Introduce the characteristics and uses of Bluetooth and how to use the ZLG9021 Bluetooth module produced by our company for product development.
1 Bluetooth
Bluetooth: A wireless technology standard that enables short-distance data exchange between fixed devices, mobile devices, and building personal area networks. It operates in the 2.4-2.485 Ghz radio band.
2 low power Bluetooth
Bluetooth Low Energy: Following the standard Bluetooth specification, low-power Bluetooth, which uses fast connections, maximizes standby time, and low peak transmit or receive power consumption, reduces power consumption of Bluetooth by 90% compared to traditional Bluetooth.
3ZLG9021P0-1-TC Bluetooth Features
The ZLG9021P0-1-TC Bluetooth module uses QN9021 as the main control chip and follows the Bluetooth 4.0 low-power Bluetooth specification. Its features are as follows:
Reliability: with error detection and correction, data encoding and decoding, data noise, adaptive frequency hopping, etc.
Power consumption: 1.4mA in the 200ms broadcast cycle operation mode and 137μA in the sleep mode
Connection time-consuming: 20ms~300ms (related to specific scenarios)
Transmission distance: the limit communication distance can reach 60m~80m
Transmission rate: theoretical maximum transmission capacity of 5.5KByte/s
4 How to use ZLG9021P0-1-TC Bluetooth module for product development?
First, the module level application
The ZLG9021P0-1-TC Bluetooth module comes with its own transparent transmission function firmware. Some of its functions are as follows:
1. Using universal serial port design, half-duplex two-way communication, support baud rate minimum 4800bps, maximum 115200bps;
2. Support AT command software to reset the module and obtain the MAC address;
3. Use the AT command to modify the Bluetooth connection interval to control different forwarding rates;
4. Support AT command to adjust the transmit power and change the signal strength;
5. Support AT command to modify the broadcast interval, set the data delay (user MCU serial port receiving preparation time), modify the serial port baud rate and modify the module name operation, these parameters can be saved after power down;
6. The serial port data packet length is 20 bytes or less (including 20bytes) of any length, and the large packet is automatically sub-packaged;
7. Support RESTORE pin grounding 10s to restore factory settings;
8. The Bluetooth connection status (connection, disconnection) string prompt can be obtained through the serial port;
9. The low power mode of the module can be obtained through the level state of the I/O port;
10. Support the function of the EN pin ground enable module;
11. Support AT command or EN pin control to enter the very low power standby mode;
12. BLE data transmission encryption.
Second, module level development
The ZLG9021P0-1-TC Bluetooth module supports secondary development, and the signal is stable, which can greatly reduce the workload of circuit design. In addition to this, a wealth of routines and various development tools are available.
1. Provide NXP official SDK software development kit QBlueStudio
2. Provide rich Bluetooth related routines
3. Provide various development tools
4. And various mobile applications
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