IoT presentations usually focus almost to the exclusion of everything else on hardware, missing out on the big picture. In fact what is called IoT should be called AoT, for API of Things. Since APIs are what enables to extract value from the abundance of cheap sensors and bridging devices. In this presentation, we'll set up a noise sensing system that will allow us to extract a noise profile for an office or factory environment end-to-end, i..e, from the sensor to the dashboard. We'll also delve into the necessary steps for taking this quick and cheap prototype -- under 30 EUR -- to an industrial strength solution, addressing end-to-end security and scalability. Antonio Almeida