I’m currently working on a more complex project that uses double sided assembly (and a weird USB-C connector). To practice these things a little, I ordered some low cost boards to get used to that connector and explore double sided reflow (which seems easier than I expected).
For those who are interested, this is a reference design from framework computer for their expansion card system. It can be programmed with circuitpython or Arduino and utilises a SAMD21 microcontroller.
Nice! Thanks for explanation! I don't have much experience with soldering larger circuits. Usually I'm stuck with a soldering iron and tweezers. Just recently got a used stereo microscope. That already helps a lot. But certain packages like BGA are out of reach this way.
I was kind of afraid of SMD things in general a long time but I discovered they are (up to a certain size, 0603 is still okay for hand assembly if you’re patient) comfortable to work with. Even QFN packages are okay if you have access to a hot-air station. I did actually order an BGA sensor out of curiosity along with other things, looked at it and was like “hahaha, thanks, I probably better don’t design that thing into my circuit” (I think it’s a 5-WLCSP package).