RAMPS for BeagleBone
Posted by cdsteinkuehler
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Re: RAMPS for BeagleBone January 04, 2015 09:55AM |
I don't have any 3D models of the CRAMPS board, but you might be able to get something useful out of KiCad. If you do a 3D view of the PCB, it looks like most of the big parts are there. I'm not sure if there's a 3D export option or not (I'm old school and do PCB design in 2 dimensions). 
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Re: RAMPS for BeagleBone January 07, 2015 12:15AM |
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cdsteinkuehler
I am working on a BeagleBone Cape version of the RAMPS design, called CRAMPS. I have a stub page created in the RepRap wiki, and KiCAD design files are on github. The design is based primarily on the RAMPS-FD, with changes where needed for the BeagleBone.
The schematic is mostly complete except for assigning some I/O on the BeagleBone P8/P9 pin headers, which I will do based on the PCB layout (in progress). I would appreciate any design review or comments on the schematic.
Features are pretty much identical to the RAMPS-FD, except for the AUX expansion connectors. There is an SPI interface available that will work with the RAMPS-EXT extruder expansion boards, and an I2C header. Both the I2C and SPI headers are 5V tolerant, to allow easier interfacing to existing 5V Arduino add-ons. I plan on using pass-through connectors to support additional expansion, so the large AUX4 connector has been removed, and the AUX2 analog connector has been modified to allow direct interfacing to a 4-wire resistive touch-screen.
Questions and comments welcome!
Charles,
Have you done anything on the software side for the touch screen, or only free-up the pins?
I am trying to figure out what kind of driver circuit I need.
My screen is like this:
-Dean
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Re: RAMPS for BeagleBone June 15, 2015 03:07PM |
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Yellobello
Other questiion:
When I would use Machinekit togehther with the BBB.. will it be realtime linux pulsing the stepper drivers straight with the CPU´s I/O or is it using the separate microcontrollers for this task?
A bit of both, actually. With Machinekit on the BBB, you get realtime linux doing the motion planning (servo thread typically executing at 1 KHz), but the actual step/dir pulses are generated by the PRUs (basically dual 200 MHz 32-bit on-chip microcontrollers), which is one of the reasons the BBB works _much_ better at motion control than other generic ARM Cortex-A boards.
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Re: RAMPS for BeagleBone June 15, 2015 04:14PM |
I made a buffer cape using a breadboard.
This cape will transfer signals between the BeagleBone, and the Stepper Drivers without sharing the same power supply.
Any power surges or sparks will not reach the delicate circuitry.
This cape will transfer signals between the BeagleBone, and the Stepper Drivers without sharing the same power supply.
Any power surges or sparks will not reach the delicate circuitry.
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