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ESP32

ESP32BeginnerIntermediateesp32bluetooth-classicwireless-control

ESP32 Bluetooth Classic LED Control

Control an LED wirelessly using ESP32 Bluetooth Classic and a mobile application without Wi-Fi or internet.

₹3698.00

Inclusive of all taxes

Development fee₹1179.00

Components (from library)₹2519.00

Total per unit (incl. GST)₹3698.00

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Quantity:

Total: ₹3698.00

₹3698.00

Inclusive of all taxes

Components

7 items

Difficulty

Intermediate

Build Time

30 – 50 minutes

Project Details

This project demonstrates how to use Bluetooth Classic communication to control hardware devices wirelessly. The ESP32 pairs with a smartphone using Bluetooth Classic, and commands sent from a mobile application are received by the ESP32 to turn an LED ON or OFF. Bluetooth Classic is ideal for offline IoT control as it requires no internet connection, offers easy pairing with smartphones, and provides stable communication. This project is commonly used in home automation, industrial machine control, robotics, and smart gadgets.

How It Works

The ESP32 uses Bluetooth Classic to establish a serial connection with a smartphone. The BluetoothSerial library initializes a Bluetooth device named 'ESP32_BT_LED'. When the mobile app sends a character ('1' for ON, '0' for OFF), the ESP32 reads it via SerialBT.available() and controls GPIO 2 accordingly. The LED state changes based on the received command, and the ESP32 sends confirmation messages back to the mobile app.

Prerequisites

Basic knowledge of Arduino programming, understanding of digital I/O operations, familiarity with Bluetooth concepts, and experience with basic electronics (LEDs, resistors).

What You'll Learn

Bluetooth Classic communication

Understanding how to establish and maintain Bluetooth Classic connections

ESP32 serial data handling

Learning to read and process serial data from Bluetooth

Mobile-to-microcontroller control

Implementing wireless control from a smartphone to embedded hardware

Wireless embedded system design

Designing systems that operate without Wi-Fi or internet

Offline IoT solutions

Creating IoT applications that work in offline environments

Key Features

✓

No Wi-Fi Required

Operates completely offline without internet connection

✓

Simple Mobile Control

Easy-to-use interface for controlling LED via smartphone

✓

Stable Bluetooth Connection

Reliable communication with typical range of 10-20 meters

✓

Extendable Design

Can be expanded to control relays, motors, and other devices

What's Included in the Kit

ESP32 Bluetooth Classic LED Control - All components

Component	Part ID	Qty	Price	Description
ESP32 Development Board	-	1	₹1682.00	-
LED	-	1	₹400.00	-
Resistor (220Ω – 330Ω)	-	1	₹0.00	-
Breadboard	-	1	₹77.00	-
Jumper Wires	-	1	₹171.00	-
USB Cable	-	1	₹190.00	-
Android Smartphone	-	1	₹0.00	-

Pin Connections

MCU Pin	Connected To	Purpose	Notes
GPIO 2	LED Anode (+)	Digital output for LED control	LED cathode connected via resistor to GND
GND	LED Cathode (-) via resistor	Ground connection for LED circuit	220Ω-330Ω resistor required

Tools Required

Laptop / PC

USB Cable

Breadboard

Jumper Wires

Android Smartphone

Safety Precautions

Electrical

⚠Use resistor with LED to prevent damage
⚠Avoid short circuits while wiring

Handling

⚠Disconnect power while making wiring changes
⚠Pair only with trusted devices

Operating

⚠Keep within Bluetooth range (10-20 meters)
⚠Ensure stable power supply to ESP32

Frequently Asked Questions

Q:What is Bluetooth Classic?

A: It is a traditional Bluetooth communication protocol used for serial data transfer, ideal for offline IoT control without Wi-Fi.

Q:Can iOS be used?

A: Bluetooth Classic is limited on iOS devices. Android smartphones are recommended for this project.

Q:What is the communication range?

A: Typically 10–20 meters, depending on environmental factors and device capabilities.

Q:Can I control multiple devices?

A: Yes, by adding more commands and expanding the code to handle multiple outputs or devices.

#esp32#bluetooth-classic#wireless-control#iot#embedded-systems#mobile-control

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