One way to build out a smart home is to buy lots of components—sensors, smart bulbs, security cameras, speakers, and whatnot—and connect them all to a hub that helps them communicate with each other and with you, via your smartphone.But let’s be real: That can involve spending a lot of money and investing a lot of time. And for some people, it’s just overkill. If your wants and needs are simpler, just a few relatively inexpensive products will deliver most of the conveniences a high-end smart home can deliver, and on a much more modest budget.