This article presents a case study of the integration of the Internet of Things (IoT) in high-school biology project-based learning. The study's main goal was to conduct an in-depth, qualitative examination of the students' experiences and the development of their skills over the course of this project. The following research questions were formulated: (1) What were the significant learning experiences for the high-school biology students participating in the IoT-based project? (2) How did these experiences shape students' interpersonal, intrapersonal, and cognitive skills? The research approach applied was that of an instrumental case study with multiple data collection sources (in-depth interviews, observations, one-on-one discussions with the students). The data were analyzed by applying an embedded analysis focused on students' experiences and skills. The findings present students' cognitive, social, and emotional experiences and how these experiences shaped their corresponding cognitive, interpersonal, and intrapersonal skills. This research contributes to the theory and practice of project-based learning in high school.