OK! This is the only difference ? Or has

OK!
This is the only difference ? Or has something to do with PID control?
From what I understand till now from here, I see that this firmware use a PID control only for TOP heather... Is true?
I`m very sorry, maybe was discussed this before in Russian...

Thank You!

Самодельная ИК паяльная станция (часть 5)