This applies to fans purchased from major retailers (Amazon, AliExpress) that advertise customizable software. These usually utilize a specific chipset (often Holtek or Cypress) hidden inside the USB plug.
Once you know the Vendor ID (VID) and Product ID (PID), you can send data directly. how to program usb led message fan
| VID:PID example | Protocol type | Structure | |----------------|---------------|------------| | 0x0416:0x5020 | Winbond HID | 64-byte reports, Report ID 0x02, raw bitmap | | 0x10C4:0xEA60 | Silicon Labs CP210x | ASCII text + 0x0D 0x0A terminator | | 0x1A86:0x7523 | CH340 serial | Binary protocol: 0x5A 0xA5 LEN MSG XOR_SUM | This applies to fans purchased from major retailers