Servo pHAT for Raspberry Pi
The SparkFun Servo pHAT allows your Raspberry Pi to control up to 16 servo motors in a straightforward and uncomplicated manner via an I2C connection. Additionally, the Servo pHAT adds a serial terminal connection, which will allow you to bring up a Raspberry Pi without having to hook it up to a monitor and keyboard.
Power to the SparkFun Pi Servo HAT is supplied by a USB-C connector that can be used to power the servo motors only, or to power the servo motors as well as the Pi that is connected to the HAT.
More information can be found on the website of Sparkfun.