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This HC-05 module is a compact and reliable Bluetooth communication module designed for wireless data transfer in embedded systems and DIY electronics projects, enabling seamless serial communication between microcontrollers and Bluetooth-enabled devices. This version is sold without the base plate that some HC-05 boards include, which gives a smaller footprint where space is tight.
It communicates over a UART serial interface and supports both Master and Slave modes, so it can either connect out to another Bluetooth device or wait to be connected to, and it is compatible with Arduino, ESP32, ESP8266 and Raspberry Pi.
Input supply voltage is 3.6 to 6 V and input current is about 50 mA. Maximum operating range is 10 m, and it works in the 2.4 GHz ISM band. Configuration, including the mode, name and baud rate, is done with AT commands, and the module is described as compact, low power and suited to fast, reliable data transmission.
Because this version has no base plate, wire directly to its pins and check the pin labelling carefully before powering it, since the pinout can differ slightly from boards that include a base plate.
Makers who want a smaller HC-05 module for a compact enclosure, and who are comfortable wiring a bare board directly.
Because this version has no printed base plate labels next to each pin in some batches, check the small print on the module itself or the maker's pinout diagram before wiring VCC, GND, TX, RX, and any enable or state pins, so you do not reverse TX and RX by mistake.
No, this version is sold without one.
Master and Slave, switchable by AT command.
3.6 to 6 V.
Up to 10 m.
With AT commands over the UART interface.
| Brand | Generic |
|---|---|
| Protocol | Bluetooth (Classic, SPP) |
| Selling unit | PCS |
