Select Your Hardware
All you need to have is a Raspberry-Pi board. You can use RPI 2,3,4 & Zero/Zero2. This board model determines the capabilities of your system. Using RPI-4 enables you to run video streaming module from multiple cameras. This module allows you to connect multiple cameras and stream from them simultaneously.
If you need a telemetry then RPI-Zero is a perfect fit.
Raspberry-PI Zero 2 W has been available since last quarter of 2021. It has a quad-core, and is 5 times more powerful than Raspberry Zero W. This is your best choice if you want to use a single camera for FPV. You can select it by select it to save power and weight. RPI-4 will be your option if you want multiple cameras and for future more sophesticated modules.
It is recommended to have RPI-Zero for telemetry only and RPI-4 for telemetry + streaming video.