Bluetooth to TTL
Usages:
1. To replace serial connection cable, includes TXD and RXD signals. Can direct connect to microcontroller or device with TTL or serial interface, also able to convert the output signal level to RS232 by MAX232 chips and connect to normal 9 pins serial port.
2. Connecting microcontroller from computer through the bluetooth device for sending and receiving data.
3. Connecting microcontroller from mobile device through the bluebooth device. Wireless remote control the microcontroller by mobile phone.
4. For STC Microcontroller program wireless downloads. This module is equivalent to a download cable, and can give a full range of STC download.
Caution:
This bluetooth module support 3.3V and 5V system, the module came with 5V interface, and output with VCC, TXD, RXD and GND 4 ports (normally to use 4 pins). Other connectors and accessories are included for customer to make their actual connection.
Features:
1. Easy to use without learning details, the 2 modules will connect automatically after power on. Auto build up the wireless serial connection.
2. Support 5V and 3.3V interface, customer no need to worry for matching the power level.
3. Support time-to-many communication, can binding module specified address for communication.
4. Build in switchable master and slave mode, using AT command to switch the 2 mode.
5. With 9 pins I/O ports (2 reserved), support both in/out mode.
6. Long communication distance, 40m for open area.
7. The module was 2 PCB composed design, and increasing the stability. Gold plating on 1.6mm thick PCB.
A. Bluetooth Module interface diagram
Viewing all pins assignment on front view, module compatible with 5.0V and 3.3V system. User can select their own preference and setting.
Module includes LED lights for link and working status, AT button for mode selection.
Module also includes 9 extended I/O pins (PIO0 and PIO1 reserved not use), user can extend all I/O pins for data in or out use. Normal I/O high voltage level is 3.3V, low voltage level is 0V, please be careful for the voltage input adjustment when using 5V system.
B. About bluetooth connection sample for normal user
1. Use for replacing serial cable connection (RS232 cable)
2. Only need 4 pins to build wireless data communication (2 for power), no program design requires, no need to learn bluetooth protocol, automatically connection after power on, easy and same as a normal serial cable.
3. Low power consumption, only 6ma to 8 ma working current after connected.
C. Two types of users
Ordinary User : Only need to build serial communication by bluetooth module for data transfer, no further requiorement.
Advance User : Hope that through programming
the microcontroller and other
devices can automatically
send AT commands to achieve
more. If a
machine with multiple
machines send and receive data to each other (time-to), the binding
module address, check
the working status module, use themodular expansion IO port,module at any time to modifythe role (master or slave),
modified serial port parameters (such as baud rate, etc.), change
passwords, etc. matching
1 Ordinary users andadvanced users in the
module wiring difference:
ordinary users only need to connect4 wires (VCC power line, GND ground, TXD and RXD
receiver transmitter). Advancedusers need to connect the
five lines (more than
one AT control side).
2 Ordinary users andadvanced users the difference in function: both can send and receive data.
Both can respond to all AT commands, but the average user
need to manually press the AT Mode button, advanced users
can be automatically controlleddevice programming, you can manually press the AT Mode
button control.
D. Advance user connection sample
E. About matching the signal voltage level
Serial output I/O of the bluetooth module is TTL level (When use in 3.3V system, 3.3V mean login 1, 0V mean logic 0. When use in 5V system, 5V mean logic 1, 0V mean logic 0). Not able to direct connect RS232 interface (RS232 interface is using +15V mean logic 1, -15V mean logic 0), must use MAX232 or SP3232 signal converter chip to convert bluetooth TTL signal to RS232 voltage level and then communicate with RS232 interface.
Bluetooth connection Samples
A. One to One communication (Using AT command setup Master mode, others in Slave mode)
B. One to many communication (Using AT command setup Master mode, others in Slave mode)
C. Personal computer connect to multiple bluetooth device (must in slave mode)
By using personal computer, you can connect multiple bluetooth device at the same time, and real time data transfer.
D. Smart Phone connect to multiple bluetooth device (must in slave mode)
By using smart phone device, you can connect multiple bluetooth device at the same time, and real time data transfer.
E. Sample to connect two microcontrollers
By using the 4 pins connection, Module A is able to communicate with Module B. Only few seconds for waiting the bluetooth module to build the connection as a serial cable.
For connecting the bluetooth model to a computer, you can use our USB-to-UART Convertor to connect the bluetooth module with the computer.
