i of course have been all day testing it and trying to get it as close as i can. do you know why its doing the overshoot no iron thing as some others mentioned? i have it testing within 3-4deg now. if i could get that no iron thing fixed this would be great to use!! and i do not mean to ask stupid questions i appreciate your work on this very much and now that i understand i do not need to ask the pid question again. ill do some calibrations for you with ksger and genuine hakko tips tonight and post results.
Again I don't pretend so be rude by any means. It's just that I can't magically fix every single tip/board, specially not having it.
I didn't invent PID, neither made the PID implementation in this firmware. I tested with a lot trial&error, following internet tips.
Is the tip new? Does that happen with all tips? Try to measure the real temperature.
>600ºC will quickly destroy the tip, also the tip will start glowing red around that temp.
700ºC+ will be clearly red.
And always remember that 700ºC can't cool down to 400ºC in matter of seconds. So it must be some reading issue.
Some ksgers have terrible power supply noise causing a lot of problems. They have a 3.3V switching supply, stepping-down from 24V.
And all the analog and digital circuitry is powered with that, without any kind of filtering else than few ceramic capacitors... Not the best way to interface 20mV signals!
Do you have oscilloscope? Watching the waveform would be a great way of debugging the problem.
If you want to be 100% sure the ADC isn't reading inductive spikes from the heater, increase the ADC delay to something crazy, ex. 100mS.
Yep, 50% of the power will be lost. But it's just for testing.
Follow these guides!