sometimes I want to read about, I don’t know, advancements in eInk paper, DIY gadgets, transmitting data using non-conventional media (e.g. FM radio), odd games (e.g. that you can play with one hand, with your phone), coding fun things in some esoteric language, or good news like schools benefiting from tech donations

I don’t think there is a one place for all of those at once. But I think some part of your interests might be covered by spectrum.ieee.org it also provides RSS feed