RAMPS 1.4.4

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Version specific info
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RAMPS 1.4.4

Release status: Prototype

RAMPS144.jpg
Description
RepRap Arduino Mega Pololu Shield Arduino MEGA based modular RepRap electronics.
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Summary

A RAMPS board for a single 24V supply. Can be used with TMC2130 drivers, and controlled by both 8-bit and 32-bit controllers.

Click any image for larger versions

How this board came into existence

While I were designing the RAMPS 1.7 shield, a friend said: Well, that is all good and dandy, but 10x10 cm is too big for my printer. I need a RAMPS shield that can do TMC2130 drivers (without wire jumpers), be used with a single 24V power supply, and still be only the size of a standard RAMPS board, or it will not fit nicely on my printer.

So we came up with the following design framework:

  • only a RAMPS 1.4 foot print (+/- a few millimeters if necessary)
  • two additional fan ports. As this particular printer also needs a hot-end cooler fan (you know, for that extra fan on the E3D V6 hot-end that cools the heat breaker section of the hot-end), and a controller-board cooler-fan (because electronics that are trapped inside a very small controller enclosure tends to get too hot, with out at least some forced air movement.
  • all TMC2130 SPI wires on the main PCB (preferably jumper selectable, so more ordinary stepper drivers can be used for Z-axes and the two extruder steppers).
  • one 24V power supply only, to power everything.
  • an integrated 12V DC-DC converter. To supply power to the Mega, and possibly 12V to the fans.
  • works with the RRD LCD 4-line text display.
  • preferably no polyfuses for the main power, but with everything still fused on the main board.
  • integrated 100nF capacitors on the end-stops.
  • SMD mosfets
  • ability to be controlled by 5V and 3.3V MPU controllers alike. Meaning:
    • all mosfets will have a 5V buffer chip, in order to translate 3V MPU (main controller board) signals to 5V mosfet gate signals.
    • having 5V available on the board (and the AUX-3 port), even if the MPU (main controller board) is mainly a 3V board.


We have since added:

  • Hardware SPI port, (in the middle of the Arduino board) and not only from pins 50-52.
  • a 12V Z-probe port-option.
  • 4K7 ohm series-resistors on end-stops, so 3V MPUs can (hopefully) be 5V tolerant.
  • 5V, 12V and 24V pins

Files

Once we have a working prototype, we will share the design files.

Schematics

144-schematics-01.jpg

PDF version here