The SkyCamOne HATs provide dew heater control, 2 stepper motor interfaces (camera focus for instance), servo control, fan control, I2C sensor interfaces and NVMe M.2 drive for improved storage capabilities.
The heart of any all sky camera!

Then more info you get! This is an extra hardware layer on top of a Raspberry Pi mini-computer. It is aimed at all sky cameras, the type of camera that makes time-lapse videos of the night sky, during the entire night between sunset and sunrise, from horizon to horizon using a wide angle lens.