CowGirl

Introduction

The CowGirl is a premium riding-style device with independent vibration and rotation motors. A special edition called "The Unicorn" uses the same BLE protocol. Both are manufactured by CowGirl.

BLE Profile

ble_names: ["THE COWGIRL", "THE UNICORN"]
services:
  - uuid: "0000fe00-0000-1000-8000-00805f9b34fb"
    characteristics:
      - uuid: "0000fe01-0000-1000-8000-00805f9b34fb"
        properties: [write]
        role: tx
        description: "Vibration and rotation control"

Commands

Vibrate and Rotate

A single 4-byte command controls both the vibration and rotation motors simultaneously. The Buttplug implementation always sends 0x00 for the first byte and 0x01 (constant pattern) for the second.

Format:

0xAA 0xBB 0xCC 0xDD

Byte	Description	Range
0xAA	Unknown	0x00-0x02
0xBB	Pattern	0x00-0x06 (see below)
0xCC	Vibration speed	0x00-0xFF (effective max ~0x90)
0xDD	Rotation speed	0x00-0xFF (effective max ~0x90)

Pattern values:

Value	Pattern
0x00	Off
0x01	Constant
0x02-0x06	Unknown patterns

Notes

• The maximum effective speed is around 0x90 (144). Values above this do not increase speed further.
• The first byte's function is unknown; the Buttplug implementation always sends 0x00.
• Both The CowGirl and The Unicorn use identical protocols.

Sources

• GitHub Issue
• Buttplug implementation