HN hasn't focused on those topics in a long time, they rarely are on the front page. Skip the top 20 articles and you'll start to see some interesting content instead of all the VC & AI drivel.

Hackaday is a content aggregator site that usually has more content on these topics - https://hackaday.com

Or there are still some good old blogs out there with RSS feeds http://www.righto.com/ http://oldvcr.blogspot.com/ https://blog.ret2.io/