I really like the price point of the ESP8266 and the ease of use it offers tinkerers to add wifi to their projects and in particular the Arduino.
I have an issue with topping up from evaporation in my aquarium so I decided to hook up a system (designing a pcb and software from scratch) that not only tops up the aquarium when it’s running low, but can send me an email before its resivour is too low.
On top of that it can monitor (and log online, I’m using thingspeak.com) the temperature. One other nice thing it can do is tell me when I need to empty my protein skimmer collection cup – without having to open the cupboard door.
Here’s what the prototype looks like: