برد کنترلر پرینتر سه بعدی 32 بیتی Ramps-FD سازگار با آردوینو Due
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Arduino Dueis the new Arduino board that is using an ARM Cortex M3 CPU.
Atmel SAM3X8E chip used on the Due operates at 3.3V and is not
compatible with 5V. Therefore the RAMPS shield will not work with Due,
and worse applying 5V to the Due's inputs will likely damage the chip.
Therefore there are several possibilities: create a new RAMPS variant which is compatible with the Due. Possibly could also be made backwards compatible with Mega. create a RAMPS Interface Board (RIB) to sit between Due and RAMPS to perform level-shifting, and any other needed functions.
Why should i use Ramps-FD instead of Ramps1.4? Campare Ramps-FD with Ramps1.4,the Improvements of Ramps-FD are below The RAMPS-FD has other hardware protection, through the jumper cap control motor drive IC The RAMPS-FD Much more than Ramps1.4 2-way PWM The RAMPS-FD has Larger driving power than Ramps1.4 The RAMPS-FD 'POWER has two choices：12v and 24v
why should i selectArduino Due instead of Arduino Mega? due has lower power ，computing faster and flash，sram bigger than mega2560 CPU operates at 3.3V High-current IO pins are capable of 15 mA source, 9 mA sink Low-current IO pins capable of 3 mA source, 6 mA sink CPU package has an absolute max of 130mA The
Due has 1 dedicated SPI port, and 4 multipurpose USART/SPI ports. The
SPI port is only routed to the 6 pin header used for ICSP on Mega, but
this is not used for ICSP on Due. The Due does not have any EEPROM
Hardware issues: MOSFETs need to be compatible with threshold voltage of 3.3V or better have a gate driver which allows any MOSFET to be used Expansion pins need to be level-translated, but this depends on how they are used Add ons: SD card, thermocouple drivers, LCD boards Is heat dissipation of Due ok with RAMPS shield over it? Some opto-endstops need 5V power, and return 5V on signal (AUX-3) The SPI pins on the Mega (mapped to pins D50-52) are not SPI pins on Due
Hardware features known to be compatible: The
Allegro stepper drivers will run with VDD = 3.3V and the logic signals
compatible with 3.3V. This should apply to all the Pololu style drivers. Servos "should" be able to operate with +5V power and a PWM signal of 3.3V Thermistors will operate at 3.3V but the Analog Ref is also 3.3V, so no changes should be necessary Mechanical endstops should be OK, if they do not use external pullup to 5
Add-on compatibility: Sdramps
(AUX-3 SPI connector) This board has a 5->3.3 voltage regulator and a
level translator. I think it will work and be compatible if powered
from 5V, but will not work if powered at 3.3V, because the input to the
regulator is too low.
Possible improvements: Move connectors near to board edge Allow for latching or screw terminals?
Firmware changes: Firmware needs to be compiled with ARM compiler (gcc) Arduino libraries may be compatible Any references to AVR CPU peripherals, AVR include files or AVR compiler features need to be ported There is no EEPROM on the SAM3X.