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HC-05 Bluetooth Module - Tutorial, Arduino Interface - Tutorial
Bluetooth esp8266 module hc circuit diagram interfacing connect nodemcu led shown below simple very connections Bluetooth module interfacing with esp8266: controlling an led Bluetooth audio receiver ca-6928 module 5v for usb mp3 car stereo
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KCX BT001 Wireless Bluetooth 4.2 Audio Receiver Module Circuit Board
Bluetooth Module Interfacing with ESP8266: Controlling an LED
HC-05 Bluetooth Module - Tutorial, Arduino Interface - Tutorial