Hi! I am trying to power my project using the VIN pin with a battery that is 4.4v (within the 3.6-5.5 volt pin specifications). The problem is that when I wire any digital or PWM signal to LOW the voltage does not drop to 0.0v but instead is about 0.3v. This is a problem with the projects I need LOW to be 0.0v for the motor controller. Using the USB cable when writing LOW to a pin produces 0.0v. Any ideas why or how to fix it? Thank you!