Bluetooth Module with Arduino Basics
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Questions and Answers

What is the primary function of the HC-05 Bluetooth Module?

  • Controlling a vacuum cleaner
  • Wireless communications between microcontrollers or devices (correct)
  • Monitoring temperature changes
  • Storing data in memory chips

    • The Bluetooth Module is named after King Harald Bluetooth due to his contribution to electronics.

    False (B)

    What year was Bluetooth technology standardized by industry leaders?

    1996

    The Bluetooth Module has a nominal range of _____ meters.

    <p>10</p> Signup and view all the answers

    Match the following modes with their descriptions:

    <p>AT Mode = Uses AT commands to change module settings Data Mode = Exchanges data between devices Slave Role = Waits for other devices to initiate a connection Master Role = Initiates connections with slave devices</p> Signup and view all the answers

    Which of the following is NOT a setting that can be configured in AT Mode?

    <p>Email settings (A)</p> Signup and view all the answers

    The Bluetooth logo merges the Younger Futhark runes for the initials of King Harald.

    <p>True (A)</p> Signup and view all the answers

    What is the maximum operating voltage of the HC-05 module?

    <p>3.3V (D)</p> Signup and view all the answers

    What is the default PIN code for pairing with an HC-05 module?

    <p>1234 (D)</p> Signup and view all the answers

    Name one common application of the Bluetooth Module.

    <p>Controlling projects using a smartphone</p> Signup and view all the answers

    The HC-05 module can connect to multiple Bluetooth devices simultaneously.

    <p>False (B)</p> Signup and view all the answers

    What mode must the HC-05 module be in to change its settings using AT-style commands?

    <p>AT mode</p> Signup and view all the answers

    The TXD of the HC-05 module is connected to the Arduino's D2 pin.

    <p>False (B)</p> Signup and view all the answers

    What software library is used to handle serial communication with the HC-05 module?

    <p>SoftwareSerial</p> Signup and view all the answers

    The pin on the HC-05 responsible for connecting the positive supply voltage is called ______.

    <p>VCC</p> Signup and view all the answers

    To establish a Bluetooth connection, you need to install the ________ application on your smartphone.

    <p>Serial Bluetooth Terminal</p> Signup and view all the answers

    Match the following HC-05 LED statuses with their meanings:

    <p>Flashing rapidly at about 2 Hz = Bluetooth pairing mode Two quick flashes followed by a pause = Connected to a device Slow and steady rate = AT mode</p> Signup and view all the answers

    Match the HC-05 connections to their respective Arduino pins:

    <p>TXD = D3 RXD = D2 GND = GND VCC = 5V</p> Signup and view all the answers

    Which pin should be connected to the TX of the microcontroller?

    <p>RXD (C)</p> Signup and view all the answers

    What must you do first before pairing the HC-05 module with your Android phone?

    <p>Ensure the HC-05 module is powered on (C)</p> Signup and view all the answers

    The HC-05 module requires a voltage supply ranging from 3.6V to 6V.

    <p>True (A)</p> Signup and view all the answers

    You can connect to the HC-05 module without installing a Bluetooth terminal application.

    <p>False (B)</p> Signup and view all the answers

    What role does the HC-05 module assume when actively searching for Bluetooth devices?

    <p>Master role</p> Signup and view all the answers

    What should you observe in your Android device after tapping the Bluetooth icon?

    <p>Pair new device option</p> Signup and view all the answers

    Flashcards

    What is Bluetooth?

    A short-range wireless technology that allows data exchange between devices.

    What is a Bluetooth Module?

    A chip that integrates Bluetooth functions and enables wireless data transmission.

    What is an HC-05 module?

    A Bluetooth Module that acts as a bridge between Bluetooth devices and serial ports. It allows communication between microcontrollers and devices like smartphones or computers.

    What is AT-mode in the HC-05 module?

    A mode in the HC-05 module where you can configure settings like its name, baud rate, and PIN code using specific commands.

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    What is Data Mode in the HC-05 module?

    A mode where the HC-05 module acts as a transparent bridge for data transfer between connected devices.

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    What is Slave Role in the HC-05 module?

    In this role, the HC-05 module passively waits for another device to establish a connection.

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    The History of Bluetooth

    A wireless communication protocol using radio waves, named after King Harald Bluetooth of Denmark, known for uniting the Scandinavian kingdoms.

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    The Bluetooth Logo

    The standard symbol for Bluetooth uses a bind rune of two Futhark runes: Hagall and Bjarkan. These runes represent Harald Bluetooth's initials.

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    Default Role

    The default role for HC-05 module, commonly used in projects involving smartphone control.

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    Master Role

    The HC-05 module actively searches for other Bluetooth devices and attempts to establish a connection. Used when two microcontrollers need to communicate wirelessly.

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    Slave Role

    The HC-05 module passively waits for another device to initiate a connection. Used for receiving data.

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    HC-05 Operating Voltage

    The maximum operating voltage for the core HC-05 chip. This voltage is regulated by a linear 3.3V regulator within the module.

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    HC-05 Status LED

    A LED on the HC-05 module that indicates the module's current status. It flashes rapidly when in pairing mode, flashes in a specific pattern when paired, and blinks slowly when in AT mode.

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    HC-05 AT Mode

    A configuration mode where the HC-05 module receives special AT commands to modify settings such as name, baud rate, and password. It is accessed by sending special characters.

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    HC-05 State Pin

    The pin on the HC-05 module that is used to determine the current status of the module. It is often linked to an indicator LED.

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    HC-05 RXD Pin

    The pin on the HC-05 module that receives serial data from a microcontroller. Connects to the microcontroller's TX pin.

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    Bluetooth Terminal App

    A program installed on a smartphone that allows communication with devices via Bluetooth.

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    PIN Code for HC-05

    The pin code assigned to the HC-05 module for security purposes, it is typically set as '1234' by default.

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    Resistor Connection for HC-05 RX

    A method of connecting the HC-05 module's RX pin to the Arduino's D2 pin using a resistor.

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    SoftwareSerial Library

    It allows the HC-05 module to communicate with the Arduino by providing a serial interface.

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    Pairing with HC-05

    The HC-05 module's ability to connect to another device.

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    Pin Connections of HC-05 and Arduino

    Connecting the HC-05 module's RX pin to the Arduino's D2 pin and the HC-05 module's TX pin to the Arduino's D3 pin.

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    Powering Up the HC-05

    The HC-05 module needs to be powered on to be ready for communication.

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    HC-05 Receiving Data

    The HC-05 module receives data from the connected device.

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    Study Notes

    Bluetooth Module with Arduino

    • The Bluetooth module with Arduino is a basic circuit set of integrated Bluetooth functions.
    • It can be used for wireless network transmission and real-time data logging, or for controlling projects.
    • The HC-05 is an example of a Bluetooth module.

    Objectives

    • Define Bluetooth module
    • Configure the electrical circuit of the Bluetooth module with Arduino
    • Program the Bluetooth module
    • Use the Bluetooth module with Arduino to control an LED

    Supported Bluetooth Devices

    • Bluetooth speaker
    • Bluetooth headphones
    • Bluetooth mouse and keyboard
    • Smartphone and tablet
    • Printer
    • PC
    • Notebook

    What is Bluetooth?

    • The name Bluetooth comes from King Harald "Bluetooth" Gormsson, who lived over a thousand years ago.
    • He was known for uniting Denmark and Norway (in 958).
    • His dead tooth's dark blue/grey color gave him the nickname.
    • In 1996, Intel, Ericsson, and Nokia collaborated to standardize Bluetooth, a short-range radio technology for supporting connectivity between products.
    • The name "Bluetooth" was originally a placeholder to be used until a better name could be found, as suggested by Jim Kardach of Intel.

    What is HC-05?

    • HC-05 is a Bluetooth-to-Serial-Bridge module for wireless communications.
    • It is used to connect two microcontrollers or a microcontroller to a smartphone, laptop, or desktop PC.
    • It has a nominal range of 10 meters.
    • It is easy to configure and use.

    Modes of Operation

    • AT Mode:
      • Uses AT commands to change HC-05 settings.
      • Configure name, baud rate, PIN code, and data rate.
    • Data Mode:
      • Exchanging data between devices.
      • HC-05 acts as a transparent data gateway.

    Connection Roles

    • Slave Role:
      • HC-05 waits for other devices to initiate a connection.
      • Used in projects where you want to control things with a smartphone.
    • Master Role:
      • HC-05 actively searches and initiates Bluetooth connections with other devices.
      • Used in microcontroller communication.

    HC-05 Parts

    • Power:
      • The HC-05 chip operates on 3.3V.
      • The module includes a 3.3V linear regulator for voltage between 3.6V and 6V.
    • Status LED:
      • When powered, the LED flashes rapidly (about 2Hz) in pairing mode.
      • Paired: Flashes twice, pauses, repeats.
      • AT Mode: Blinks slowly and steadily.
    • AT Button :
      • It is used to enter configuration mode.
    • Pinout:
      • GND: Common ground pin.
      • VCC: Positive supply voltage (3.6V to 6V).
      • EN: Enables the on-board regulator.
      • RX: Receives data from the microcontroller.
      • TX: Sends data to the microcontroller.

    Procedure

    1. Connect the HC-05 to an Arduino or micro-controller.
    2. Install a Bluetooth terminal app on your smartphone, e.g. "Serial Bluetooth Terminal."
    3. Use the Software Serial library to connect the HC-05's RX and TX to the Arduino's pins.
    4. Connect the HC-05 TXD to Arduino's D3
    5. Connect the HC-05 RXD to Arduino's D2
    6. Add a 1K resistor between HC-05 Rx and Arduino's D2, and add a 2K resistor between HC-05 Rx and GND.

    Connecting to Android Phone

    • Ensure the HC-05 is powered and ready to connect.
    • Enable Bluetooth on your smartphone.
    • Touch and Hold the bluetooth icon on your phone and select "Pair new device"
    • Select your HC-05 name from the list of available devices.
    • Enter the PIN code (1234 is typical).
    • Use the Bluetooth Serial Terminal app for further communication, if needed. Install if necessary.

    Output

    • The initial message from the Arduino via the Bluetooth serial module and code.

    Coding

    • Example code to initialize the Serial and Bluetooth communication.

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    Bluetooth Module with Arduino PDF

    Description

    Explore the fundamentals of the Bluetooth module used with Arduino in this quiz. Learn about its configurations, programming techniques, and applications such as controlling an LED. Discover how this technology enables wireless communication in various devices.

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