Can technology make you happy?

In IEEE Spectrum, "Can technology make you happy?",http://spectrum.ieee.org/at-work/innovation/can-technology-make-you-happy, it has a few interesting findings. If you write down a few positive achievements in a week, you feel more energetic and ebullient. Positive engagement with the other people is another balancing act to, at least temporarily, assuage your somber mood. All these mental states can be quantitatively correlated to the digital signatures on the miniature devices held by a cord around your neck. But do I need a machine to remind me if I am happy or not?