Creating an LED control from web browser program
Required Components
- Node MCU Board -1 no
- Bread Board -1 no
- Data Cable -1 no
- LED -1 no
Circuit
Steps
- Make sure the components are working properly.
- Connect Node MCU Board to the Bread Board.
- Connect the LED Anode(+) pin to Node MCU D7(13) and cathode(-)pin to Gnd.
- Check the Arduino program.
- Check the Circuit Connections.
- Run the Arduino program.
Arduino Program
#include <ESP8266WiFi.h>
const char* ssid = "******";
const char* password = "********";
int ledPin = 13; // GPIO13
WiFiServer server(80);
void setup()
{
Serial.begin(115200);
delay(10);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
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");
server.begin();
Serial.println("Server started");
Serial.print("Use this URL to connect: ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop()
{
WiFiClient client = server.available();
if (!client)
{
return;
}
Serial.println("new client");
while(!client.available()){
delay(1);
}
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
int value = LOW;
if (request.indexOf("/LED=ON") != -1) {
digitalWrite(ledPin, HIGH);
value = HIGH;
}
if (request.indexOf("/LED=OFF") != -1) {
digitalWrite(ledPin, LOW);
value = LOW;
}
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("Led pin is now: ");
if(value == HIGH) {
client.print("On");
}
else {
client.print("Off");
}
client.println("<br><br>");
client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>");
client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br/>");
client.println("</html>");
delay(1);
Serial.println("Client disonnected");
Serial.println("");
}
Usage
- Prototyping
of IoT devices
- Low
power battery operated applications
- Network
