Challenge - Most of the time we usually over or under water our plants.
So, we build Quench, a solar powered soil moisture sensor which can be easily fixed in your gardens and will give you the ability to control the amount of water needed by the plants.
There is a LED which glows according to water content in the soil.
If amount of water is less, then LED will glow RED. If medium, then BLUE; If amount of water is enough, then LED will glow GREEN.