Won't it just be.. black?

It will if you don't pop off the solar filter during the totality! I'm planning on practicing with the solar timer app mentioned by Smarter Every Day; I'm not moving anywhere since I'm in the path of totality (for 1:16!), so I want to make sure I have all the timing down for the little transitional bits, so I can gun off a dozen or so pictures at any of those moments.

I'll also have a timelapse camera set up on a wider angle (incorporating my yard, some trees, the sky, etc.) using pi-timelapse[1]

[1] https://github.com/geerlingguy/pi-timelapse

See ErrantAstro's excellent post in this thread, the "second factor": https://news.ycombinator.com/item?id=14547178