Bluetooth products are widely used, and observant individuals may notice that they all use the same module. That's right - it's the wireless Bluetooth module. The Bluetooth module greatly facilitates design engineers, and of course, different companies develop their own versions of Bluetooth modules. The main principle behind Bluetooth is that it is a short-range 2.4GHz wireless technology, and as technology advances, long-range Bluetooth modules have also been developed.

Bluetooth modules come in various sizes. One of Shenzhen Dongdao Technology's clients purchased a module that was too large. They approached Shenzhen Dongdao Technology and requested a smaller module with identical functionality, similar to the one shown in the image above. Shenzhen Dongdao Technology first performed PCB cloning and then reverse-engineered the schematic. Next, they redesigned the module based on the CAD dimensions provided by the client. The final result was particularly good. Below are the specifications of the Bluetooth module for reference:

Main Chip: CSR BC04 External Bluetooth Specification: v2.0 Compliant + EDR Bluetooth Applications: HSP, HFP, PBAP, SPP, OPP, HCI, HID, etc. Output Power: Class 2 Application Interface: PIO, AIO, UART, USB, PCM, UART Protocol Support: A2DP, AVRCP, PBAP, DUN, FTP, GAP, GAVDP, GOEP, HCRP, HF1.5, HID, OPP, PAN, SP Power Supply Voltage: 3.3±0.1V Built-in 8Mbit Flash Supports Low Power Modes: Park, Sniff, Hold, and Deep Sleep