Bluetooth Controlled Servo motor project | Arduino servo mot

Bluetooth Controlled Servo motor project | Arduino servo motor project

For controlling the position of the servo motor remotely using Bluetooth we use the MIT app inventor to make a wireless remote. In our app, we can set the position of the shaft of the servo using a slider and also with three buttons (0, 90, and 180)

Bluetooth Controlled Servo Motor Using Arduino – A Smart Project

Servo motors are widely used in robotics, automation, and electronics projects due to their precision and controlled movement. In this project, we’ll explore how to control a servo motor wirelessly using Bluetooth and an Arduino board. This setup is perfect for beginners looking to learn about wireless communication, mobile control, and servo motor operation.

Project Overview

The core idea of this project is to use a Bluetooth module (HC-05) to communicate between a smartphone and an Arduino UNO. The servo motor is connected to the Arduino and responds to commands sent from a smartphone app like Bluetooth Terminal or Arduino Bluetooth Controller. With this setup, you can rotate the servo to specific angles with simple keypresses or slider controls from your mobile device.

Components Required

To build this project, you’ll need:

Arduino UNO

• Arduino UNO

HC-05 Bluetooth module

• HC-05 Bluetooth module

Servo motor (SG90 or MG996R)

• Servo motor (SG90 or MG996R)

Jumper wires

• Jumper wires

Breadboard (optional)

• Breadboard (optional)

Power source (USB or battery pack)

• Power source (USB or battery pack)

Smartphone with a Bluetooth control app

• Smartphone with a Bluetooth control app

Circuit Connections

Here’s how to wire the components:

HC-05 Bluetooth Module

VCC → 5V on Arduino

• VCC → 5V on Arduino

GND → GND

• GND → GND

TX → RX (Pin 0)

• TX → RX (Pin 0)

RX → TX (Pin 1) (Use a voltage divider or 1K/2K resistors if needed to protect HC-05)

• RX → TX (Pin 1) (Use a voltage divider or 1K/2K resistors if needed to protect HC-05)

Servo Motor

Red wire → 5V

• Red wire → 5V

Brown/black wire → GND

• Brown/black wire → GND

Orange/yellow wire → Digital pin 9 (PWM pin)

• Orange/yellow wire → Digital pin 9 (PWM pin)

Make sure to disconnect the Bluetooth module before uploading code to avoid serial communication errors.

Working Principle

The Bluetooth module receives data from the mobile app and sends it to the Arduino via serial communication. The Arduino reads the incoming data and maps it to a particular angle or movement of the servo motor.

For example:

Sending "0" from the app sets the servo to 0°

• Sending "0" from the app sets the servo to 0°

Sending "90" rotates the servo to 90°

• Sending "90" rotates the servo to 90°

Sending "180" rotates it fully

• Sending "180" rotates it fully

You can customize the code to accept different commands or angles depending on your application.

Arduino Code Summary

The Arduino code includes:

Initialization of the Servo library

• Initialization of the Servo library

Serial communication setup (Serial.begin(9600))

• Serial communication setup (Serial.begin(9600))

Reading incoming Bluetooth data

• Reading incoming Bluetooth data

Moving the servo motor to the desired angle using servo.write()

• Moving the servo motor to the desired angle using servo.write()


cpp

CopyEdit

if (Serial.available()) {
int angle = Serial.parseInt();
servo.write(angle);
}

cpp

CopyEdit
if (Serial.available()) {
  int angle = Serial.parseInt();
  servo.write(angle);
}

This snippet continuously checks if new data is available, converts it to an integer, and moves the servo accordingly.

Applications

This project is a great foundation for more advanced automation and control systems, including:

Wireless robotic arms

• Wireless robotic arms

Home automation (e.g., opening locks or windows)

• Home automation (e.g., opening locks or windows)

Remote-controlled vehicles

• Remote-controlled vehicles

Educational demos and teaching tools

• Educational demos and teaching tools

Conclusion

Controlling a servo motor using Bluetooth and Arduino is a fun and practical way to understand wireless communication and motor control. This project is beginner-friendly, requires minimal hardware, and can be expanded easily into more complex systems. Whether you're creating a robotic arm or a smart home device, this basic setup offers a solid starting point.