HC-05 Bluetooth Module
Classic Bluetooth serial module for phone-controlled prototypes.
AI Ready Overview
Quick Summary
HC-05 is a bluetooth module commonly used in FYP and embedded projects. It is best for bluetooth robot car and phone-controlled relay, with wiring and testing planned around Arduino, ESP32, STM32.
Difficulty
Beginner
Time Required
1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype
Cost
RM8-RM20 module range in Malaysia; full project cost depends on scope.
Components
HC-05, Arduino, ESP32, STM32
Overview
What is HC-05?
HC-05 is a classic Bluetooth SPP module used for phone-to-Arduino serial control. It is popular in robot cars, home automation and simple app control demos.
Engineering Reference
Quick Specs
| Operating Voltage | 3.3V logic / 5V module |
|---|---|
| Interface | UART, Bluetooth |
| Difficulty | Beginner |
| Typical Malaysia Price | RM8-RM20 |
| Best For | Bluetooth robot car, Phone-controlled relay |
Real Usage Notes
Suitable / Not Suitable
Suitable for
- ✓ Bluetooth robot car
- ✓ Phone-controlled relay
- ✓ Simple serial control
Not suitable for
- ✕ iOS BLE apps
- ✕ Internet connectivity
- ✕ Long-range wireless
Build Planning
Difficulty
HC-05 is rated Beginner. Plan around 1-3 days for basic wiring and sample code; 1 week if used inside a complete fyp prototypedepending on wiring, libraries, calibration, dashboard/app integration and testing evidence.
Build Planning
Time Required
1-3 days for basic wiring and sample code; 1 week if used inside a complete FYP prototype
Malaysia Price Guidance
Cost
Typical module price range: RM8-RM20. This is component guidance only; a complete FYP cost depends on controller, sensors, casing, display, app/dashboard, documentation and timeline.
Connections
Pinout
VCC
Power input. Check whether the module expects 3.3V logic or 5V module before wiring.
GND
Common ground with the controller and external supply.
UART
Main UART connection used by the module.
IO
Additional signal pins depend on the exact module variant.
Platform Notes
Wiring Guides
HC-05 with Arduino / ESP32
Connect power, ground and the UART / Bluetooth signal lines. Use level shifting when a 5V module connects to a 3.3V controller.
| HC-05 VCC | 3.3V logic |
|---|---|
| HC-05 GND | Controller GND |
| Signal pins | UART, Bluetooth |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using HC-05
Related Projects
Compare Options
Alternative Components
Student Questions
FAQ
Is HC-05 good for FYP projects?
Yes, HC-05 is suitable for FYP work when the project matches its limits: Bluetooth robot car and Phone-controlled relay.
What is the most common HC-05 mistake?
Connecting 5V TX to module RX without checking level