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Messages - Doomedahab

1
Project logs / Re: Really universal soldering controller
I've assembled my PCBs and was starting the testing process and have had a few issues:
  • I hooked up a C245 tip and it immediately started glowing. I immediately shut it down so while it looks a little heat stressed, I'm hoping it'll still work.
  • It was detecting DC instead of AC (I didn't realize this until I was troubleshooting the glowing issue).

After some searching on here I discovered that the DC issue was likely caused by the zener diodes. Sure enough, it looks like I ordered 6V zener diodes instead of 3V ones (I think I got 1 number wrong in the part number). I'll order replacements before I do anything else, but to try and minimize the number of orders I have to place, I've got a few questions:
  • Where should I check to see if any damage was done? Everything around those diodes looks to be able to withstand the voltages they were getting and they don't look visibly damaged, so I'm not sure if I should be concerned.
  • Is the controller thinking it's being powered with DC when it's actually being powered with AC a possible cause for the glowing tip? Are there any other things I should investigate for that issue?
  • Is there a way to check that the handle is wired properly internally? I got a T245 handle from AliExpress (though I was using genuine JBC tips) and I'm a bit concerned that they didn't follow the proper pinout as at least the wire colors inside didn't seem to match (see the attached image)

I had the same issue with an Aliexpress T245 handle: The POS and NEG wires were reversed. Just make sure you account for that when you hook up the connector. It will then work as expected (although I did buy an original handle in the end).
2
Project logs / Re: Really universal soldering controller
Hi Catear,

The strange thing is that I have absolutely no sign of noise when I use the newest BSS138 N channel mosfet version of the sleep sensor that Minkok designed. On the C245, there is no problem at all, only the C210 behaves weird with the constant switching between ST/HT. The sleep sensor works perfectly otherwise.

An easy solution would be to add an option in the FW to remove the beep signal once ST temp has been reached, and the option to remove the HT/STWT indication in the screen.

Would you be able to provide an updated FW like that?

One more finding: The rapid HT/ST switching with C210 on your FW does not appear when I use the standard C210 iron config values. But when I use the config aenu to fine tune the parameters so that the temperature is accurate, the error occurs.

So again, the error is somewhere in your FW. Is there any hope to get an updated FW from your side?
4
Project logs / Re: Really universal soldering controller
Hi again. I redesigned the contact sensing board. Hot, direct from the working table, Now it is much simpler and I expect to work more smoot. Again it has 2000V protection ( static and peak ). Use 20V GS for the BSS138 version. That sch has not so strong output filtering compared to the last and is more stable. Unfortunately, it is not tested, use at own responsibility, the time someone checked it and confirm. Now I publish only one board and sch

I can report that this version is working very well indeed. There is no hint of noise in the software graphs in the cool down phases from work temp to holder temp, and from holder temp to sleep temp. Also, the holder is immune to my hand touching the plates. Tip change works flawlessly as well.

I used BSS138 mosfets, and 150k resistors for R5 and R6.

Good work Minkok!
5
Project logs / Re: Really universal soldering controller
st and ht only represent that the state has changed, but it does not mean that the temperature has been reached, so when the sleep pcb is unstable, the state will change back and forth, but the temperature is too late to change.

Hi Catear,

The strange thing is that I have absolutely no sign of noise when I use the newest BSS138 N channel mosfet version of the sleep sensor that Minkok designed. On the C245, there is no problem at all, only the C210 behaves weird with the constant switching between ST/HT. The sleep sensor works perfectly otherwise.

An easy solution would be to add an option in the FW to remove the beep signal once ST temp has been reached, and the option to remove the HT/STWT indication in the screen.

Would you be able to provide an updated FW like that?
9
Project logs / Re: Really universal soldering controller
1. You cannot calculate the resistance from the iron.c You can measure it with a multimeter.
2. The C1 parameter on the profiles is millivolts to degrees Celcius coefficient for TC sensor, or resistance (in omhs) to temperature coefficient for resistive sensor, if it is linear. In other words, if the TC is giving for example 1.5mV, and C1 is 123, the temperature is 1.5*123=184.5 degrees Celsius above the cold junction (room) temperature. C0 is the offset - it is usually 0 for TC sensors.

For profiles with many coefficients, it is a polynomial instead, so C1 does not give the complete picture. The temperature is calculated this way:

t = c0 + (x^1)*c1 + (x^2)*c2 + (x^3)* c3.....

, where t is the temperature in degrees Celsius, and x is either millivolts fom the TC or ohms from resistive sensor. The coefficients are either given for a specific senssor from it's manufactuurer, or calculated by polynomial regression tool from measured or provided data for resistance or TC voltages at different temperatures. Here's pretty nice online tool for polynomial regression calculation from given data: https://arachnoid.com/polysolve/

Is the C210 profile polynomial?
10
Project logs / Re: Really universal soldering controller
The ideal effect can be obtained by using my firmware. First calibrate with 10r, and then adjust c1 so that each iron rod can melt the solder at the same temperature

I agree in theory, but somehow I cannot get the same result with C210 on your FW compared to Sparky FW. Changing C1 on C210 does not seem to have much effect.

I will patiently wait on your FW with the standard iron profiles based on the latest Sparky FW. I will say that you did a really great job on the rotary encoder code. It is much better.

EDIT: I was too careful I guess, because changing C1 to 145 did the trick. Both C245 and C210 now melt at the correct temp
11
Project logs / Re: Really universal soldering controller
Trimmer MUST be set to show as close to 10 ohms as possible, when calibrating. When it is away, the amplifier gain is not set properly.
Also, you must test the current sources. For surrent of 128 in the calibration menu, the current between SenseA/SenseB and Vout- shoud be as close to 382.8125uA. If it is off by more than 1% (ideally if shoud be within 0.1%, if the voltage reference and the resistors are the correct one with 0.1% tolerances and the current source mosfets and opamp are not fake ones), then the current sources themselves are not sunctioning propery.

Although the current sources are not that important for thermocouple measurement (maybe 1-5 degrees), they directly impact the resistive sensor measurement and along with amplifier gain setting the end result can be way off.

This is very important indeed. To illustrate: I re calibrated with two 0,1% 10 ohm resistors. One resistor gives a R: value of 1001, the other 997. When I take this as the calibration, the difference between the two irons is only 6 degrees instead of 25 degrees with my previous calibration value that I changed slightly when calibrating with pure lead.

This means to me that calibrating with melting temp can give a good result for a specific tip, but it will throw off the calibration of other tips/irons. The best thing is to accept a small offset per tip, and make sure you calibrate as close to R: 1000 as possible for most consistent behavior.
12
Project logs / Re: Really universal soldering controller
I appreciate both of your responses. The bit of information I was missing was that the intention is for the JCB-style connectors to be replaced with alternative ones that are wired up to be electrically compatible while the original ones are not. That clears up my question and the documentation makes sense to me now taking that into account.

Thanks!

You're welcome. Please make sure to use good quality connectors. I use Amphenol T 3527 100 and Amphenol T 3524 501. Available at Mouser.
13
Project logs / Re: Really universal soldering controller
Some parameters of the red line as shown in the figure above, just modify them on the menu.


The values to change are GAIN and C1, correct? so for C245 GAIN = 87, C1= 41.85, for C210 GAIN = 202, C1 = 122.94?

It is strange: When I change like above, C245 works as expected, same as original FW. But C210 still too hot by 25 degrees compared to the original FW. So maybe there are other parameters I need to change?
14
Project logs / Re: Really universal soldering controller
The information from page 1 that you're referring to again to me still seems to indicate that it's not possible to wire up a receiving connector for C245/C210 handles that'll transparently accept either style of handle based on the pinout differences between them, and I'm still looking to confirm whether or not my understanding of that is correct.

To me the documentation seems to only describe how to connect either one style of handle or the other, but not both in such a way that either can be plugged in and just work transparently.

Use an 8 pin socket and connecor, and follow the connection schematics on page 1, even if you find them not logical. They work. All irons can be connected on the same 8  pin receptacle. It is true that the T210 and T245 are connected differently electrically, but I assure you this is correct.
15
Project logs / Re: Really universal soldering controller
I can recompile, but there are more than a dozen handle parameters that need to be modified. It may take a lot of time and check, because the code has been changed a lot, and it can not be completed by simply copying and pasting. Wait for me to change it. , I will upload again. But it will take some time

That sounds great, thank you !!

Can anyone in the meantime let me know what the standard parameters are for T245 and T210?