temperature unstable when using ksger STM32 V3.1 with hakko tips

[Snack_Mr]

hi, i have some problem when using hakko tips to ksger soldering station.

the problem is unstable temperature.

the temperature is stable when using the ksger tips. but using hakko tips, temperature is becomes very unstable (±20 ℃).

I guess there is a problem with the PID value. So I tried adjusting the PID value, but it didn't work.

Does anyone know the PID values when using hakko tips? Or is there another way to solve this problem?

[I tested with these tips.]
KSGER - BL, B2, C08
HAKKO - K, KU, D4

[totalnoob]

You probably already tried this if you already messed with the PID, but you did ensure the correct tip was selected, right?  I.e. ensure that the "K" tip was selected when you inserted the K tip into the handle?  I don't have any Hakko tips to try, but I found it, just like you did, to be accurate with the clone tips.

If you check the CFW thread, someone else is having this issue with the custom firmware, so this may rule out a firmware issue and it may be a hardware issue with the V3.1 board.

[DavidAlfa]

Yeah I had the same problem in the firmware I'm developing, it's something related to some tips, I also had the issue with few cheap non genuine ones.
They need a really long time to recover after the transistor switches off to give accurate readings.
It seems that if you read the temperature too fast, you will read a way lower temperature than real! Very strange.
When it reaches the desired temperature and turns off the output, the tip will have time to recover and then the reading will suddenly rise 20-40ºC.
So the controller lets the tip cool down...and when it switches the power again, the reading decreases again!
And it will keep going up and down without control. Looks totally like wrong PID settings. But it's not!
Start reading here for more details...
https://www.eevblog.com/forum/reviews/stm32-oled-digital-soldering-station-for-t12-handle/425/