Hello guys , I want to ask what type of Raspberry Pi should I buy it ? And what size of giga ram is required ?
You can use any pi from Pi3 and up on Nybble.
Pi 3 A+ can fit Bittle better. Other models would be longer and the board needs to be tilted.
Pi Zero can also work.
What about the size of ram ?
It depends on the application you run on the Pi. A regular serial master script won't require much memory. A graphical or AI program may require more memory. 500M of Pi3A should be enough for regular experiments.