39: error: stray ‘\223’ in program
Serial.println(“”);
^
Blink:39: error: stray ‘\224’ in program
Blink:40: error: stray ‘\223’ in program
Serial.println(“WiFi connected”);
^
Blink:40: error: stray ‘\224’ in program
Blink:44: error: stray ‘\223’ in program
Serial.println(“Server started”);
^
Blink:44: error: stray ‘\224’ in program
Blink:58: error: stray ‘\223’ in program
Serial.println(“new client”);
^
Blink:58: error: stray ‘\224’ in program
Blink:64: error: stray ‘\221’ in program
String req = client.readStringUntil(‘\r’);
^
Blink:64: error: stray ‘\’ in program
Blink:64: error: stray ‘\222’ in program
Blink:70: error: stray ‘\223’ in program
if (req.indexOf(“/gpio/0”) != –1)
^
Blink:70: error: stray ‘\224’ in program
Blink:70: error: stray ‘\226’ in program
Blink:72: error: stray ‘\223’ in program
else if (req.indexOf(“/gpio/1”) != –1)
^
Blink:72: error: stray ‘\224’ in program
Blink:72: error: stray ‘\226’ in program
Blink:75: error: stray ‘\223’ in program
Serial.println(“invalid request”);
^
Blink:75: error: stray ‘\224’ in program
Blink:86: error: stray ‘\223’ in program
String s = “HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n\r\n\r\nGPIO is now “;
^
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\’ in program
Blink:86: error: stray ‘\223’ in program
Blink:87: error: stray ‘\223’ in program
s += (val)?“high”:“low”;
^
Blink:87: error: stray ‘\224’ in program
Blink:87: error: stray ‘\223’ in program
Blink:87: error: stray ‘\224’ in program
Blink:88: error: stray ‘\223’ in program
s += “\n”;
^
Blink:88: error: stray ‘\’ in program
Blink:88: error: stray ‘\224’ in program
Blink:12: error: ‘myHomeWifiName’ was not declared in this scope
const char* ssid = “myHomeWifiName”;
^
Blink:13: error: ‘MyWifiPassword’ was not declared in this scope
const char* password = “MyWifiPassword”;
^
C:\Users\SHAFIQUE\AppData\Local\Temp\arduino_modified_sketch_876674\Blink.ino: In function ‘void setup()’:
Blink:30: error: ‘Connecting’ was not declared in this scope
Serial.print(“Connecting to “);
^
Blink:37: error: expected primary-expression before ‘.’ token
Serial.print(“.”);
^
Blink:37: error: expected unqualified-id before ‘)’ token
Serial.print(“.”);
^
Blink:40: error: expected ‘)’ before ‘connected’
Serial.println(“WiFi connected”);
^
Blink:40: error: no matching function for call to ‘HardwareSerial::println(ESP8266WiFiClass&)’
Serial.println(“WiFi connected”);
^
C:\Users\SHAFIQUE\AppData\Local\Temp\arduino_modified_sketch_876674\Blink.ino:40:34: note: candidates are:
In file included from C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Stream.h:26:0,
from C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/HardwareSerial.h:31,
from C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Arduino.h:245,
from sketch\Blink.ino.cpp:1:
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:79:16: note: size_t Print::println(const __FlashStringHelper*)
size_t println(const __FlashStringHelper *);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:79:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const __FlashStringHelper*’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:80:16: note: size_t Print::println(const String&)
size_t println(const String &s);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:80:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const String&’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:81:16: note: size_t Print::println(const char*)
size_t println(const char[]);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:81:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const char*’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:82:16: note: size_t Print::println(char)
size_t println(char);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:82:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘char’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:83:16: note: size_t Print::println(unsigned char, int)
size_t println(unsigned char, int = DEC);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:83:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘unsigned char’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:84:16: note: size_t Print::println(int, int)
size_t println(int, int = DEC);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:84:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:85:16: note: size_t Print::println(unsigned int, int)
size_t println(unsigned int, int = DEC);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:85:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘unsigned int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:86:16: note: size_t Print::println(long int, int)
size_t println(long, int = DEC);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:86:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘long int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:87:16: note: size_t Print::println(long unsigned int, int)
size_t println(unsigned long, int = DEC);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:87:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘long unsigned int’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:88:16: note: size_t Print::println(double, int)
size_t println(double, int = 2);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:88:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘double’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:89:16: note: size_t Print::println(const Printable&)
size_t println(const Printable&);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:89:16: note: no known conversion for argument 1 from ‘ESP8266WiFiClass’ to ‘const Printable&’
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:90:16: note: size_t Print::println()
size_t println(void);
^
C:\Users\SHAFIQUE\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.3.0\cores\esp8266/Print.h:90:16: note: candidate expects 0 arguments, 1 provided
Blink:44: error: expected primary-expression before ‘started’
Serial.println(“Server started”);
^
C:\Users\SHAFIQUE\AppData\Local\Temp\arduino_modified_sketch_876674\Blink.ino: In function ‘void loop()’:
Blink:58: error: expected type-specifier before ‘client’
Serial.println(“new client”);
^
Blink:64: error: ‘r’ was not declared in this scope
String req = client.readStringUntil(‘\r’);
^
Blink:70: error: expected primary-expression before ‘/’ token
if (req.indexOf(“/gpio/0”) != –1)
^
Blink:70: error: ‘gpio’ was not declared in this scope
if (req.indexOf(“/gpio/0”) != –1)
^
Blink:72: error: expected primary-expression before ‘/’ token
else if (req.indexOf(“/gpio/1”) != –1)
^
Blink:75: error: ‘invalid’ was not declared in this scope
Serial.println(“invalid request”);
^
Blink:86: error: ‘HTTP’ was not declared in this scope
String s = “HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n\r\n\r\nGPIO is now “;
^
Blink:87: error: ‘high’ was not declared in this scope
s += (val)?“high”:“low”;
^
Blink:87: error: ‘low’ was not declared in this scope
s += (val)?“high”:“low”;
^
Blink:88: error: expected primary-expression before ‘<' token
s += “\n”;
^
Blink:88: error: expected primary-expression before ‘/’ token
s += “\n”;
^
Blink:88: error: ‘html’ was not declared in this scope
s += “\n”;
^
Blink:88: error: ‘n’ was not declared in this scope
s += “\n”;
^
exit status 1
stray ‘\223’ in program
This report would have more information with
“Show verbose output during compilation”
option enabled in File -> Preferences.