1. Connect his home devices (lights, thermostat, doors, music player, TV, CCTV etc) to his computer, so he can turn them on and off from it and in general automate his house from his PC.
2. Add an NLP component to his computer, so he could text instructions to it and it would apply the correct automation task. This can learn preferences too and be told about mistakes so it does better in the future.
3. Add face recognition, so it can recognise people at his door and automatically open it if they are expected.
4. Add speech recognition, by creating an app for the phone that is constantly on and listening for his voice. This is then converted to automation tasks again.
All in all, an interesting way to spend 100 hours. Calling it AI is a bit of a stretch though; this is basically linking up a bunch of in-accurate sensory parsers, coupled with some limited machine learning, connected to a bunch of if statements. Still a long way off of Jarvis, who is basically a genius by human standards!