KCX_BT002 is a multi-purpose Bluetooth audio module integrating Bluetooth audio and Bluetooth calling. It supports matching various smart phone players on the market to play music, and supports functions such as voice reporting of incoming calls, answering calls / hanging up calls / redialing recent calls. Just by implanting this decoder board into your product, you can upgrade ordinary wired audio products to wireless Bluetooth audio products.

typical application 

 ● Home speakers changed to Bluetooth speakers 

 ● Speaker repair and upgrade 

 ● Car player modification and upgrade 

 ● Computer speaker modification and upgrade

Features and Advantages 

 1: Superior Durability and Coexistence 

 2: Ensure the stability of Bluetooth transmission through a variety of technologies 

 3: Intuitive LED indication 

 4: Voice prompt, call voice report number 

 5: External buttons do not need a voltage divider resistor, which is convenient and easy to use 

 6: Wireless transmission distance ≥ 10 meters

Bluetooth connection and pairing operation and instructions 

 After power on, you hear the voice prompt "Bluetooth Mode", indicating that the module has entered the Bluetooth mode, turn on the Bluetooth switch of the mobile phone, search for nearby Bluetooth devices for a few seconds, and see the Bluetooth device named "Bluetooth Audio" on the mobile phone. Can be connected to mobile phone bluetooth. After the connection is made, the decoder board will play a voice prompt of "connection successful". At this time, open the player of the mobile phone to play music, and the music on the mobile phone can be wirelessly transmitted to the Bluetooth module through Bluetooth.

incoming calls and calls 

 When the mobile phone connected to the Bluetooth module has an incoming call, the module will send out a voice broadcast to broadcast the caller number of the other party. You can short press the P/P button of the Bluetooth module to answer the incoming call. After the call is connected, the call audio signal comes from the electret microphone external to the Bluetooth module (the Bluetooth module must be connected to the electret microphone to use the Bluetooth module’s call function, otherwise the other party must connect to the electret microphone). no sound). In addition, during the call, you can switch to the mobile phone to answer or the Bluetooth module to answer at will.

Button function description 

 VOL-key: short press: volume-, long press: volume continuous- 

 VOL+ key: short press: volume +, long press: volume continuous + 

 PREV key: short press: previous song 

 NEXT key: short press: next song 

 P/P key: short press to pause/double click to call back 

 Incoming call: short press to answer/long press to reject 

 During a call: short press to hang up the current call 

 In Bluetooth mode: double click to call back the last call

Selection and Connection of Peripheral Devices 

 (1): Power interface (pins 1 and 2) 

 The module power input port is +5V, and GND is connected to the positive and negative poles of the power supply respectively. 

 (2): External button interface (pins 3-7) 

 External touch button, valid for ground. 

 (3): External microphone interface (8 pins) 

 The positive pole of the external electret microphone (the negative pole of the electret microphone is connected to GND) 

 (2): Audio signal interface (9, 10) 

 OUTR/OUTL: Used to output stereo audio signals to connect to an external power amplifier or to connect headphones.

Description of Status Indicators 

 The decoder board has its own status indicator (blue LED), which is used to display various working states of the module 

 Pairing: LED flashes quickly (on and off for 250ms each) 

 MP3 playing: LED flashes slowly (on for 500ms and off for 500ms) 

 Pause state: LED is always on 

 Bluetooth playing: LED flashes twice every 2s