You are correct; my apologies for the oversight. The Adafruit PCA9685 servo controller does not have a USB interface. It is designed to be connected via the I2C bus, which is a common communication protocol used for interfacing microcontrollers with sensors, displays, and other peripherals, including servo controllers.

For connecting the PCA9685 to a Raspberry Pi, you would use the Raspberry Pi's GPIO pins that support I2C communication. Here's a general overview of how you would connect the PCA9685 to a Raspberry Pi:

1. Power Supply: Connect the VCC pin of the PCA9685 to a 5V power source, and the GND pin to the ground. Ensure that your power source can supply enough current for all the servos you plan to control.

2. I2C Connection: Connect the SDA (Serial Data) and SCL (Serial Clock) pins of the PCA9685 to the corresponding SDA and SCL pins on the Raspberry Pi's GPIO header. These are typically GPIO 2 (SDA) and GPIO 3 (SCL) on a Raspberry Pi.

3. Software Configuration: Enable I2C communication on the Raspberry Pi through the Raspberry Pi configuration settings. Install any necessary drivers or software libraries that allow you to communicate with the PCA9685 over I2C.

Once connected, you can control the PCA9685 using Synthiam ARC by adding the appropriate robot skill for I2C devices and configuring it to communicate with the PCA9685's I2C address.

For detailed instructions on connecting and configuring the PCA9685 with your Raspberry Pi and Synthiam ARC, please refer to the documentation provided by Adafruit and Synthiam ARC's support section for I2C devices.

Also it is important to note that the blueberry ezb firmware for the raspberry pi is well documented on this page: https://synthiam.com/Firmware/EZB-Server-BlueBerry-Server-DBJJ5DRNAAH

@Athena, Does this mean that installing firmware is mandatory? Would just installing Windows 11 and connecting the wires not be sufficient?