This article presents a hybrid demonstrative activity on precision agriculture, aimed at fostering digital green competences among engineering students. The activity lever-ages an IoT-based smart irrigation system-including ESP32 microcontrollers, environmental sensors, actuators, and cloud integration-as a hands-on learning context. Participants were introduced to the operational features of the system and engaged in configuring sensors, collecting real-time data, and visualizing environmental variables to optimize irrigation strategies. The educational experience was assessed using the SUTEEComp framework, which integrates digital and sustainability-oriented competences rooted in the European DigComp and GreenComp standards. This article analyzes how learners developed competences across areas such as data literacy, digital collaboration, creative problem-solving, and environmentally responsible action. The results suggest that demonstrative activities combining real-world IoT systems and structured competence assessment can effectively support the acquisition of digitally-enabled green skills in engineering education. Implications for course design and educational innovation in digital agriculture are discussed.