Grove - BLE (dual model) v1.0
Introduction
3.3V 5.0V UART
Grove - BLE (dual model) v1.0 uses CSR dual mode Bluetooth chip. The chip is
based on ARM architecture and supports AT instructions. Users can develop flexibly
according to the serial baud rate, equipment name, pairing password.
Features
• BT Version: Bluetooth Specification V4.0 & BLE
• UART send and receive max bytes is 512
• Other device to module in SPP mode: 90 Bytes per packet
• Other device to module in BLE mode: 20 Bytes per packet
• Two data transmission mode, balance mode and high speed mode
• Working frequenc y: 2. 4GH z ISM band
• Modulation method: GFSK(Gaussian Frequency Shift Keying)
• RF Power: -23dbm, -6dbm, 0dbm, 6dbm.
• Speed: As ynchronous: 3K Byt es
• Synchronous: 3K By t es
• Security: Authentication and encryption
• Service: Slave SPP, Peripheral BLE, UUID FFE0,FFE1
• Power: +3 .3/ + 5. 0VD C 5 0m A
• Long range: SPP 30 meters, BLE 60 meters
• Power: SP P 13 .5m A, BLE 9.5m A
• Working temperature: –5 ~ +65 Centigrade
Tip
Raspberry
Pi
LinkIt
ONE
More details about Grove modules please refer to Grove System
Platforms Supported
Arduino Wio BeagleBone
Caution
The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only
provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library /
demo code for all possible MCU platforms. Hence, users have to write their own software library.
Hardware Overview
K2: During connected status, it could be disconnected by pressing K2 button more
than 100ms. During sleep mode, it could be restored through pressing K2 (factory
settings) button.
U1: U1 is the wireless module, it includes automatic power on reset circuit.
D1: The LED works in two mode: Sleeping is indicated by flashing slowly
and Connected status indicated by continuous illumination.
J1: The standard Grove connector.
Caution
BLE transmission speed is slower than SPP transmission, so we selected the lower one in
the design, in accordance with the speed of a BLE dual-mode product pla nning.
Hardware Installation
Connect in g Bluetooth to PC through UART B e e
The Bluetooth provides a serial port with standard Grove socket, most USB-UART
converter can be used. Here we use a UartSBee V5 to connect Bluetooth and PC.
Connecting Bluetooth to Ard uino
Since Arduino Uno have no Grove socket, we use Seeeduino Lotus instead. You
could use Arduino with Grove Base Shield V2 as well. As an example, D2 and D3
are used as software UART. So, plug the Grove cable into “D2” socket
Send
Receive
Parameter
AT
OK/ER/Disconnect link
None
Software Instructions
Conventions
• In EDR mode, only slave can be configured while either master or slave can be in BLE
mode.
• Factory d e fa ul t set ting:
o EDR Name HMSoft, Slave role, PinCode 1234
o BLE Name HMSoft, Slave role, PinCode 000000
o Baud: 115200, N, 8, 1;
• AT Command format:
o Uppercase AT command format. string format, without any other symbol. (e.g. \r or
\n).
o Any incorrect command would get no response.
AT Commands
1. Test Command
If module is not connected to remote device will receive: “OK”
If module has an error, will receive: “ER”
If Module has connected, module will disconnected from remote device, if “AT +
NOTI” is setup to 1, will receive information string
2. Query module EDR address
Send
Receive
Parameter
AT+ADDE?
OK+ Get: MAC
None
Send
Receive
Parameter
AT+ADDB?
OK+ Get: MAC
None
Send
Receive
Parameter
Q: AT+AUTH?
OK+ Get:[P1]
P1: 0, 1, (Default: 0) 0 – Not
authentication
S: AT+ AUTH[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+ATOB?
OK+ Get:[P1]
S: AT+ ATOB[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+BAUD?
OK+ Get:[P1]
P1: 1~7, (Default: 6). 1 - 4800 2 –
57600 6 – 115200 7 - 230400
S: AT+ BAUD[P1]
OK+ Set:[P1]
Send
Receive
Parameter
3. Query module BLE address
4. Que r y/Set Authentication mode
authentication 1 – Must
AT+AUTH0: allow made an insecure connection. AT+AUTH1: every connection must
with authentication.
5. Query/Set A to B mode
P1: 0, 1, (Default: 0) 0 – Not Open
ATOB 1 – Open ATOB mode
This command must work with AT+MODE0 command. When A device (SPP mode)
connect to the module and B device (BLE mode) is also connect to the module, The
data string from A device send to the module will send to B device. The data string
from B device send to the module is also send to the A device.
6. Query/Set baud rate
7. Clear bond information
9600 3 – 19200 4 – 38400 5 –
Send
Receive
Parameter
AT+BONDE
OK+BONDE
Clear EDR bond info
AT+BONDB
OK+BONDB
Clear BLE bond info
BLE mode not supports it yet.
Send
Receive
Parameter
AT+CLEAE
OK+CLEAE
None
Send
Receive
Parameter
AT+CLEAB
OK+CLEAB
None
Send
Receive
Parameter
Q: AT+DUAL?
OK+ Get:[P1]
S: AT+DUAL[P1 ]
OK+ Set:[P1]
Send
Receive
Parameter
AT+FIOW?
OK+ Get:[P1]
P1: 0, 1,(Default: 0) 0: Hardware
control on
AT+FIOW[P1]
OK+ Set:[P1]
Send
Receive
Parameter
AT+HIGH?
OK+ Get:[P1]
AT+HIGH[P1]
OK+ Set:[P1]
8. Clear Last Connected EDR Device Address
9. Clear Last Connected BLE Device Address
10. Query/Set Module DUAL Work Mode
P1: 0, 1, (Default: 0) 0 – Allow dual
connect. 1 – Allow one connect.
AT+DUAL0: allow two connections at same time (SPP and BLE). AT+DUAL1: Only
allow one connection at same time (SPP or BLE)
11. Query/Set hardware flow control switch
flow control off 1: Hardware flow
12. Query/Set module data transmission speed mode
P1: 0, 1,(Default: 0) 0: Balance
mode 1: High speed mode
In balance mode, we balanced SPP and BLE with a steady speed. In high speed
mode, we don’t control speed, so SPP mode will got high speed. In high speed
mode, module lost RESETB pin function, but you still could use “AT+RESET”
Send
Receive
Parameter
AT+HELP?
Help Information
None
Send
Receive
Parameter
AT+INIT?
OK+ Get:[P1]
AT+INIT[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+MODE?
OK+ Get:[P1]
S: AT+MODE[P1]
OK+ Set:[ P1]
Send
Receive
Parameter
Q: AT+NOTI?
OK+ Get:[P1]
S: AT+NOTI[P1]
OK+ Set:[ P1]
command to reset module.
13. System Help Information
14. Query/Set module loaded notify
P1: 0, 1,?, (Default: 0) 0: Loaded
notify 0ff 1: Loaded notify on
When “AT+INIT1” is setup, after module loaded, module will output “OK+INIT” string
through UART.
15. Query/Set Module Work Mode
P1: 0, 1, (Default: 0) 0 – Data
transmission. 1 – Remote control.
AT+MODE0: Only transfer data when connection establishment. AT+MODE1:
Transfer data and response AT commands.
16. Query/Set Notify information
P1: 0, 1, (Default: 0) 0: Don’t Noti fy
1: Notify
After AT+NOTI1, module will send connect or disconnect string through UART when
module state is changed:
OK+CONE ======== EDR connect
OK+LSTE ========= ED R disconnect
OK+CONB========= BLE c onnect
OK+LSTB ========= BLE disconnec t
Send
Receive
Parameter
Q: AT+NOTP?
OK+ Get:[P1]
Q: AT+NOTP[P1]
OK+ Set:[ P1]
Send
Receive
Parameter
Q: AT+NAME?
OK+ Get:[P1]
Q: AT+NAME[P1]
OK+ Set:[ P1]
Send
Receive
Parameter
Q: AT+NAMB?
OK+ Get:[P1]
S: AT+NAMB[P1]
OK+ Set:[ P1]
Send
Receive
Parameter
Q: AT+PIO1?
OK+ Get:[P1]
P1: 0, 1 0: Unconnected Output
Default: 0
Send
Receive
Parameter
Q: AT+PIO[P1]?
OK+ Get:[P1][P2]
P1: 2~B (HM-12) P2: 2~3 (HM-13)
Query
S: AT+ PIO[P1][P2]
OK+ Set:[P1][P2]
OK+LSTA ========= except disconnect, module will reset after 500 ms.
17. Query/Set notify mode
P1: 0, 1; default: 0 0: without
address 1: with address
This command must work with “AT+NOTI1”, if this switch is open, when the module
connect to disconnect, the prompt string will include the remote address.
18. Query/Set Module EDR name
19. Query/Set Module BLE name
20. Query/Set PIO1 output status (System LED)e
S: AT+ PIO1 [P1] OK+ Set:[ P1]
21. Query/Set PIO output status
P1: module EDR name, Max length
is 12. Default: HMSoft
P1: module BLE name, Max length
is 12. Default: HMSoft
500ms High 500ms Low, Connected
output High. 1: Unconnected output
Low, Connected output High.
22. Query/Set EDR Pin Code
0: Output Low 1: Output High ?:
Send
Receive
Parameter
Q: AT+PINE?
OK+ Get:[P1]
S: AT+ PINE[P1]
OK+ Set:[P1]
23. Query/Set BLE Pin Code
Send
Receive
Parameter
Q: AT+PINB?
OK+ Get:[P1]
S: AT+ PINB[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+PARI?
OK+ Get:[P1]
S: AT+ PARI[ P1]
OK+ Set:[P1]
Send
Receive
Parameter
AT+RENEW
OK+RENEW
None
Send
Receive
Parameter
AT+RESET
OK+RESET
None
P1: RSSI value
Xxxx: RSSI value
24. Query/Set UART parity bit
25. Restore all setup value to factory setup
P1: module EDR Code Max length:
6 Default: 1234
P1: module BLE Code
000000~999999 Default: 000000
P1: 0, 1, 2, (Default: 0) 0: Parity
None 1: Parity even 2: Parity odd
26. Restart module
27. Query BLE RSSI value
Send Receive Parameter
9999: No connection
AT+RSSB? OK+RSSB: [P1]
9998: Try later
9997: Read error
This command must use after “AT+MODE1” is setup. This command is only used by
remote Bluetooth device.
28. Query EDR RSSI value
Send Receive Parameter
P1: RSSI value
Xxxx: RSSI value
Send
Receive
Parameter
AT+RADE?
OK+Get:MAC Address
None
Send
Receive
Parameter
AT+RADB?
OK+Get:MAC Address
None
Send
Receive
Parameter
AT+ROLB?
OK+ Get:[P1]
AT+ROLB[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+SCAN?
OK+ Get:[P1]
P1: 0, 1, (Default: 0) 0: Discovery
connectable
S: AT+ SCAN[P1]
OK+ Set:[P1]
Send
Receive
Parameter
Q: AT+STOP?
OK+ Get:[P1]
S: AT+ STOP[P1]
OK+ Set:[P1]
AT+RSSE? OK+RSSE: [P1]
29. Query Last Connected EDR Device Address
30. Query Last Connected BLE Device Address
9999: No connection
9998: Try later
9997: Read error
31. Query/Set Master and Slaver Role
This command will take effect after module next power on or reset.
32. Query/Set EDR work mode
33. Query/Set UART stop bit
P1: 0, 1 (default: 0) 0: Peripheral 1:
Central
and connectable 1: Only
34. Query Software Version
P1: 0, 1, (Default: 0) 0: 1 stop bit 1:
2 stop bits
Send Receive Parameter
AT+VERR?
AT+VERS?
Version Information None
Programming
Configure the Bluetooth module w ith Serial under Windows
This section shows how to configure Bluetooth with PC, some basic methods of
setting could be learn. Set up hardware connection refer to “Hardware Installation”
section. You will find the blue LED on the module flashes illustrate no connection is
set up.
Open a serial terminal and set Baud Rate:115200, Databits: 8, Stopbits: 1 and No
Flow Control. Send “AT” to Bluetooth with the serial terminal and “OK” will be return if
all goes well. The Bluetooth only respond AT commands when no connection was set
up, or all commands were seen as string and sent out. You can distinguish the status
through LED indicates.
Then some useful configurations could be sent. Here are some samples of
commands and responses.
1. Test serial connection, send “AT”, will return “OK”.
2. Restore factory settings, send “AT+RENEW”, return “OK+RENEW”.
3. Reset baud rate of serial port, send “AT+BAUD2”, return “OK+S et:2”.
4. Enable authentication, send “AT+AUTH1”, return “OK+Set:1”.
5. Reset the Bluetooth, send “AT+RESET”, return ”OK+RESET”.
6. Query firmware version, send “AT+VERS?”, return “OK+Get:HMSoftV217”.
7. Query MAC of EDR, send “AT+ADDE?”, return “OK+Get:000E0E002074”.
8. Query MAC of BLE, send “AT+ADDB?”, return “OK+Get:000E0B002074”.
9. Set the name of EDR, send “AT+NAMEHM-13-EDR”, return “OK+Set:HM-13EDR”.
10. Set the name of BLE, send “AT+NAMEHM-13-BLE”, return “OK+Set:HM-13-BLE”.
11. Set the password of EDR, send “AT+PINE123451”, return “OK+Set:123451”.
12. Set the password of BLE, send “AT+PINB123451”, return “OK+Set:123451”.
13. Enable discovery and connectable, send “AT+ S CA N0”, return “OK+Set: 0”.
14. Enable notify information of connection, send “AT+NOTI1”, return “OK+Set:1”.
15. Notify information include address, send “AT+NOTP1”, return “OK+Set:1”.
16. Enable user key, send “AT+PIO01”, return “OK+Set:1”.
17. Set to Central mode, send “AT+ROLB1”, return “AT+ROLB1”.
Or Set to Peripheral mode, send “AT+ROLB0”, return “AT+ROLB0”.
We use two Bluetooth connected with PC, one was set as Central while the other is
Peripheral. Several seconds later they find each other and the LED stop flash,
connected!
Commun icate with iPhon e
This kind of Bluetooth module has two protocol: Bluetooth EDR(Enhanced Data
Rate) and Bluetooth Low Energy. It can communicate with any device that has one of
these protocols. Some Android phone with OS higher than 4.3 and iPhone4 or later
have BLE ability. We use a iPhone to demonstrate how to use a cellphone to interact
with Bluetooth.
Power the Bluetooth and configure it as Peripheral role. Search LightBlue in Apple
Store and install it. Launch the app, you may find “HM-13-BLE” which we just
renamed. Touch it to connect, then touch “Propert ies” to contro l it. The key “Hex” on
the top right is for change data format, maybe String is easy to see. Hit “Listen for
notifications” to enable data receiving. Then we can send data to PC through BLE, hit
“Write new value” and write some words. Also PC can transfer data to iPhone with
serial terminal.
Data transmission between Tw o Ar duinos
Are you ready to code? It’s time to do something after practice. Prepare a pair of
Bluetooth, and Arduino or other platform to control them. Here we use two Arduino
Uno. Set up the connection as mentioned in section “Hardware Installation”.
The program of Central and Peripheral use the same code, the only difference is the
micro define at the beginning of the program. To assign the Bluetooth to Central role,
Just need to modify the text to “#define MASTER 1”, or “#define MASTER 1” if
Peripheral role was assigned.
The initialisation program flow please refer to the following flow chart. First of all we
need to distinguish the presetting baud rate of the Bluetooth. After this, send
commands to restore factory settings, and change baud rate from 115200 to 9600
since software serial will not working well at high baud rate. Then other parameters
were configured to the Bluetooth with Reset command in the final.
After the initialisation, the Central and Peripheral will do different things, the Central
will send message to Peripheral interval and print what received from Peripheral
while the Peripheral only responds the Central.
Click here to download the test code and open HM-13_SW.ino with Arduino IDE,
compile and download to Arduino Uno. Remember to configure the Bluetooth to
different role by modify the macro at the beginning. If you have any problem about
how to start Arduino, please click here for some help.
After downloading program, open two serial terminal windows, the LEDs on Bluetooth
will flash, several seconds later, they stop to flash and keep on, this indicates that
they connected to each other. According to the program is written, the Central sends
message to the Peripheral continually and get feedback every time.
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