Bootloader for CTC i3 GT2560 Rev A Clone
Description
I have a CTC i3 DIY 3D Printer I bought from eBay. It runs off a clone of the Geeetech 2560 (GT2560) Revision A board. Sadly they neglected to put a bootloader onto the board, and as such I was unable to upload any new firmware to it. I looked around online and saw people successfully uploading firmware to this clone board by changing the baudrate in the arduino IDE's boards.txt file. However those boards must already have had a bootloader installed on them. It is true that this board uses a different baudrate, but without the bootloader it makes no difference. I guess it's just a flip of the coin whether any given GT2560A clone has a bootloader installed on it at the factory or not. Well mine definitely didn't from the connection errors I was getting when trying to upload firmware. So these are the steps I went through to get a bootloader onto it. **WARNING - This process will erase the firmware installed on your board, so be ready to flash it again with Marlin after installing the bootloader. My board is the GT2560 Revision A - I have no idea if this would work on the A+ or the original GT2560. You do all this at your own risk regardless of what board you are using.** Before you start this process you should ensure you have Marlin configured, compiled and ready to upload. I have made an example Marlin configuration for this printer and tutorial showing how to do this here: https://www.thingiverse.com/thing:4475743 **Ensure your 3D printer is unplugged! The board will get all the power it needs from the Arduino. If you have the printer plugged in you could damage your board, the Arduino and even your computer.** ### You will need: - An Arduino Mega 2560 (or Uno). I used a clone mega 2560 R3 from Amazon. - A capacitor between 10 and 100 uF. I used a 47uF one out of an old power supply. - 6 to 8 Male to Female Dupont wires, 8 if you need 2 of them to connect to the capacitor to the Arduino. You don't need these 2 if your capacitor's legs are long enough. - A USB cable to connect to the Arduino to your computer - Your GT256A Rev A board - Arduino IDE installed - The ArduinoISP.ino file attached to this Thing
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