ON AND OFF ALED USING BHARAT PI BOARD AND TRANSMITING IT TO CLOUND TO SWITCH ON AND OFF THE LED

Blynk Cloud Integration:

1. The code uses Blynk to establish a connection between the ESP32 and the Blynk Cloud.
2. The virtual pin V1 is linked to a button widget in the Blynk app to control the LED state.

WiFi Connection:

1. The ESP32 connects to the internet using your WiFi credentials (ssid and pass).
2. Upon successful connection to WiFi and Blynk Cloud, the device is ready to receive commands.

LED Control:

1. An LED is connected to GPIO 13 (LED_PIN) of the ESP32.
2. When the user toggles the button in the Blynk app, the state of the LED changes accordingly.
3. The code ensures that the LED is turned off initially (digitalWrite(LED_PIN, LOW)).

Button Interaction:

1. The BLYNK_WRITE(V1) function listens for button presses from the Blynk app.
2. The virtual pin V1 sends the button state (0 or 1) to the ESP32, and the LED is controlled based on this input.

Hardware Requirements:

1. ESP32 development board.
2. LED.
3. Resistor

Connections:

1. LED:
2. Long leg (Anode) of the LED → Connect to GPIO 13 of the ESP32 (defined as LED_PIN in the code).
3. Short leg (Cathode) of the LED → Connect to one leg of the resistor.
4. The other leg of the resistor → Connect to GND on the ESP32.
5. WiFi:
6. Ensure your ESP32 is powered and connected to the same WiFi network as configured in the code (ssid and pass).

Connection Table:

LED PinConnects To

Long leg (Anode)

GPIO 13 (LED_PIN)

Short leg (Cathode)

Resistor → GND

Notes:

1. Optional Resistor: If you skip the resistor, the LED might draw too much current, potentially damaging the LED or the ESP32 pin. Use a 220Ω or 330Ω resistor to limit current.
2. GPIO Pin Selection: If GPIO 13 is already in use or inaccessible, change the #define LED_PIN value in the code to an available GPIO pin, and connect the LED accordingly.
3. Power Source: Power the ESP32 via USB or an external 5V power supply.

Testing the Connection:

1. Verify the LED turns ON when the button in the Blynk app is pressed.
2. If the LED doesn’t respond:
3. Check the GPIO pin mapping.
4. Confirm the Blynk app is linked correctly to Virtual Pin V1.
5. Check for loose connections or incorrect polarity of the LED.

#define BLYNK_TEMPLATE_ID "TMPL34yhUAgOe"

#define BLYNK_TEMPLATE_NAME "LED1"

#define BLYNK_AUTH_TOKEN "lQgz0RXOeV8pIQeYC6vvC9SiRhyWLMfL"

#include <WiFi.h>

#include <BlynkSimpleEsp32.h> // Use the Blynk library for ESP32 or Bharat Pi

const char* ssid = "Yogesh"; // Your Wi-Fi SSID

const char* pass = "Yogi5244"; // Your Wi-Fi Password

// Define the GPIO pin where the LED is connected

#define LED_PIN 13

// Define the switch state for controlling the LED

bool ledState = false;

void setup() {

 // Initialize Serial Monitor for debugging

 Serial.begin(115200);

 // Connect to WiFi

 Serial.print("Connecting to WiFi...");

 WiFi.begin(ssid, pass);

 while (WiFi.status() != WL_CONNECTED) {

  delay(1000);

  Serial.print(".");

 }

 Serial.println("\nConnected to WiFi");

 // Initialize the Blynk connection

 Serial.print("Connecting to Blynk...");

 Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

 // Set the LED_PIN as OUTPUT

 pinMode(LED_PIN, OUTPUT);

 digitalWrite(LED_PIN, LOW); // Initialize the LED to be OFF

 Serial.println("Blynk Connected.");

}

// Blynk button widget will control the LED state

BLYNK_WRITE(V1) {

 ledState = param.asInt(); // Get the state of the virtual switch (0 or 1)

 Serial.print("Button State: ");

 Serial.println(ledState); // Debugging: Print the state of the button

 if (ledState == 1) {

  digitalWrite(LED_PIN, HIGH); // Turn the LED ON

  Serial.println("LED is ON");

 } else {

  digitalWrite(LED_PIN, LOW); // Turn the LED OFF

  Serial.println("LED is OFF");

 }

}

void loop() {

 Blynk.run(); // Maintain the Blynk connection

}