Welcome to the SeeMeCNC Community

Just finished the build of my Rostock Max but after connecting to my printer I am not getting any temperature feedback inside matter control.

The LCD screen is displaying the correct temp (approx 20C) but the temperature display inside matter control shows 0C for both the nozzle and the bed. I am unable to control the temperature either, if a temp is commanded it just stays at 0 degrees in matter control and the temp on the LCD screen is unchanged.

As the LCD is functioning fine, this appeared to be a connection issue between my PC and the printer but I can move the axes... (also I have checked Baud rate and it is set to 25000 which I am told is correct).

The strangest thing is that when I was rechecking all the wiring and had the Rambo board out of the base and was poking around, all of a sudden the temperature was showing up and I could control it. However, after a few minutes it just went back to 0 and has stayed there ever since.

Hardware/wiring issue? Or connection issue? I think my wiring into the power supply plug is a bit sketchy but I was measuring a full 12.2V going in.

Any help would be awesome

Help will be here soon - Xenocrates where are you?

I was still in the other thread on this. I got behind since I was throwing trees in a dumpster.

I believe it may be a connection/bandwidth issue.

Have you tried heating it on the LCD (I realize this won't help PID tuning at all, but humor me)?

Beyond that, shoot me a copy of your firmware as you uploaded it to the printer. I think I have a zombie* Rambo I can test with, and in any case I may be able to rip out the accelormeter code fairly cleaning.

Have you tried other computers, or changing the Baud rate to a different (Matched on each end) value?


*It died, but we believe it was just a bum reset switch, which has now been removed. I'll test it eventually.

Hi Xenocrates,

Thanks again for the help but I'm still struggling here. Many issues...

I tried to manipulate temperatures from LCD screen as you asked but was unable to do so.

It appears that the LCD selection knob is also not functioning correctly:
- a single button push doesn't bring up menu - you have to hold in for approx 3 seconds to bring up menu
- then when menu is up you cannot navigate it - rotating/clicking the knob does nothing then it just return to the home screen
- not really relevant but also interesting to note that the cable to the LCD screen had to be plugged in to the Rambo end upside down compared to the manual to put the coloured side of the ribbon on the correct side (and to actually get the screen working).
- also the reset button does not work - regardless of how long you hold it...

Despite this I moved on.

Next I tried to re-upload the firmware and found a different connection issue
- first tried clearing EEPROM and a connection error was thrown (something about a board being disconnected, didn't record message as I thought I'd just try again)
- then tried to re-upload Repetier firmware and saw the same error message
- however then tried each one again and they both worked fine... seemed like an intermittent error (suspicious considering previous symptoms)

Finally I tried to change the baud rate to 15200 on both printer and PC however was unable to reset the Baudrate from the LCD panel due to the issues outlined above.

I then tried to change this in the firmware in configuration.h but I think the EEPROM was overwriting the config file to 250000. I tried changing EEPROM mode to 2 (as per the following instructions http://forum.seemecnc.com/viewtopic.php?t=2712)
however this did not work, the printer showed an 'invalid response' when 152000 was chosen in mattercontrol (which I would expect with mismatched baudrates) however when this was changed to 250000 then the printer connected but still no temp was being displayed

Sorry for the patchy info - but that's all the troubleshooting I can muster today so I will have to leave it here. Also, I haven't had a chance to try another computer but it appears there are other issues here...

I have attached the firmware that's on the printer right now.

Try line 615,
#define FEATURE_Z_PROBE 1

I think if you change that to a 0, or comment out it and all the other probe definitions, that should help.