HC-06 Classic Bluetooth serial module pinout

HC-06 bridges Classic Bluetooth serial traffic to a local UART. The vendor documented separate master and slave builds.

HC-06 bare module

34 contacts Current package

Guangzhou HC / Wavesen · 34 castellated contacts and an integrated antenna.

HC-06 bare module pinout

HC-06 bare module

Component-side view with the antenna at the top. Pad 1 is at upper left. The numbering passes down the left side, across the bottom and up the right side. Scroll the map to reach all contacts.

Selected pin details

13 · GND

Return · Ground

Common return. Connect every GND contact.

Guangzhou HC HC-06 Module Data Sheet, § 3

Electrical limits · Link to this pin

All 34 pins

Pin	Signal	Direction	Function
1	UART_TX Output	Output	Module serial data output. Connect to the host RX input.
2	UART_RX Input	Input	Module serial data input. Use 3.3 V logic.
3	UART_CTS Input	Input	Active-low hardware flow-control input.
4	UART_RTS Output	Output	Active-low hardware flow-control output.
5	PCM_CLK Bidirectional	Bidirectional	Serial PCM clock.
6	PCM_OUT Output	Output	Serial PCM data output.
7	PCM_IN Input	Input	Serial PCM data input.
8	PCM_SYNC Bidirectional	Bidirectional	PCM frame synchronization.
9	AIO0 Bidirectional	Bidirectional	Programmable analog I/O.
10	AIO1 Bidirectional	Bidirectional	Programmable analog I/O.
11	RESETB Input	Input	Active-low module reset.
12	VCC Supply	Supply	Main 3.3 V supply connection.
13	GND Return	Return	Common return. Connect every GND contact.
14	1V8 Regulator rail	Regulator rail	Internal regulator rail. Leave open with the standard 3.3 V supply circuit.
15	USB_D− Bidirectional	Bidirectional	USB differential data minus.
16	SPI_CSB Input	Input	Active-low SPI chip select.
17	SPI_MOSI Input	Input	SPI data input.
18	SPI_MISO Output	Output	SPI data output.
19	SPI_CLK Input	Input	SPI clock input.
20	USB_D+ Bidirectional	Bidirectional	USB differential data plus.
21	GND Return	Return	Common return. Connect every GND contact.
22	GND Return	Return	Common return. Connect every GND contact.
23	PIO0 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
24	PIO1 Bidirectional	Bidirectional	The reference firmware uses this pad for status LED drive.
25	PIO2 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
26	PIO3 Bidirectional	Bidirectional	Wake input on the reference master circuit.
27	PIO4 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
28	PIO5 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
29	PIO6 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
30	PIO7 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
31	PIO8 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
32	PIO9 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
33	PIO10 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.
34	PIO11 Bidirectional	Bidirectional	Programmable I/O. Its application function depends on the installed firmware.

Signal assignments

3.3 V serial UART

Connect module TX to host RX and module RX to host TX. Use a shared return and a 3.3 V logic adapter.

Electrical limits

Parameter	Limit	Conditions and source
Module supply3.1–4.2 V	3.1–4.2 V	Typical connection is a regulated 3.3 V rail at pad 12. Guangzhou HC HC-06 Module Data Sheet, §§ 2–3
Pairing current30–40 mA	30–40 mA	Reported by the vendor for the bare radio module. Guangzhou HC HC-06 Module Data Sheet, § 2

Models and documents

The pin map covers the Wavesen bare 34-pad module from the April 2011 datasheet. The circuit uses the documented Linvor AT dialect with the radio disconnected.

Wavesen HC-06: 34-pad Wavesen module from the 2011 manufacturer drawing.

Guangzhou HC HC-06 Module Data Sheet· Guangzhou HC manufacturer PDF hosted by Olimex. Pin configuration and Linvor command set.
Guangzhou HC HC series manual· Manufacturer’s HC-06 bench circuit and command framing, hosted by Manuals+.