IOT Project: Home Automation using NodeMcu
Required Equipment:
- NodeMCU
- Relay
- Jumper Wire
- Adapter
- USB Cable
- AC Wire
- Bulb Holder
- Screwp
- Bulb
- 2 Pin Plug
- NodeMCU
- Relay
- Jumper Wire
- Adapter
- USB Cable
- AC Wire
- Bulb Holder
- Screwp
- Bulb
- 2 Pin Plug
Circuit Diagram:
Software install process:
Now download and install a driver CP2102
Now Copy and Paste this CODE in your IDE and upload to NodeMCU:
*******Warning: Please remove all the relay's wire from NodeMCU when uploading code.*******
#include <ESP8266WiFi.h>
WiFiClient client;
WiFiServer server(80);
const char* ssid = "Tenda_4F18B0"; //your wifi name
const char* password = "12345678"; //wifi password
String command =""; // Command received from Android device
// Set Relay Pins
int relay1 = D0;
int relay2 = D1;
void setup()
{
Serial.begin(115200);
pinMode(relay1, OUTPUT);
pinMode(relay2, OUTPUT);
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
connectWiFi();
server.begin();
}
void loop()
{
client = server.available();
if (!client) return;
command = checkClient ();
if (command == "r1on" || command == "light on" || command == "*on")
{
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
Serial.println("Relay1 On");
}
else if (command == "r1off" || command == "light off" || command == "*light off" || command == "off")
{
digitalWrite(relay1,HIGH);
digitalWrite(relay2,HIGH);
Serial.println("Relay1 Off");
}
else
{
digitalWrite(relay1,LOW);
digitalWrite(relay2,LOW);
}
sendBackEcho(command); // send command echo back to android device
command = "";
}
/* connecting WiFi */
void connectWiFi()
{
Serial.println("Connecting to WIFI");
WiFi.begin(ssid, password);
while ((!(WiFi.status() == WL_CONNECTED)))
{
delay(300);
Serial.print("..");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("NodeMCU Local IP is : ");
Serial.print((WiFi.localIP()));
}
/* check command received from Android Device */
String checkClient (void)
{
while(!client.available()) delay(1);
String request = client.readStringUntil('\r');
request.remove(0, 5);
request.remove(request.length()-9,9);
return request;
}
/* send command echo back to android device */
void sendBackEcho(String echo)
{
client.println("HTTP/1.1 200 OK ");
client.println("Content-Type: text/html");
client.println("");
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println(echo);
client.println("</html>");
client.stop();
delay(1);
}
After successfully uploading code then open your serial monitor for knowing IP address:
Change the baud rate of the serial monitor into 115200.
If the serial monitor is also blank then press "RST Button" on your nodemcu
Now your serial monitor looks like this and you can find your ip
Now put on the IP in your app :
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