First of all, focus on the product, rather than the technology. When it comes to product, you need to identify a real customer pain or problem that is being unaddressed. The best source of inspiration are problems that you face for which you cannot find a solution.
To evaluate if this is a real problem, find others who have it. A good place to start for identifying how important a problem is to solve is with Abraham Maslow's hierarchy of needs. The needs nearer the bottom are generally easier to sell: Thus, Sex, Food and Medicine are easier to sell than lectures on morality.
After you have identified a real problem and solution, it is time to validate whether there is a business you can build around the solution.
Let me know if you want to walk through evaluating your idea.