PCA9685 I2C Port Selection

Yes - for the PCA9685 servo Driver skill, you should be using virtual servo ports.

What to select

• PCA9685 channels map to V0 through V15 by default
• If you add more than one PCA9685 skill instance, you can assign another window like:
  • V16-V31
  • V32-V47, etc.

Important clarification

The I2C connection is between the EZB v4 and the PCA9685 board.
You do not select the PCA9685 as an I2C port inside the skill. Instead:

• ARC connects to the EZB v4
• The PCA9685 skill uses the EZB’s I2C bus
• You command the servos with virtual servo ports

In the PCA9685 skill settings

Open the skill’s kebab/hamburger menu and check:

1. I2C Address
   • Most boards default to 0x80 in ARC’s 8-bit format
2. Port Range
   • Leave it at V0 - V15 for one board
3. Min s / Max s
   • Defaults are usually fine to start

If nothing responds, check these first

• PCA9685 has its own servo power
  • The servo rail should be powered by a separate 5-6V supply
• Common ground is connected
  • PCA9685 GND must be tied to EZB GND and servo power GND
• I2C wiring
  • SDA to SDA
  • SCL to SCL
• Board address matches the skill
  • If the address jumpers were changed, ARC must match that address
• You see the init message
  • The skill should initialize on connect, typically something like:
    • Initialized PCA9685 @ 0x80

Best test

Try commanding a single servo on V0 first.

Reference

• PCA9685 servo driver skill:
  https://synthiam.com/Support/Skills/Servo/PCA9685-Servo-Driver?id=23154
• PCA9685 hardware guide:
  https://synthiam.com/Support/Hardware/PCA9685-Servo-Controller

If you want, I can help you verify the exact I2C address and skill configuration step by step.