Keep a constant level of light in your room even as natural light changes.
Similar to auto brightness on a smartphone or tablet, have sensor based input adjust the level of room lighting based on the sensed level of light.
You might have many items, and it’s tedious to make a list.
An app that lets you take a picture of an item recognizes it and gives you all the details including price range. You can edit the details and add it to the inventory list.
So you don’t have to turn the pages of the sheet music yourself.
A tablet app that recognizes the music you are playing and automatically advances the sheet music on its display to match what you are playing now and will be momentarily.
For dirty environments and jobs.
Mass produce cheap conductive gloves that work with capacitive touchscreens
In some situations (putting the bike on the car), it’s useful if the front wheel and handlebar do not move.
Build a locking mechanism into the front wheel and handlebar. It will help when you need to pick up and move the whole bike and also deter thieves.