This is the first draft of a 7 x Stepper Motor Hat. It target uni- or bi-polar steppers up to 500mA per phase like the 28BYJ-48. It also have 7 x end-point connectors. Using the ULN2003 as driver it also provide generic PWM and digital ports that can be used as such. The PSU is external and can be up to 50V. The MCU is powered separately from RPI.