Raspberry Pi Zero 2 W offers 2.4GHz 802.11 b/g/n wireless LAN and Bluetooth 4.2, along with support for Bluetooth Low Energy (BLE), and modular compliance certification. The board has a microSD card slot, a CSI-2 camera connector, a USB On-The-Go (OTG) port, and an unpopulated footprint for a HAT-compatible 40-pin GPIO header. It is powered via a micro USB socket. Video output is via a mini HDMI port; composite video output can easily be made available via test points if needed. Sharing the same form factor as the original Raspberry Pi Zero, Raspberry Pi Zero 2 W fits inside most existing Raspberry Pi Zero cases.
16 Channel Servo Driver HAT for Raspberry Pi is a servo driver HAT from which one can control up to 16 servo's simultaneously. If you're building a robot with a lot of moving parts, or if you need to monitor a lot of Servo motors with PWM yields, the microcontroller's limited PWM yields will be a big problem. The most important thing you can do to solve this problem is to obtain a 16-Channel 12-Bit PWM/Servo Driver.
With the 16-Channel 12-Bit PWM/Servo Driver, you can power 16 free-running Servo motors with only two pins. 62 breakouts can be fastened together to power up to 992 PWM outputs. It's a PWM driver with an implied clock that's powered by I2C.