HC-05 module: This module can be set to a transmitter or receiver, transmitter could pairing with receiver, receiver and receiver or transmitter and transmitter can't communication between, receiver could pairing with computers and cell phone Bluetooth, when buying, the default for receiver.
f = 2.4 to 2.485 GHz
1. VCC - 5V 2. GND
Android + Pair devices via bluetooth, pin = 1234.
Download Bluetooth Terminal.
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Ing. František Haluška