Spark Logic

HC-06 Classic Bluetooth serial module connection guide

HC-06 Classic Bluetooth serial module HC-06 bare module wiring guide with power, signal assignments, and bench checks.

HC-06 bare module

34 contacts Current package

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

Test the unpaired UART

Required

Connect a 3.3 V serial adapter. Power up with the radio disconnected from any remote device and select 9600 bit/s, 8N1, for the documented factory settings.

  • 3.3 V supply
    • VCC (12)
    • Regulated 3.3 V
    • C1.1
  • Ground
    • GND (13)
    • GND (21)
    • GND (22)
    • Supply return
    • Host ground
    • C1.2
  • Host to module
    • UART_RX (2)
    • Host UART TX
  • Module to host
    • UART_TX (1)
    • Host UART RX
C1 100 nF between 3.3 V supply and Ground3.3 V supplyC1 100 nFGround

Bench checks

  • Send the two ASCII bytes AT without CR or LF. Expect OK. Leave about one second between commands.
  • When UART settings have been changed, use the saved speed. A paired link uses the UART for data.

Guangzhou HC HC-06 Module Data Sheet, § 9; HC series manual, § 4.

HC-06 bare module wiring map

Select a contact to inspect it.

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

1 · UART_TX

Output · Outputs

Module serial data output. Connect to the host RX input.

Guangzhou HC HC-06 Module Data Sheet, § 3

Electrical limits · Pin in the reference

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.