Yeah, I didnt connect the power source (none of my PMOD boards require additional power source, well my bad). Anyway, could there by a proper datasheet to this board ? Information regarding powering the board is provided only indirectly, in the schematic. Also, what is the voltage range I can measure ? The reference voltage doesnt seems to be directly stated anywhere, except schematic file, where there are 2 voltage regulators with unknown output voltage.