Bluetooth & BLE ModulesCompatible
HC-05 Bluetooth Serial Module
Classic Bluetooth serial link for Arduino: pair it with an Android phone and send commands or data wirelessly. Works as master or slave, about 10 m range – for Bluetooth-controlled cars, ligh
- Bluetooth Version
- 2.0 + EDR (classic)
- Profile
- Serial Port Profile (SPP)
- Role
- Master / slave
- Default Baud Rate
- 9600 (AT mode 38400)
- Default PIN
- 1234 or 0000
- Range
- About 10 m
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Specifications
- Manufacturer Part Number
- HC-05
- Bluetooth Version
- 2.0 + EDR (classic)
- Profile
- Serial Port Profile (SPP)
- Role
- Master / slave
- Default Baud Rate
- 9600 (AT mode 38400)
- Default PIN
- 1234 or 0000
- Range
- About 10 m
- Supply Voltage
- 3.6–6 V
- Logic Level
- 3.3 V (RXD not 5 V tolerant)
- Pins
- EN, VCC, GND, TXD, RXD, STATE
- iOS Support
- No (classic Bluetooth only)
Description
The HC-05 replaces a serial cable with Bluetooth. Your Arduino just uses Serial.print() and Serial.read(), and a Bluetooth terminal app on the phone sees the same data. It can also connect to another HC-05 as master to link two boards.
Features
- Bluetooth 2.0 + EDR, Serial Port Profile (SPP)
- Master or slave role, configurable with AT commands
- Default: 9600 baud, name 'HC-05', PIN 1234 (sometimes 0000)
- Range about 10 m in open space
- Base board with 3.3 V regulator: 3.6–6 V supply; LED shows pairing state; button enters AT mode
- 6 pins: EN (KEY), VCC, GND, TXD, RXD, STATE
Good to know
The RXD pin is 3.3 V – from a 5 V board, use a divider (1 kΩ + 2 kΩ). HC-05 is classic Bluetooth, so it works with Android and Windows but not with iPhones (they need BLE modules).
Package includes
1 × HC-05 module on base board