This project has been abandoned!
This is the schematic for the all new SMuFF Backbone board, which combines several components, such as Buck-Converter, Shared-Stepper Relay, I2C Servo controller and optionally a SMuFF-WI running on a Wemos D1 mini.
Here are the two versions of the TWI/I2C display board. On the left for the SKR mini V1.1, on the right for the SKR mini E3(-DIP) controllers. There are two versions because the EXP1 connector on these controller boards have different signals assigned to it.
SKR mini V1.1
SKR mini E3 V1.2 / SKR mini E3-DIP V1.1
This is the controller board for the "Smart" version of the SFB (Revision 2). If you're just building the "standard" version (non "Smart"), you don't need this board. This PCB can be ordered directly from PCBWay.
This is the schematic for the shrunken relay board PCB as mentioned here. This PCB can be ordered directly from PCBWay.
This is the schematic for the new version of the SMuFF-Ifc. This PCB also can be ordered directly from PCBWay.
Please be aware that this is a prototype only board, which was used as a proof of concept. There's no existing PCB for this prototype yet.