Marlin 3D Printer Firmware Copyright (c) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
Based on Sprinter and grbl. Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/. Rev C 2 JUN 2017
Converted to Arduino pin numbering There are two Arduino IDE extensions that are compatible with this board and with the mainstream Marlin software. All have been used with Arduino 1.6.12
Teensyduino - http://www.pjrc.com/teensy/teensyduino.html Select Teensy++ 2.0 in Arduino IDE from the 'Tools > Board' menu
Installation instructions are at the above URL. Don't bother loading the libraries - they are not used with the Marlin software.
Printrboard - https://github.com/scwimbush/Printrboard-HID-Arduino-IDE-Support This is basically Teensyduino but with a bootloader that can handle image sizes larger than 64K.
Installation:
- Go to the above URL, click on the "Clone or Download" button and then click on "Download ZIP" button.
- Unzip the file, find the "printrboard" directory and then copy it to the hardware directory in Arduino. The Arduino hardware directory will probably be located in a path similar to this: C:\Program Files (x86)\Arduino\hardware.
- Restart Arduino.
- Select "Printrboard" from the 'Tools > Board' menu.
Teensyduino is the most popular option. Printrboard is used if your board doesn't have the Teensyduino bootloader on it. To burn the bootloader that comes with Printrboard:
- Connect your programmer to the board.
- In the Arduino IDE select "Printrboard" and then select the programmer.
- In the Arduino IDE click on "burn bootloader". Don't worry about the "verify failed at 1F000" error message.
- The programmer is no longer needed. Remove it. SILKSCREEN ERROR
The silkscreen for the endstops do NOT match the schematic. The silkscreen SHOULD read (from left to right) X-STOP, Y-STOP, Z-STOP & E-STOP. The silkscreen actually reads E-STOP, X-STOP, Y-STOP & Z-STOP.
The pin assignments in this file match the silkscreen.
1.8.16 
