I'm having some annoying probs here. I've connected the 5940 to my arduino NANO according to the schematic, triple-checked everything, but the leds still won't light. The problem seems to be voltage on the outputs. My multimeter reads about 0.2 V when i'm pumping 4000 on the channels. When alternating (slow blinking) the result is the expected (0V, 0.2V, 0V, 0.2V etc). My usb supply voltage is 4.5V, could that have anything to do with it?