Solved Commands to calibrate the bed temperature

I just bought a Robo 3D R1 + V2 printer used and with a bed modification from partsbuilt (Heated Glass Build Plate for R1+) and the temperature seems to be off by quite a bit.

The program says its 68c but I'm getting 25c with my infrared thermal and voltmeter temp sensor a 43c difference, my room is at 23.9c. I know this is bad and I don't want to have wrong information appearing on screen I currently have a replacement bed on it's way but I'm not sure this will fix the problem.

I have gone to help(dot)robo3d(dot)com with this article 115002627252-How-to-PID-tune-your-printer-temperature, I followed all the instructions twice and there is the same variance.

What are the commands in the terminal to change this offset, there must be a way to calibrate this more accurately.

Any help would be appreciated as I have to heat the bed and check it with the thermometer to get the bed at the correct temperature.

Thank you in advance

 

I see the temp in matter control

After more tinkering last night I found that the mainboard (RAMPs board) is the problem, I was just too exhausted to post. I disconnected the ribbon cable and the program still shows a temperature. So the sensor must have gotten fried when I misaligned the cable for a moment and the power must have gone through it. I'll need to get a new RAMPs board to fix this issue. Unless you know of another way to fix it.

Thank you for the reply Mark

I will be making a new ribbon cable that won't allow for misalignment when connecting. Like a 6 pin video card molex.

 

Good to know. Thank you Tomlinson

I get my new parts on Monday so by the weekend I should have it all up and running.

 

Well bad news... the problem isn't with the ramps board.

I changed the ramps board and the hot plate so the problem must reside with the arduino board. This really sucks, I wish there was a fully available schematic for both the ramps and arduino boards. I might have been able to see that the ramps board was a pass through for the sensor and connects directly to the arduino board.

Now I got to buy an arduino board and learn how to programs the marlin.

@Tomlinson do you have a post or site off hand that has those steps?

 

Thank you for the info. Well the board is different that is listed on the site, this is the one I bought and was previously installed;
partsbuilt ramps board r1 robo

I was looking for this specific one and that's the one I couldn't find. So if I extrapolate my board onto this schematic I can see it does show the wiring basically going directly to the arduino after the input.

Here is the trace I made, in yellow, for the output to the arduino board


This gives us C7 and R7 for T0 which extrapolates directly to my ramps board that I own.
I've circled the pins that they go to on the arduino board and to the IC



So it can certainly be ramps or the arduino board since there is a capacitor and a resistor for the input of sensor lead on the ramps board. And since I do not have damage on my old ramps board and the new ramps still shows the false temp the damage must be on the IC of the arduino board



I'll see if the arduino IC or board has any damage after I get the new one in.

I've never programmed or loaded firmware on a arduino, what do I need to prepare to load the Marlin firmware? I see many posts on this site that mention specific versions that they like because of issues or upgrades, one I saw was for automatic calibration I'd like to have that in the version I'd put onto the new board. So which version would you suggest?

 

Gotcha, thank you.

Why don't you like auto leveling?

 

So it was for sure the Arduino board not the RAMPS or the hot plate. The new arduino board shows the temp accurately. Good to know for future issues.

@mark tomlinson, thank you for all your help! You've been a real help and kind with your time.

 

The fun part is that the old arduino board has no visible signs of damage from this issue. It must be contained within the IC processor.

 

I did trace the ports on the site schematics that you gave me from the arduino site and I remember A13-15 goes directly to the CPU IC. There are no buffers on the RAMPS side either, I wish they did

I still appreciate your help and want to thank you again good sir.