In this tutorial, we'll show you how to control an LED connected to your Bharat Pi board using the Blynk app. Blynk is a platform that allows you to build IoT projects easily and control hardware remotely from your smartphone.

Supplies

Bharat Pi board

Usb cable

Blynk app installed on your smartphone

Step 1: Bharat Pi

Bharat Pi boards come equipped with built-in LEDs, removing the need for any external LED connections.

Step 2: Blynk App

Step 3: Get Your Auth Token

Step 4: Add a Button Widget

Tap on the '+' button to add a widget.

Select the 'Button' widget.

Tap on the button to configure it.

Set the output pin to the pin corresponding to the onboard LED of the Bharat Pi board.

Step 5: Writing the Bharat Pi Cod

Install Blynk Library:

If not already installed, install the Blynk library.

Write the Code:

#define BLYNK_TEMPLATE_ID "TMPL3qtqAe6AN" // Add your actual Template ID here
#define BLYNK_TEMPLATE_NAME "led"
#define BLYNK_AUTH_TOKEN "ZGMM0nHLso1Xwq8FMrbuo35wE59z0CFB"
#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "smile123";
char pass[] = "123456789";

int LED = 2; // Define LED as an Integer and use pin 2 on the ESP32

void setup() {
 // Debug console
 Serial.begin(115200);
 pinMode(LED, OUTPUT); // Set the LED (pin 2) as an output
 Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

void loop() {
 Blynk.run();
}

// This function will be called every time button Widget
// in Blynk app writes values to the Virtual Pin V3
BLYNK_WRITE(V3) {
 int pinValue = param.asInt(); // Assigning incoming value from pin V3 to a variable
 if (pinValue == 1) {
  digitalWrite(LED, HIGH); // Turn LED on
 } else {
  digitalWrite(LED, LOW); // Turn LED off
 }
}

Replace "YourAuthToken" and #define BLYNK_TEMPLATE_ID "TMPL3qtqAe6AN"

with the Auth Token you received from Blynk.

Upload the Code and Connect

Upload the Code:

Connect your Bharat Pi board to your computer using a USB cable.
Select the correct board and port from the Arduino IDE.
Upload the code to your Bharat Pi.

Open the Serial Monitor:

After the code is uploaded, open the Serial Monitor from the Arduino IDE.
Set the baud rate to 9600.

Connect the Blynk App:

Ensure your phone and Bharat Pi are connected.
Press the play button on the Blynk app to start the project.

Test Your Setup

Control the Onboard LED:

Tap the button in the Blynk app to turn the onboard LED of the Bharat Pi on and off.
If everything is set up correctly, the onboard LED should blink when you press the button.

Introduction: How to Blink an LED Using the Blynk App