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PICA 24V parts list; Re-ARM compatibility: bridge Vpsu/12V to Vin? #1

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rumlyne opened this Issue Mar 13, 2017 · 1 comment

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rumlyne commented Mar 13, 2017

Dear mjrice,

searching for a better alternative than a 24V RAMPS for my Re-ARM board I came across your PICA and I have a few questions:
Are you selling a set of the components needed to make it 24V compatible? If not could you provide a parts list?
Also the PICA provides the Arduino Mega with 9V via the Vin pin. The Re-ARM needs at least 10V and can tolerate up to 30V. Is there a way to bridge that pin to Vpsu/24V or 12V on the Pico? What other electronic parts does the PICOs 9V regulator supply with current? If there are no others it should be easy to bridge the pads reserved for that regulator.

Best regards,
rumlyne

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rumlyne Apr 18, 2017

He replied on a different platform:

I sell the boards with or without the 24V input. When it is installed, it
is a buck converter that generates an on-board 12V from the 24V. The 12V
is used to power the two lower power mosfet switches as well as the
on-board 5V regulator and the arduino itself through a zener diode. The
three higher power mosfet switches and the stepper motor drivers are driven
from the input supply directly. You can also modify a 12V unit to be 24V
compatible - the design is all open source and the schematic is here:
https://github.com/mjrice/PICA/blob/master/pica_schematic.pdf

And lastly to answer your question, yes, you could either short out or
reverse the diode D13 which would increase the voltage on the arduino's VIN
pin from 9V to about 11.3V.

I don't know much about the Re-arm board but otherwise it looks like it
should work like you expect.

rumlyne commented Apr 18, 2017

He replied on a different platform:

I sell the boards with or without the 24V input. When it is installed, it
is a buck converter that generates an on-board 12V from the 24V. The 12V
is used to power the two lower power mosfet switches as well as the
on-board 5V regulator and the arduino itself through a zener diode. The
three higher power mosfet switches and the stepper motor drivers are driven
from the input supply directly. You can also modify a 12V unit to be 24V
compatible - the design is all open source and the schematic is here:
https://github.com/mjrice/PICA/blob/master/pica_schematic.pdf

And lastly to answer your question, yes, you could either short out or
reverse the diode D13 which would increase the voltage on the arduino's VIN
pin from 9V to about 11.3V.

I don't know much about the Re-arm board but otherwise it looks like it
should work like you expect.

@rumlyne rumlyne closed this Apr 18, 2017

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