M105 Temperature Report Format
The M105 temperature report from the MK4 looks like this:
Recv: T:26.50/0.00 B:23.93/0.00 X:25.11/36.00 A:38.55/0.00 @:0 B@:0 HBR@:0
T and B are standard, Toolhead and Bed respectively. And X appears to be the heatbreak. What is A?
RE: M105 Temperature Report Format
According to the source, A is the board temperature (from "ambient" probably).
RE: M105 Temperature Report Format
Thank you for finding that. I had guessed it might be the board or cpu, but did not find the code -- and also didn't see much change when giving the board some load (like uploading a large print and rendering it for the display). Appreciate the help!
RE: M105 Temperature Report Format
No problem. I suppose simple upload is handled fine, I would probably try rendering multiple previews (opening the web-ui and loading all files thumbnails, but they may be cached, and the network is slow enough that it might be idling anyway).
RE: M105 Temperature Report Format
I couldn't get the "A:" temp to move much with any kind of processing loads.
I could not find a schematic for the MK4 buddy board but did find one for the mini. It has a board-mounted thermistor (TH1, NTCG104LH104JTDS) located adjacent to the heatbed connector. I'm guessing they put it there to monitor the heat produced by the high-current load connection going to the heatbed.
And sure enough, when I powered up the bed heater, the "A:" temp begins rising (slowly but steadily). After disabling the bed heater, the "A:" temp stabilized and then began falling.
So at this point (or until I get a mk4 board schematic) I am going to guess the "A:" is reporting board temperature near the heated bed connector.
RE: M105 Temperature Report Format
Makes sense. It is definitely not "cpu" temperature, so even if it reacts to load, it only averages over longer times anyway.