This case study offers an entertaining way to learn about the possibilities of stream processing, which can be applied to projects in fields that require easy access to current information, such as finance, mobility and energy. We’ll use the Quix platform to set up a series of open source data sets and code samples that collect, transform and deliver data under a machine learning model that learns to handle real-time heart rate data. We’ll show how to include complex transformations to the data, such as how to calculate calories burned with Python.