BT Shield (Master Slave)

Overview

BT shield V2.2 is a serial port Bluetooth module (with master and slave mode) breakout board, it’s compatible with Arduino and IFlat-32, it can directly plug on Arduino/IFlat-32 board, use UART port for communication with Arduino/IFlat-32 or PC.

Specifications

Microprocessor	CSR BC417
PCB size	53.3mm X 47mm X 1.6mm
Indicators	PWR,State
Power supply	5V DC
IO	6
Communication Protocol	UART/Bluetooth 2.0
RoSH	Yes

Electrical Characteristics

Specification	Min	Type	Max	Unit
Power Voltage	4.5	5	5.5	VDC
Input Voltage VH (Target Voltage = 3.3V)	3	3.3	3.6	VDC
Input Voltage VH (Target Voltage = 5V)	4.5	5	5.5	V
Input Voltage VL:	-0.3	0	0.5	V
Current Consumption	-	20	40	mA

Hardware

UART Multiplexer (For free UART connection setting)

You can use the jumper to connect the TXD and RXD pins of HC-05 to D0, D1, D4~D7 pin of Arduino.

When using the connection as Figure 3, the BT shield connects to the ATMega328 chip on board.

When using the connection as Figure 4, the HC-05 connects with the FT232RL chip, and the FT232RL connect to PC by USB. Whit this configuration you can use the serial software on PC to control or configure the HC-05 module.

Except the 2 configurations above, you can connect the TXD and RXD to any other pins from D4-D7, and using the software-serial library to control the HC-05 module.

Mode Switch

The Mode Set Switch is connected to PIO11, when it is pushed to CMD and powered on, the HC-05 enter command mode, HC-05 module can receive and response AT command in this mode. When it is pushed to DATA and powered on. The HC-05 enters data mode and will not accept AT command.