Arduino UNO Smart Home Lighting Simulation w/LEDs, HC-05 Bluetooth Module + mBlock 3 [Tutorial]

Summary

This tutorial guides viewers on creating a smart home lighting system using Arduino components and an Android phone. It covers wiring the Arduino Uno board with LEDs, resistors, and an HC-05 Bluetooth module. The process involves connecting the setup to an Android device using the Arduino Bluetooth controller app, programming the system with Mblock software, and controlling the lights via Bluetooth commands. The video concludes with a demonstration of the system's functionality, showcasing how to turn lights on and off remotely.

Takeaways

• 🔧 The tutorial is about creating a smart home lighting system using Arduino components and an Android phone.
• 📱 An Android app called Arduino Bluetooth Controller is used to control the system, demonstrated with a Samsung phone.
• 💡 The main components include an Arduino Uno R3 board, breadboard, 3 LEDs, resistors, jump wires, and an HC-05 Bluetooth module.
• 🛠 The wiring involves connecting the Arduino to the breadboard, LEDs, resistors, and Bluetooth module as per the Fritzing diagram.
• 🔌 The Bluetooth module HC-05 connects with the Arduino board using TXD and RXD pins for communication.
• 📶 The Bluetooth module is powered up and tested by pairing it with an Android phone, using password 1234.
• 💻 MBlock software (version 3) is used to program the Arduino and control the system. Custom extensions for Bluetooth programming are required.
• 🔢 The system is programmed to respond to specific numeric inputs (e.g., 4 to turn on the living room light, 1 to turn it off).
• 🛑 The RX pin must be disconnected while uploading the program to the Arduino board to avoid upload failure.
• 🖱 Once programmed, the Android app can control the lights using buttons instead of typing commands, providing a user-friendly interface.

Q & A

What components are required to build the smart home lighting system using Arduino?

The required components include an Arduino Uno R3 board, a breadboard, three LED lights, three 220-ohm or 1k-ohm resistors, nine jumper wires, an HC-05 Bluetooth module, and an Android phone with the Arduino Bluetooth controller app.

How do you connect the Arduino Uno board to the breadboard?

You start by connecting the ground wire from the Arduino to the negative rail on the breadboard, and the 5V wire from the Arduino to the positive rail.

What is the role of the HC-05 Bluetooth module in the project?

The HC-05 Bluetooth module enables wireless communication between the Arduino setup and the Android phone, allowing the user to control the LEDs remotely via Bluetooth.

How do you ensure proper wiring of the Bluetooth module to the Arduino board?

You connect the TXD (transmit) pin on the Bluetooth module to the RX (receive) pin on the Arduino and the RXD pin on the Bluetooth module to the TX pin on the Arduino. Additionally, the module is powered by connecting GND to ground and VCC to the 5V rail.

What is the purpose of the resistors in the circuit?

The resistors, connected to the negative (short) legs of the LEDs, are used to limit the current flowing through the LEDs to prevent damage.

How are the LEDs controlled using the Arduino code?

The LEDs are connected to digital pins 5, 6, and 7 of the Arduino. By receiving specific commands (numbers) via Bluetooth, the Arduino code turns the LEDs on or off by setting the corresponding pins high or low.

What steps are involved in setting up the Arduino Bluetooth controller app on the Android phone?

First, download the Arduino Bluetooth controller app from the Play Store. Then, pair the phone with the HC-05 Bluetooth module by entering the default password (1234). Once paired, the app can send commands to the Arduino to control the LEDs.

How do you configure the buttons in the Arduino Bluetooth controller app?

Within the app, you assign different buttons to send specific numbers (commands) corresponding to each LED’s on/off state. For example, button 1 sends '4' to turn on the living room light, and button 2 sends '1' to turn it off.

What does the code do when the 'all lights on' command is received?

When the 'all lights on' command (number 9) is received via Bluetooth, the code sets all the LED pins (living room, bedroom, and dining room) to HIGH, turning on all the lights.

How do you upload the Arduino program to the board and ensure the Bluetooth module doesn't interfere?

Before uploading the program, the RX pin on the Bluetooth module must be disconnected from the Arduino board. After the upload is complete, the RX pin can be reconnected to allow Bluetooth communication.