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Tube phonation, or straw phonation, is a frequently used vocal training technique to improve the efficiency of the vocal mechanism by repeatedly producing a speech sound into a tube or straw. Use of the straw results in a semi-occluded vocal tract in order to maximize the interaction between the vocal fold vibration and the vocal tract. This method requires a voice trainer or therapist to raise the trainee or patient’s awareness of the vibrations around his or her mouth, guiding him/her to maximize the vibrations, which results in efficient phonation. A major problem with this process is that the trainer cannot monitor the trainee/patient’s vibratory state in a quantitative manner. This study proposes the use of Smart Tube, a straw with an attached acceleration sensor and LED strip that can measure vibrations and provide corresponding feedback through LED lights in real-time. The biofeedback system was implemented using a microcontroller board, Arduino Uno, to minimize cost. Possible system function enhancements include Bluetooth compatibility with personal computers and/or smartphones. Smart Tube can facilitate improved phonation for trainees/patients by providing quantitative visual feedback.