HC-05 Bluetooth SPP Module
by Generic
SKU: PSA-CMP-HC05
No reviews yetTypical India street price
₹180–₹320
Classic Bluetooth serial link to phones / laptops (SPP).
Interface: UART
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Concept
Wireless UART: what you print to Serial1 appears on a phone terminal.
A little theory
Bluetooth 2.0 SPP profile. Default baud 9600. AT mode via KEY pin / 38400 baud. In the classroom, treat HC-05 Bluetooth SPP Module as a intermediate part using UART. Typical India street price is about ₹180–₹320. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
TX/RX crossed to MCU. Pair PIN 1234. Use a serial Bluetooth app.
Classroom & project use
- Phone-controlled robot
- Wireless debug
- Communication Modules classroom demo
Buying in India
Precautions
- Level-shift RX if module is 3.3 V strict
- Don’t swap TX/RX blindly
Specifications
| Profile | SPP |
| Baud | 9600 default |
| Band | 2.4 GHz |
| Category | Communication Modules |
| Difficulty | Intermediate |
| Voltage | 3.3V logic (5V VCC often OK) |
| Interface | UART |
Pinout
VCC | GND | TXD | RXD | KEY | STATE
