I wanted to share a pretty cool project we've been working on over at PubNub. We built an IoT coffee maker that monitors coffee pot levels in realtime and publishes that data to a live-updating web UI.
We used an Atmel ATmega328p MCU and an ESP8266, and transfer the capacity of the pot via PubNub. We've written a full tutorial, and all the code is open source.
The project in a nutshell:
And you can see it in-action here: