The first component I looked at was a liquid sensor.
this sensor uses infrared lights to detect whether or not a liquid is present. I can’t think of any use I would have for this but I do think that it is a very interesting sensor and could have tons of potential uses from warnings of flooding to simple ways to check levels of water in places that aren’t visible.
I really liked the idea of sensors that are worn on the body that could detect things like heart rate and muscle movement. I think it would be very cool to make some sort of wearable that reacts to your heart rate or muscles instead of some other type of user interface. Alternatively I would like to make some sort of light fixture that could be controlled remotely by body motions or would react to changes in heart rate.