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HC-05 Bluetooth Module - Tutorial, Arduino Interface - Tutorial
Bluetooth module interfacing with esp8266: controlling an led Hc-05 bluetooth module Diy bluetooth speaker amplifier
Bluetooth esp8266 module hc circuit diagram interfacing connect nodemcu led shown below simple very connections
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Bluetooth Module Interfacing with ESP8266: Controlling an LED
Schematic homemade bluetooth speaker
HC-05 Bluetooth Module - Tutorial, Arduino Interface - Tutorial