Pronterface refuses to connect to my printer. The monitor just says "connecting..." and stays that way. Both the board and pronterface are using COM 8. Baudrate is 250000 on both. I have tried changing the baudrate. I have tried a different USB cable and port. I have made sure that Arduino and Pronterface are not running at the same time. The board can connect the the Arduino IDE without a problem, and uploads the code just fine. I have tried uploading some test code, which works perfectly, moving all motors and heating up the hotend. I am assuming that it is a firmware problem, but I don't know where to begin. I have tried two different versions of Marlin with no success, as well as resetting the board. Nothing has shown up on the serial monitor.

Whenever the board is unplugged, I get this:

[ERROR] Can't read from printer (disconnected?) (SerialException): call to ClearCommError failed
[ERROR] Can't write to printer (disconnected?) (SerialException): WriteFile failed (WindowsError(22, 'The device does not recognize the command.'))

I never tried 250000 BAUD. Maybe it'll work with 115200B?

... do you have the firmware source? - in the "configuration.h" ist the set baudrate - with my firmwares I'm using mostly 250000 ... but sometimes, in "harsch EMI ebvironment", the 115200 or even slower, until the connection stays stable over times.

With the ArduinoDue it's different too, if you use the "native" or "programming" port ...

---

Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

I have tried using 115200 BAUD. Both the firmware and Pronterface are set to the same thing. Using an Arduino Mega.

Edited 1 time(s). Last edit at 06/14/2018 12:00PM by vegetable.

post your config pls

Here is my config:
https://pastebin.com/CX7BaBEt

Only thing i can see is, you say you have a ramps1.4 board yet you have the motherbord defined as a ultimaker,

Quote

// The following define selects which electronics board you have.
// Please choose the name from boards.h that matches your setup

#ifndef MOTHERBOARD
#define MOTHERBOARD BOARD_ULTIMAKER
#endif

try changing this to

Quote

#ifndef MOTHERBOARD
#define MOTHERBOARD BOARD_RAMPS_14_EFB
#endif

Whoops. I installed an older version of Marlin to see if it would work, and I guess I forgot to change that. I was doing the same thing even with it was set to the correct board, but I can try again.

Edit: just changed it to this: #define MOTHERBOARD BOARD_RAMPS_13_EFB

Still no luck.

Edited 1 time(s). Last edit at 06/13/2018 10:19PM by vegetable.

Quote
vegetable
I have tried using 115200 BAUD. Both the firmware and Pronterface are set to the same thing. Using an Arduino Uno.

I'm just wild guessing, but AFAIK the Uno R3 has a different USB2serial chip than the usual Mega2560.
I'm also surprised you could flash Marlin on an UNO?
Is there a difference between ramps1.3 and 1.4? ( except 1.4 is more SMD oriented )

Edited 2 time(s). Last edit at 06/14/2018 12:25AM by o_lampe.

"Is there a difference between ramps1.3 and 1.4?"

very minor, most will never notice.

#ifdef IS_RAMPS_13
  #define SERVO0_PIN        7 // RAMPS_13 // Will conflict with BTN_EN2 on LCD_I2C_VIKI
#else
  #define SERVO0_PIN       11
#endif

Ie Servo 0 is on pin 7 on 1.3 vs 11 on 1.4

Quote
o_lampe
I'm also surprised you could flash Marlin on an UNO?

Terribly sorry, I've been doing so much stuff with unos lately that I forgot I was wasn't using one.

Actually using a MEGA. Cheap clone ordered from amazon, this is the second arduino/RAMPS that I have tried.

Servo pin is set to 11.

Edited 2 time(s). Last edit at 06/14/2018 12:04PM by vegetable.

Check in windows device manager/ports that the arduino is actually on com port 8

It is.