Hi,

If you switch the toolbar from Debug to Release it should work okay.

The error is because the 3d firmware removes the ability to use Arduino Serial which the debugger uses in its default configuration.

You can probably use the alternative SoftwareSerial option on any one or two digital pins.

More info here http://www.visualmicro.com/page/User-Guide.aspx?doc=Debugging-With-Different-Por...

You will need an ftdi adapter or usb cable such as this one. Use the 3.3v version of the cable and it works okay also more useful with other boards.

One pin for trace only debug and two pins for full break/update vars.

Alternatively you can buy an AVR hardware debugger such as ATMEL ICE and then use Visual Micro in Atmel Studio to debug the Arduino.

Great. Interested to hear how you get on.

The SoftwareSerial option is a standard arduino library that Visual Micro uses.

So you can try it out to make sure it works by using the SoftwareSerial library and a basic example to send serial using it.

You can use loop back to the arduino to test by connecting the Rx\Tx pins you assign to softwareSerial to the tx\Rx pins of a spare hardware Serial port on the mega such as Serial2.

The software serial reference is here 
https://www.arduino.cc/en/Reference/SoftwareSerial

Then you should be able to read and write between the two ports using normal Serial to the pc for visible status messages

In essence the arduino just sends and receives data from itself but proves that your 3DPrinter isn't hogging too much.

......

Note

If you do use the debugger then make sure you switch the ThrottleEnabled in the Project Properties to False so that the Arduino runs at full speed. That's important for time critical applications and means you should put debug trace messages in fast running code otherwise it will produce more messages than your pc can handle

Thanks so much for your help. I can tell I'm in water over my head. Can you tell me which two sets of pins I should use on the RAMBo 1.3 Mother Board?

View Mother Board schematics

The site with that file link is;
https://ultimachine.com/products/rambo-1-3

OK, Thanks