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Messages - Doomedahab

1
Project logs / Re: Really universal soldering controller
To me fast exchange works only for cold tips, but I still work with sparkybg firmware for T245. I don't have  fingers issue
 Never for me and message is "heater open"
May be it is related to heater resistance  of recognizing time, while in initialization time ( if you switch off and on the station - tip still hot ) it works correct or may be it is not checked.

Ok, thanks for the confirmation. But at least it is clear now: When the tip is removed, the correct message should be "Sensor Open". If that is the case, hot swap works. So what does "Sensor Open" mean, and what is the difference between " Sensor Open" and "Heater Open"?

And more importantly, how do we get the firmware to work around the instability in the design which causes the "heater open" message? Because if you carefully consider what is happening in my system, it must be some kind of instability which causes this. Sparky must have meant for the system to display " Sensor Open" at time of swapping tips, and "Heater Open" is not correct behaviour in this scenario, but some protection measure against a broken tip/short circuit to the mosfets which is incorrectly triggered.

Also, if its related to heater resistance only, why does my hot swap work sometimes, with all tips, no matter their temperature, no matter the order in which I switch? While at other times, the hot swap does not work at all, only cold swap? The fact that in my system this has a direct correlation with touch plate behaviour points to some instability. There is no point in trying to improve the touch sensor, as it is working fine. I am convinced if we find the cause of the hot swap instability, everything will be working perfect.

This will likely require some research by a knowledgeable electrician, with expert knowledge of the unisolder schematics, the firmware, and who knows how to test with a scope. In other words, not me haha.

Or maybe someone can find a way to make a workaround in the firmware to solve this without exactly pinpointing the root cause. Is the " Heater Open" message really needed?

To me fast exchange works only for cold tips, but I still work with sparkybg firmware for T245. I don't have  fingers issue
 Never for me and message is "heater open"
May be it is related to heater resistance  of recognizing time, while in initialization time ( if you switch off and on the station - tip still hot ) it works correct or may be it is not checked.

 
2
Project logs / Re: Really universal soldering controller
Schmitt trigger gate does not change anything in the behaviour of the touch sensing and hot swap behaviour.

Minkok, can you confirm whether your hot swap always works or not? I am pretty sure that the hot swap issue is more fundamental, and has the same root cause as the touch plates reacting to my hand.

Each time the touch plates work fine, and do not react to my hand, hot swap is working 100% also, and the display shows "sensor open" when the tip is disconnected. When I re insert the hot tip, everything works again perfectly, every time.

When the touch plates are responding to my hand, the hot swap also does not work, and when the tip is removed the display shows "heater open". When the hot tip is reinserted, the display keeps saying "heater open" until the cartridge has cooled down.

So, if we find out why sometimes unisolder says "heater open" instead of "sensor open", we will solve hot swap.

3
Project logs / Re: Really universal soldering controller
Thanks, Minkok, I'll look into your suggestions. You're basically doubling contacts to spread the load, right?

Just so you know, this is an On-On switch with no middle position.

Not sure where you get the 7A rating from, it's 6A rated on 250V AC, there's no amperage rating for DC in the data sheet, although for 24 and 12V it should be within it's capabilities. Is 7A a common DC rating for these type of switches?

Anyway, I'd love to have a relay for switching, is that even possible with current firmware?

5
Project logs / Re: Really universal soldering controller
In other news: Since I have a transformer with two 12V secondary windings I decided to add a switch to be able to select between 24V and 12V. The switch is a DPDT type and has a locking lever to prevent accidental operation. Here's the hook up sequence for those interested:
7
Project logs / Re: Really universal soldering controller
Doomedahab, did you try without diode in series?

No, did not test the Nexperia NOR without diode. The other versions I did try. Will test this one too. By the way I found out that if the plates react by hand touch, the hot swap is always compromised as well. The other way around as well: If the touch plates do not respond to hand touch but only to the tool, the hot swap is working 100% correct.

The correct functioning of touch plates and hot swap can be restored after one or more power cycles. This is with the diode in place.
9
Project logs / Re: Really universal soldering controller
Or 4093. The sensor uses gates as inverters, so no difference if it's NOR or NAND. Unfortunately for some weird reason pinout is different.
4106 also may be used and, having 6 gates, dual channel sensor with filtering may be implemented.

MC14093B vs HEF4001B : Pinout looks to be the same: input nA= pin 1, 5, 8, 12, input nB= pin 2, 6, 9, 13, output nY= pin 3, 4, 10, 11.

Would this mean the MS14093B would be usable in the same circuit? Would the Schmitt trigger logic need additional circuitry to work properly?


13
Project logs / Re: Really universal soldering controller
UPDATE: It was a fluke unfortunately. After having Unisolder turned off a while and just now turning it on, hot swap is intermittent again and holder responds to hand touch again.

This does show there is a link between the hot swap not working properly and the behaviour of the touch plates. Has anyone investigated the hot swap issue any further?
14
Project logs / Re: Really universal soldering controller
HEF4001 seems a magical chip haha. I'm not even talking about reaction to hand touch or not.

With this version all of a sudden hot swap is flawless. No matter the temperature, no matter the cartridge, no matter the time between swapping, I get consistent hot swap success. Never had this before. It must be a fluke, and I'm sure tomorrow will be back to normal, but it sure is nice to see.