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Questions and Answers
What is the primary function of the HC-05 Bluetooth Module?
What is the primary function of the HC-05 Bluetooth Module?
The Bluetooth Module is named after King Harald Bluetooth due to his contribution to electronics.
The Bluetooth Module is named after King Harald Bluetooth due to his contribution to electronics.
False
What year was Bluetooth technology standardized by industry leaders?
What year was Bluetooth technology standardized by industry leaders?
1996
The Bluetooth Module has a nominal range of _____ meters.
The Bluetooth Module has a nominal range of _____ meters.
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Match the following modes with their descriptions:
Match the following modes with their descriptions:
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Which of the following is NOT a setting that can be configured in AT Mode?
Which of the following is NOT a setting that can be configured in AT Mode?
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The Bluetooth logo merges the Younger Futhark runes for the initials of King Harald.
The Bluetooth logo merges the Younger Futhark runes for the initials of King Harald.
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What is the maximum operating voltage of the HC-05 module?
What is the maximum operating voltage of the HC-05 module?
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What is the default PIN code for pairing with an HC-05 module?
What is the default PIN code for pairing with an HC-05 module?
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Name one common application of the Bluetooth Module.
Name one common application of the Bluetooth Module.
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The HC-05 module can connect to multiple Bluetooth devices simultaneously.
The HC-05 module can connect to multiple Bluetooth devices simultaneously.
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What mode must the HC-05 module be in to change its settings using AT-style commands?
What mode must the HC-05 module be in to change its settings using AT-style commands?
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The TXD of the HC-05 module is connected to the Arduino's D2 pin.
The TXD of the HC-05 module is connected to the Arduino's D2 pin.
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What software library is used to handle serial communication with the HC-05 module?
What software library is used to handle serial communication with the HC-05 module?
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The pin on the HC-05 responsible for connecting the positive supply voltage is called ______.
The pin on the HC-05 responsible for connecting the positive supply voltage is called ______.
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To establish a Bluetooth connection, you need to install the ________ application on your smartphone.
To establish a Bluetooth connection, you need to install the ________ application on your smartphone.
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Match the following HC-05 LED statuses with their meanings:
Match the following HC-05 LED statuses with their meanings:
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Match the HC-05 connections to their respective Arduino pins:
Match the HC-05 connections to their respective Arduino pins:
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Which pin should be connected to the TX of the microcontroller?
Which pin should be connected to the TX of the microcontroller?
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What must you do first before pairing the HC-05 module with your Android phone?
What must you do first before pairing the HC-05 module with your Android phone?
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The HC-05 module requires a voltage supply ranging from 3.6V to 6V.
The HC-05 module requires a voltage supply ranging from 3.6V to 6V.
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You can connect to the HC-05 module without installing a Bluetooth terminal application.
You can connect to the HC-05 module without installing a Bluetooth terminal application.
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What role does the HC-05 module assume when actively searching for Bluetooth devices?
What role does the HC-05 module assume when actively searching for Bluetooth devices?
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What should you observe in your Android device after tapping the Bluetooth icon?
What should you observe in your Android device after tapping the Bluetooth icon?
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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
- Connect the HC-05 to an Arduino or micro-controller.
- Install a Bluetooth terminal app on your smartphone, e.g. "Serial Bluetooth Terminal."
- Use the Software Serial library to connect the HC-05's RX and TX to the Arduino's pins.
- Connect the HC-05 TXD to Arduino's D3
- Connect the HC-05 RXD to Arduino's D2
- 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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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.
