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Microduino-Shield BT 4.0 module is a plug-in device that supports Bluetooth 4.0 low energy standard.
Microduino-Shield BT 4.0 module is a bluetooth serial port transparent transmission module, using the 27 PIN standard Microduino interface, supporting the Arduino board and derivatives, such as Microduino core.
The module is designed by player ogre_c.
Features
- Microduino-Shield BT4.0 adopts U type 27 PIN interface of Microduino, combining with other Microduino modult to use;
- Microduino-Shield BT4.0 chooses the HM-10 BLE as the bluetooth core module;
- TI CC2540 chip with 256Kb space;
- Support AT instruction, capable of updating baud rate, device name,paring code and other related parameters as needed, flexible to use；
- Small, cheap, stackable;
- Open source hardware circuit design, compatible with the Arduino IDE development environment for programming;
- With uniformed Microduino interface standard and rich peripheral modules, it is flexible and convenient to have a quick connection and extension with other corresponding Microduino modules and sensors;
- 2.54 pitch row female connector for easy integration into breadboard.
Specifications
- Communication form: serial transmission;
- Power supply：+3.3VDC 50mA；
- Bluetooth protocol：Bluetooth Specification V4.0 BLE；
- Service support：Central & Peripheral UUID FFE0,FFE1；
- Frequency：2.4GHz ISM band；
- Modulation mode：GFSK(Gaussian Frequency Shift Keying)；
- Power of transmission：≤4dBm；
- Sensitivity：≤-84dBm at 0.1% BER；
- Transmission rate：
- Asynchronous: 6 kbps；
- Synchronous: 6 kbps；
- State indicator：
- Two states：
- Flashing means that the module has been powered but not matched well.
- Always lighting means that the module has been matched well and has started communication.
- By the indicator, it is very easy to the status of the module, which is conveniently.
Documents
Eagle PCB File:Microduino-BT Shield.zip
Main component
Development
Serial communication requirements
- Default serial configuration：
- Baud rate: 9600
- No check
- Data bits: 8
- Stop bit: 1
- As for Arduino IDE serial monitor：
- Set at："No line terminator"、"9600baud"
- For other serial debug software：
- Baud rate: 9600
- No check
- Data bits: 8
- Stop bit: 1
- We suggest using Microduino-Core32u4 to debug this BT module:
- Microduino-Core32u4 module can use the USB to simulate the serial 0, and BT uses the 32u4's serial 1 (RX0,TX1), so you don't need to change the existing jumper (RX0,TX1) and it won't impact program download or the serial port's function.
- Microduino Shield BT4.0 uses the default serial RX0,TX1 to communicate with Core module, so it can be directly connected with Microduino FT232.
Use PC to debug
- When debugging directly through the serial port：
- No need to stack the FT232 directly, and just cross connect the FT232 and BT4.0's RX0,TX1.
Use FT232R、Core download and debug
- If it keeps using the default jumper (RX0、TX1)：
- Unplug the Microduino Shield BT4.0 during downloading the program;
- If you want to change the jumper cables to meet your requirement, you need to cut the connection between two intermediate of the pad and RX0/TX1, and then connect them to D2, D3(or D9、D10).
- If it needs to change the jumper, you can change the serial connection of Microduino Shield BT4.0 and Microduino Core from "TX-RX0、RX-TX1" to:
- TX-D2、RX-D3 (For Core+'s Serial1)
- TX-D9、RX-D10 (you can adopt SoftwareSeria libray to solve the problem)
Pin description
| HM-10 Pin |
Microduino Pin |
Function
|
| TX |
RX0（orD2/D9） |
It serves as the serial transmission pin (TTL)，capable of connecting the RXD of a microcontroller
|
| RX |
TX1（orD3/D10） |
It serves as the serial receiving pin (TTL)，capable of connecting the TXD of a microcontroller
|
Application
Download progrm
Test program：File:BLE debug uart1.zip,File:BLE LightBlue time.zip
Shield BT4.0 pass-through data to IOS devices
- Prepared hardware：Microduino FT232R, Microduino Core, Microduino Shield BT4.0, supported Bluetooth 4.0 devices (iPhone4s upper,iPod touch 5 upper,iPad 3 upper,iPad mini upper)；
- Prepared software: Arduino IDE (1.0 release and upper), Microduino test program (Arduino part), download LightBlue from App Store；
- Start Arduino IED，open the Microduino test program, board type select "Microduino Core (Atmega328P@16M,5V)", download directly；
- Start to set the IOS device：
- start the bluetooth function on IOS device；
- Open LightBlue；
- In "Central" tab find the "HMSoft", then set "Service"-"Characteristics";
- Then you can see the debugging window, click the "Start Notify".
- ASCII data can be seen displayed: "BLE, Time: xxx" after connection success, where xxx is the Core and Shield BT4.0's running time in seconds.
Use Core 32u4 to debug Shield BT4.0
- Prepared hardware：Microduino FT232R,Microduino Core 32u4 and Microduino Shield BT4.0;
- Prepared software：Arduino IDE（1.0 releae and upper）, Microduino test program（Arduino part）;
- （32u4 can use USB to simulate the serial 0, but BT use 32u4's serial1 (RX0,TX1), so you can use the existing jumper(RX0,TX1)）;
- Start Arduino IED, open the Microduino test program, board type select "Microduino Core 32u4", download directly;
- Check if the serial communication works:
- Open the serial monitor, then send "AT" (No \r\n after AT), if return "OK", that means configure success.
Use Core+'s uart1 to debug Shield BT4.0
- Prepared hardware：Microduino FT232R, Microduino Core+, Microduino Shield BT4.0；
- Prepared software：Arduino IDE (1.0 release and upper), Microduino test program (Arduino part)；
- Other configuration：Suppose the player has changed the jumper which change the serial to D2、D3；
- Start Arduino IED, open Microduino test program, select the board type "Microduino Core (Atmega328P@16M,5V)", download directly；
- Check the serial communication：
- Open the serial monitor,send uppercase “AT”(no \r\n appened), if return “OK”，that means matched.
Note：If use the Android device to debug, in order to defect the BT module 4.3 release or upper is needed.
Microduino-Shield BT4.0 simple testing
Bug
History
- On June 5, 2013, the second time proofing is completed, changed its name to the "Microduino - (BT)" and added the third optional serial port - UART1, divided into 2 version, version 2.1, a module used for HM09;A 4.0 version, module used for HM10.
- On May 10, 2013, the board is completed.
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