Next is the verified circuit diagram of the L9110 dual-motor driver module that I bought from RhydoLabz ... Even though it’s easy to use a microcontroller like Arduino to test the module, I simply ...

The Arduino has been used for many purposes, and “shields” are available to make many common tasks easier. However, [Nick] wanted a stackable motor driver shield, so he build one himself!.

Their counter-terminals are 0V from the MCU power domain. The motor driver enable output (ENA on diagram) does not get its own 5V or 0V return output (it is almost as though the case was bought-in, ...