HC‐05 module is a Bluetooth Serial Port Protocol module, specifically manufactured for wireless communication between microcontrollers. It offers switching mode between master and slave mode configuration and communicates via Serial Communication at aa9600 baud rate which is easy to interface with controller. HC05 module operates on 3.3 V but we can attach it to 5V supply voltage as the module comes with an onboard 5v to 3.3 V regulator.

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