l live in the same house as my 92 years old grandmother. She does her stuff, but needs help to move around, so i get her food for her and various things. However, when she needs something, she has to call me, and i'm not always paying attention to my phone. I want to develop a compact wifi system that she can carry with her and use to call me. The portable system will be a set of buttons, each with a function (need help, not urgent, moderately urgent, or help right now, emergency, for instance). Over the house wifi, the goal is to have it communicate with me in multiple ways, such as lighting LED to warn me. I'd put some LED on her device to inform her that i'm coming (with a button on my side).
I'd like to have it compact and low power enough to be able to be carried all around. I may try to make it water resistant too.