SenMod HC-05 Arduino Wireless Bluetooth Receiver RF Transceiver Module Serial Port Module
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							VCC: positive power supply
							
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							GND: power supply is negative
							
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							RXD: the receiver, Bluetooth module receives from another device sent data; normally connected to other devices transmitting end TXD
							
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							TXD: sending end, the Bluetooth module to send data to other devices; receiving terminal is normally connected to other devices RXD
							
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							EN: Enable, then you need to enter the AT mode 3.3V
							
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