The Physical Computing course at the ZHdK Interaction Design bachelor program teaches basic understanding of electronics and working with the Arduino platform. In this years course we put an emphasis also on the Internet of Things and the realm of connecting objects with each other and exchange data. As part of the course, the students have been introduced to the shiftr.io prototyping platform which provides the infrastructure for interconnecting artifacts. While the students learned the basics in the first two weeks, the final exercise was to build either an input or output object that generates two output values or processes two input values. That interface and an additional size constraint let the students focus on the object and its sensing or acting mechanism.