Is v3.2 firmware running hotter?
achrn last edited by
I've upgraded my MB6HC to v3.2 firmware.
Is it possible that this firmware makes the MCU run hotter when idle? Mine seems to be doing so, and I don't think there are any other changes taht could affect it (I haven't changed airflows, or room temperature or anything).
The reason it came to my attention is that I have a small centrifugal fan that blows under the main board if the MCU temperature exceeds a limit:
M308 S9 P"mcu-temp" Y"mcu-temp" A"mcu" M106 P3 S1 L0.40 B0.5 H9 T40:50 C"underb"
Previously, this didn't come on much at all, even when printing - I don't have very big steppers so the drivers are nowhere near their limit, the enclosure is reasonably ventilated. However, recently I noticed that the fan is running pretty much continuously, even when the printer has been idle for 24 hours. (Yes I should have switched it off before then.)
I just switched it on after it had been powered off for a couple of days and the MCU temperature is already at 38C from a starting point of 20C, after doing nothing for ten minutes (actually I haven't even applied teh 24V - it's just got the 5V supplied). It's still climbing, but slowly.
However, I never recorded the rate of MCU heating before, so I don't actually have a good data set for comparison. Am I imagining it?
Firmware 3.2 makes better use of cache memory to execute more instructions per second. So it's possible that the processor generates a little more heat.