Untitled (Arduino Project) is an interactive sound installation composed of an Arduino, a water-level sensor, and three distinct audio tracks. The simple yet deliberate gesture of pouring or draining water from a container directly influences the audio emitted through the sound system. Each interaction with the water sensor submerged in the container triggers immediate auditory responses, making the invisible properties of water—its volume, movement, and absence—audible. This minimalist artwork emphasizes the intimate connection between human action, technological feedback, and environmental consciousness, inviting reflection on our relationship with water as a precious and dynamic resource.