I have just completed 2 Felini boards with minor hardware modifications. By adding the TPS63811 power IC, Felini can provide customizable output voltage at the power pin within the range of 2.2-5.2V. The new design also incorporates a logic level shifting IC, in conjunction with the TPS63811, enabling Felini to easily communicate with different logic levels such as 2.8, 3.3, 4.2, and 5VDC without the need for shift level circuits.