The subject of my thesis concerns the hardware development of new functionalities inside a medical smartwatch, named PulsECG. PulsECG is an existing device that has been designed by Neuronica department of Politecnico di Torino, that measures ECG and blood oxygenation level. The goal was to use the knowledge acquired during the Electronic Engineering degree in order to develop a useful, practical and comfortable watch dedicated to the health of the user. In particular, the main objective was to add new functionalities in the watch without affecting size and wearability. PulsECG watch has kept the pre-existing functionalities: the measurement of the level of blood oxygenation and the ability to measure the main parameters of heart activity through an ECG graph on the smartphone application.