Build an IoT coffee pot with realtime capacity monitoring. via instructables
Sometimes, a product is so simple, so obvious, you wonder why no one has created it yet. That’s kind of the story here… Everyday at work, I listened to countless people complaining that the coffee pot was empty. The collective voice of the people rang out with demands of change! They wanted to know if the coffee pot was empty before they went to the kitchen to get some, to know if they needed to stop somewhere on their way to work because no one had started a new brew. Lucky for them, we live in the dawning of the age of IoT, and I just happen to be a herald.
Given that my office uses insulated, metal pots rather than the typical glass ones, I elected to measure the weight of the pot rather than see how much coffee is left using optical sensors. Note, this will not work for coffee makers with an exposed hot plate! To accomplish this, I hacked into a cheap digital kitchen scale to pirate data about the weight of an object and publish that data to the internet using PubNub.