Release status: Working
After using RAMPS for a long time I am still quite fond of it. There are some aspects of the board however that make it unusable for future electronics, which should be reliable and cheap. Also the wiring can we a bit fiddly. I have combined the Arduino MEGA and RAMPS boards into a single board solution. Only the stepper drivers are still modules for easy replacement.
Megatronics is based on many famous open-source products including: Arduino Mega 2560, RAMPS, SD Ramps. Therefor this product is an already proven design. It combines all major features of these board into a single board solution for more reliable 3D-printing.
Megatronics has a powerful Atmega2560 processor with 256 kB memory, running at 16Mhz. The board can be connected to a PC using a normal USB cable. It will register as FTDI FT232R device. The board is compatible with the Arduino Mega 2560 and will therefor be easily programmed from the Arduino IDE.
Powerful Atmega2560 processor with 256 kB memory, running at 16Mhz
On board support for connecting a thermo couple
Autonomous printing from Micro SD card on board
The board has 4 MOSFETs (4x 150A) to support many needs.
Compatible with RAMPS, 5 slots for stepper drivers. Modularized to make replacement easy for damaged drivers.
The board's functions can be easily extended with LCD, keypad etc. See the connectors section for more information
- Auto reset can be disabled by removing a jumper
- The board can be powered from 12V1 (12V MAX), by setting a jumper
- The LCD contrast can be adjusted with a trimpot
- 12V1 has a diode to protect against reverse polarization
- The 5V line is protected by a 500mA resettable fuse
- A piezo is included to allow the printer to give feedback with sound
- Each stepper driver slot has a breakout to connect external stepper drivers to the board.
- Three layer high quality PCB board
|JP_5VUSB||When jumpered powers the board from USB (5V)|
|RESET-EN||When jumpered enables reset (DTR). Without it the board cannot be programmed using the IDE. It's recommended to remove the jumper for production machines.|
|X3||Breakout for FT232 pins|
|ICSP||2x3 header to program the Atmega chip directly|
|PS-ON||Power on output. This can be connected to the power supply to enable 12V from the board.|
|AUX3||Break out for digital pins 46,47,48,49|
|AUX4||Break out for digital pins 43,44|
|I2C||Break out to connect extra peripherals using I2C|
|Thermocouple||Terminal block to connect a thermocouple|
|Keypad||2x5 header to connect to a keypad|
|End Stops||6x3 header to connect end stops|
|LCD||2x6 header to connect a LCD screen. Compatible with most LCD screens
|Temperature||1x6 header to connect up to three thermistors|
|A-OUT||Analog output (compatible with RAMPS)|
|SERIAL||Serial output (compatible with RAMPS)|
|DigitalIO||Break out for digital pins 2,3,4,5,6,11,35,39|
|JP_5V||2x3 header for 5V output|
|JP_12V||2x3 header for 12V output (+12V1 line)|
|Extruder||Connector for extruder (MOSFET Q5)|
|12V1||+12V1 line input (11A Max) when SRC12v is NOT jumpered up to 24V is accepted|
|12V2||+12V2 line input for heated BED (11A Max)|
|X-MOT,Y-MOT,Z-MOT,E0-MOT,E1-MOT||Connectors for bipolar stepper drivers|
|JP2-6||Stepper mode selector for stepper drivers|
|SRC12v||Power the board from 12V1. WARNING: MAX 12V is accepted|
Where to get it
Currently the following firmwares support megatronics without modifications:
You can use Arduino IDE to upload firmware to the Megatronics board. Under Linux selct as board 'Arduino Mega 2560 or Mega ADK'. Under other operating systems the USB will not be reset correctly and you will need to adjust the boards.txt. This file is located in <Arduino directory>/hardware/arduino/boards.txt. Add the following text to the file:
megatronics.name=Megatronics megatronics.upload.protocol=wiring megatronics.upload.maximum_size=258048 megatronics.upload.speed=115200 megatronics.bootloader.low_fuses=0xFF megatronics.bootloader.high_fuses=0xDA megatronics.bootloader.extended_fuses=0xF5 megatronics.bootloader.path=stk500v2 megatronics.bootloader.file=stk500boot_v2_mega2560.hex megatronics.bootloader.unlock_bits=0x3F megatronics.bootloader.lock_bits=0x0F megatronics.build.mcu=atmega2560 megatronics.build.f_cpu=16000000L megatronics.build.core=arduino megatronics.build.variant=mega
Restart Arduino IDE and select Megatronics as board. You should be able to upload correctly now.