WAVESHARE ELECTRONICS Pico-BLE Dual-Mode Bluetooth-compatible 5.1 Expansion Module User Manual

| 1、Data feedback is that Bluetooth feeds back various status and data information to the host, starting with
A brief introduction to commands

Functional| Command| Remark
Common  Command Features| AT+C?| The public command starts with AT+C, followed by “?” is the detailed function command
Bluetooth Command Features| AT+B?| The Bluetooth command starts with AT+B, followed by “?” is the detailed function command
Public inquiry| AT+Q?| The public query command starts with AT+Q, followed by “?” is the
Bluetooth query command| AT+T?| The Bluetooth query command starts with AT+T, followed by “?” is the detailed function command

Communication command example

Common Part–Control Instructions–Description

CMD| Corresponding function| Detailed description
AT+CT| Set baud rate| For detail see: Module baud rate setting and query
AT+CZ| Chip reset| Chip soft reset, see: Reset and restore factory

AT+CW

| Chip reset to factory settings| Restore factory settings, clear all previously memorized parameters, see: Module reset and restore factory settings

AT+CL

|

Chip low power settings

| See Chip low-power command description, the default is the normal working mode

AT+CR

| Chip power-on callback information settings| See: Chip power-on callback information setting, the default is open
AT+BM| Set BLE Bluetooth name| See: Set the name and address of Bluetooth
AT+BN| Set the MAC address of BLE| See： Set the name and address of Bluetooth
AT+BD| Set SPP Bluetooth name| See： Set the name and address of Bluetooth
AT+QT| Query the baud rate of the| See： Module baud rate setting and query
AT+QL| Query the low-power state| See: Set the name and address of Bluetooth
AT+TM| Query BLE Bluetooth name| See: Set the name and address of Bluetooth
AT+TN| Query BLE Bluetooth| See: Set the name and address of Bluetooth
---|---|---
AT+TD| Query SPP Bluetooth name| Seel: Set the name and address of the Bluetooth

Module baud rate setting and query

AT+CT??\r\n

| Baud rate setting command, ?? represents the serial number of the baud rate
---|---

AT+QT\r\n

| Baud rate query command, return QT+?? ?? represents the serial number of the baud rate
Baud rate serial number
01| 02| 03| 04| 05| 06| 07
9600| 19200| 38400| 57600| 115200| 256000| 512000
08| 09| 10| 11| 12| 13|
230400| 460800| 1000000| 31250| 2400| 4800|

1. Once the baud rate is set, the chip will memorize it. The next time you turn it on, the baud rate will be the one you set.
2. After setting the baud rate, please wait for 1 second, then send the reset [AT+CZ], or power off.
3. If you want to restore the default baud rate, please send the command to restore the factory settings, then the chip will automatically erase all configurations.

Module reset and factory reset

Reset command： AT+CZ\r\n
Please wait one second after entering the reset command

Factory reset command： AT+CW\r\n
Please wait five seconds after entering the factory reset command

Set the name and address of the Bluetooth

AT+BN112233445566\r\n

| Set the address of BLE. The address displayed on the mobile phone is: 66 55 44 33 22 11
AT+BDSPP-Waveshare\r\n| Set the SPP Bluetooth name to “SPP-Waveshare”

1. After setting the Bluetooth name, please reset the module, and use the mobile phone to search again after reset.
2. The maximum length of the Bluetooth name is 30 bytes
3. After modifying the Bluetooth name, if the device name displayed on the mobile phone does not change, the main reason may be that you have not modified the Bluetooth address, resulting in the mobile phone not being updated synchronously. At this time, what you need to do is to change the pairing information on the mobile phone. Delete and search again, or search with another device.

Query the name and address of Bluetooth

0xAA, 0x78, 0x56, 0x34, 0x12
AT+TD\r\n| Return to TD+SPP-Waveshare\r\n for Bluetooth name SPP-Waveshare

There is no SPP address whether it is set or queried, because the SPP address is obtained by +1 on the
highest byte of the BLE MAC address, for example:
The address of BLE is returned as: TN+32F441F495F1,
This means the address of BLE is: 0xF1 , 0x95 , 0xF4 , 0x 41 , 0xF4 , 0x32
Then the address of SPP is: 0xF2 , 0x95 , 0xF4 , 0x 41 , 0xF4 , 0x32

Chip low power instruction description

AT+CL00\r\n

| Do not enter low power mode. It will be valid at the next power-on. Be careful to restart the power after setting
---|---

AT+CL01\r\n

| Enter low power mode. It is valid at the next power-on. After setting, pay attention to power on again — the chip enters this state by default, no need to set

AT+QL\r\n

| Low-power query command. The return value is QL+01\r\n, indicating that the current working state is low power consumption mode

1. After setting, you need to power on again to update the configuration

2. This command is memorized. After the command is sent successfully, the chip will save it.

3. After starting the low-power mode, there are many restrictions, which are generally turned off by default.

4. After the setting, the chip will return to the device information normally when it is powered on. AT commands can be set within 5 seconds, and after 5 seconds, any AT commands will be ignored before the Bluetooth connection.

5. The difference between low power consumption and normal operation is mainly due to the difference in the way of Bluetooth broadcasts when Bluetooth is not connected. During normal operation, Bluetooth is always in the broadcasting state. During low power consumption, it broadcasts every 0.5 seconds, once every 0.1 seconds, and the rest of the time is in a sleep state. When connected to Bluetooth, the power consumption of the two working modes is similar (of course,
   the low power consumption will be a little lower),If it is not particularly sensitive to power consumption or it will be in a disconnected state for a long time after power-on, it is better to keep the module in a normal working state.

6. The following table is the current under each working state, which is measured in the experimental environment, and the results are for reference only.

| Serial number| Current| Description
---|---|---|---

AT+CL00\r\n

Low power working mode

|

Boot moment

|

12mA

| When the chip is powered on, the peripherals need to be initialized. The instantaneous current is relatively large, and this time is maintained for 300ms, and it enters a low-power state.

Working Status – Not Connected

|

1mA, 5mA

alternately

| The chip is in normal working state, broadcasts normally, and is in a periodic state of sleep, wake-up broadcast, and sleep. The purpose is to save power consumption, the cycle is 500ms. 100ms broadcast once, 400ms sleep

Working status – to connect

|

6mA

| When the connection is successful, the chip will no longer go to sleep. but at work

AT+CL01\r\n

normal working mode

|

Boot moment

|

25mA

| When the chip is powered on, the peripherals need to be initialized. The instantaneous current is relatively large, this time is maintained for 300ms, and it enters the 5mA working state

Whether connected or not

|

6.5mA

| The chip is always working. Small fluctuations in current, negligible

If you feel that the above power consumption is relatively high, you can use 3.3V to directly supply power to the module and the current will further

decrease

Chip BLE enable and SPP enables

T4+01 or T4+00
AT+T5\r\n| Check whether the SPP function is enabled. The chip will return T5+01 or T5+00

1. After the BLE/SPP function is turned off, it must be powered on again for this function to take effect. Of course it’s the same
2. You only need to set it once, the chip automatically saves the parameters, and you don’t need to set it next time
3. After the BLE/SPP function is turned off, the mobile phone cannot search for the name of BLE.

Description of the error message returned by the chip

you sent cannot be
| found
---|---
ER+3\r\n| The received AT command did not receive a carriage return and line feed, that is, \r\n
ER+4\r\n| The parameter sent by the command is out of range, or the command format is incorrect. Please check your AT commands
ER+7\r\n| The MCU sends data to the mobile phone, but the mobile phone does not open notify. In the successful state of BLE connection

Focus on the description of notify [monitoring]. After the test APP on the mobile phone is connected to the Bluetooth chip, notify must be turned on. The bluetooth chip can
send data to the mobile phone. When the mobile phone sends data to the Bluetooth chip,it is enough to use the write feature.

Chip power-on callback information settings

AT+CR00\r\n| Turn off postback messages for power-on. Be careful to restart the power after setting
---|---

AT+CR01\r\n

| Enable the return message of chip power-on. It is valid at the next power- on. Be careful to restart the power after setting

Note: After this function is turned off, it will also turn off the OK or ER+X return information that is actively returned after the AT command is executed. It is recommended to keep it turned on here.

Transparent transmission description

1. After the Bluetooth connection, the module automatically enters the transparent transmission mode. Except for the completely correct AT command, the rest of the data will be transparently transmitted.
2. The maximum amount of data that can be handled in a single time is 1024 bytes. SPP recommends that it should not exceed 512 bytes at a time.
3. The MTU (maximum communication packet length) of the mobile phone APP generally defaults to 20 bytes for 1 data packet; when the data packet sent by the module exceeds 20 bytes, the module will automatically divide the packet according to the set MTU; you can Modify the MTU to modify the data interaction speed (the larger the
   MTU, the faster the data interaction speed).

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