Bluetooth 3.0 Module with SPP Transparent Transmission/Compatible with HC-05,06 Slave Devices/JDY-31 Bluetooth Serial Module

Description The JDY-31 Bluetooth serial module, compatible with HC-05/06 slave devices, is designed based on Bluetooth 3.0 SPP (Serial Port Profile), enabling data transparent transmission with Windows, Linux, and Android systems. Operating in the 2.4GHz frequency band with GFSK modulation, it boasts a maximum transmission power of 8dB and a maximum transmission distance of 30 meters. Users can conveniently modify device names, baud rates, and other settings via AT commands, providing ease of use and flexibility. This Bluetooth module can only function as a Bluetooth slave device. Product Basic Parameters: Model JDY-31 Operating Frequency Band 2.4GHZ Communication Interface UART Operating Voltage 3.6-6V (5V recommended) Operating Temperature -40℃ – 80℃ Antenna Built-in PCB Antenna Transmission Distance 30 meters Master/Slave Support: Slave Module Dimensions 19.6 * 14.94 *1.8 mm(L x W x H) Bluetooth Version Bluetooth 3.0 SPP STM Soldering Temperature <260℃ Standby Current (Unconnected) 4.7mA Operating Current (Connected) 7.3mA Transmission Power 8db（max） Reception Sensitivity -97dbm SPP Maximum Throughput 16K bytes/s(android、windows)   Application Scope: The JDY-31, adhering to the classic Bluetooth protocol, can communicate with Bluetooth-enabled computers (desktops, laptops), and Android phones. It can be applied in various fields such as: Bluetooth serial port transparent transmission for Windows computers Bluetooth serial port transparent transmission for Android devices Smart home control Automotive OBD detection equipment Bluetooth toys Shared mobile power banks and weight scales Medical instruments Pin Function Description: STATE Connection status pin (low level when unconnected, high level when connected) RXD Serial input pin (TTL level) TXD Serial output pin (TTL level) GND Power ground VCC Power supply (supports 3.6-6V) EN Not used   Product Dimensions: Pin Interface: JDY-31 Supports Both SMD and Soldered Pin Headers Application of Pin Headers: The pin headers used are standard 2.54mm pitch, and only require soldering to 5 pin holes on the module. Application of Surface Mount Devices (SMD): Typically, only 4 pins need to be connected: VCC, GND, RXD, and TXD. If you need to actively disconnect while in a connected state, send “AT DISC” while connected. Pin Numbers Functions Descriptions 1 TXD Serial output pin (TTL level) 2 RXD Serial input pin (TTL level) 3 CTS 4 RTS 5 NULL 6 NULL 7 NULL 8 NULL 9 SWI 10 NULL 11 RST Reset (active low) 12 VCC Power supply (1.8-3.6V) 13 GND Ground 14 EN 15 ALED Broadcast status pin (flashes when unconnected, outputs high level when connected) 16 STAT Connection status pin (low level when unconnected, high level when connected) 17 SELECT 18 NULL 19 NULL 20 NULL 21 NULL 22 NULL 23 NULL 24 NULL   When sending AT commands via the serial port of the JDY-31 module, it is imperative to include the \r\n sequence. Below are the default functions of the commands Number Command Function Default 1 AT VERSION Version number JDY-31-V1.2 2 AT RESET Soft reset   3 AT DISC Disconnect (valid when in connected state)   4 AT LADDR Query the MAC address of the module   5 AT PIN Set and query the connection password 1234 6 AT BAUD Set and query the baud rate 9600 7 AT NAME Set and query the broadcast name JDY-31-SPP 8 AT DEFAULT Restore factory settings     Compatibility and Performance Comparison between JDY-30 and JDY-31: JDY-30 JDY-31 Working Current 19mA 7.3mA Transmission Rate 8KByte 16KByte   2 JDY-30 has slower search speed JDY-31 has faster search and connection speeds JDY-31 has obvious advantages   JDY-30 will be phased out and replaced by JDY-31 in the future.