Topics created by krzaku

That's the exact formula from the linked wiki page: revs_per_second = (2 * supply_voltage)/(steps_per_rev * pi * inductance * current). It's the max revolutions per second of the motor itself, why would a target belt speed be in there?

Using a new SD card seems to have fixed it, I'm not 100% sure though because of the semi-random nature of this problem. Let's say it's resolved for now, if I encounter it again with the new card I'll report it. Thanks for the help in debugging this.

OK I think I understand what's going on and it's mostly (but not all) my fault. I've upgraded to 1.19 RC1 BTW.

What's throwing me is that clicking on any tool switches them all from active to standby, (but that's not really true). That is to say, the column next to "Tool" is "Heater" and it's that column which toggles from "Active" to "Standby" whenever I click on any tool. So under "Tools" I have Tool 0, Tool 1 Tool 2 etc and under "Heater", next to each tool I have Heater1. Heater 1, Heater 1 all the way down (because they all use the same heater). So it just looks like clicking on any tool, is toggling the state from Active to Standby for all tools because the heater next to the tool changes state. This is what was confusing me because I can have a heater showing active next to a tool that isn't actually active. When I look closely, the little underline for the tool is still present which is what actually denotes which tool is truly active. I have to ignore the word "active" and look for the little underline instead.

So now I understand and it was largely me being thick (nothing new there) but I'll put a DWC request to have the active tool denoted more prominently, like in a different colour or bold, rather then the faint, hard to spot, underline.

@krzaku:

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How did you choose a 220nF capacity? Is there a formula of some sorts? I just found today that Sunon fans are picky about PWM, I bought 3 fans, and 1 of them is not working with PWM power.

For sure there are formulas, look for e.g. RC circuit or for Low-pass filter in Wikipedia.
I just did some simulations in the free LTSpice program to get a rough idea about where I would be with the currents and voltages and it seemed to work fine for the 220nF capacitor I found in my junk box 🙂

Since I did not add a series resistor I wanted to keep the capacitor relatively small in order not to increase the peak currents too much (the wires have some resistance as well as the switching FET. The downside of this is a very high ripple in the resulting DC but seems to work fine for at least the Sunon I'm using. With larger capacitors you get a less ripply signal, but then you should also add a series resistor (a few ohms should be ok) to protect the switching FET.