Mendel Electronic Wiring
This page describes how to wire up RepRap Version II "Mendel".
This is the overall Mendel wiring diagram; click the image for a full-resolution version. The wiring diagram is stored as an [Eagle] schematic in the [RepRap subversion repository here]. Check that link for the latest revisions and corrections. In the diagram above multi-way connections are shown as thick lines with a number next to them. The number is the number of wires in the connection. Single wires are thin and unnumbered.
One Mendel will need:
- A RepRap Motherboard,
- A Mendel USB and power connector,
- 3 RepRap Stepper drivers,
- 3 RepRap Opto Endstops, and
- As many RepRap extruder controllers as you have extruders.
Follow those links for details on the individual printed circuit boards.
The power wiring is not shown on the diagram for clarity, but it is very simple. The 12 volts from the Mendel USB and power connector is connected in parallel to the three stepper driver boards and to all the extruder controller boards. The Motherboard does not need to be connected to Mendel's internal power connectors. It is powered by the USB connection from the computer.
The extruders are connected in parallel to the RS485 and to the SDA and SCL ports on the Motherboard. The system only has four connectors for these on the Motherboard, but you can chain these together up to any reasonable number (in theory it should be possible to drive 64 extruders at once...).