My wife is supportive of my hobby(s) as long as it doesn't affect our family time.
I'm lucky that I only need about 5 hours of sleep, so I do most of my programming at night when wife and son are sleeping.
Sometimes she asks what I'm working on, but once I try to explain it she usually turns around and walks away
. She's not interested in technology at all and i don't think it's necessary. As long as you both respect each others personal time and hobby's there's no need for any conflict about this.