M912 to calibrate 3HC expansion MCU temp
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M912 only seems to apply to the main MCU temp.
Looks like one of my 4 3HC boards needs an adjustment -- checking the board with ir sensor, and thermocouple -- it's no different than the rest, but it reports 34c while the rest report 25c -- real temp is 23c, so 25 is close enough, 34 is pretty far out there. -
Yes it looks like it currently only supports the mainboard. I'll move this to the wishlist category.
Do any of the chips on the 3HC seem abnormally hot? How did you verify the real temp is 23c?
With regular cooling, do the temps raise high enough to matter?
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Moved from Firmware installation by
Phaedrux
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@phaedrux on startup after being off for multiple hours all other boards report 22c, main, and 3 3hc boards, the 4th says 31c, I checked board with ir sensor and and flir style cam sensor, all look the same. Nothing is legit 31c. So looks like the 3hc board mcu temp sensor is off.
I ran the boards for a couple hours, with cooling, all other boards top out at 25-26c, the other one says 34-35. But inothing on it anywhere near that. -
@Phaedrux got a new thermal camera today, and examined the basement of machine with the printer in a homed state and all steppers powered.
Thermal camera shows 23c on the hottest components. M122 B4 reports 34c on one board -- is it worth an RMA, or this is just a misconfigured temp reader? That 3hc board only handles 2 nema 23 2.4a steppers and corresponding endstops. There is another 3hc board that has the other pair of nema 23 steppers end stops -- same exact setup, part of the quad Z gantry setup, and that board reports 25c in M122 B3. Thermal imaging shows both boards having the same hot spots and same temperature distribution. -
I don't think there's anything to worry about. If and when MCU temp probe calibration becomes available for expansions it would be an easy fix.
