id8 Group R2 Studios was started in 2011 by Silicon Valley entrepreneur and investor Blake Krikorian. It recently launched a Google Android application to allow users to control home heating and lighting systems from smartphones.
Krikorian's Sling Media - which was sold to EchoStar Communications in 2007 - made the "Slingbox" for watching TV on computers.
Krikorian will join Microsoft with a small team, according to the Wall Street Journal, which reported the acquisition earlier on Wednesday. Microsoft also purchased some patents owned by the start-up related to controlling electronic devices, the newspaper added.
Krikorian and a Microsoft spokesman declined to comment.
Krikorian resigned from Amazon.com Inc's board in late December after about a year and a half as a director at the company, the Internet's largest retailer.
(Reporting By Alistair Barr; Editing by Steve Orlofsky)
By Alistair Barr