You can use Hot Air Desoldering Gun Handle FOR 858 858D 898D 852D Soldering Station Hot-air Rework Station
Arduino Nano
i2c OLED 0.91'' (128x32 pixels)
and any 240AC Solid State Switch like CPC1998
PCB from oshpark: https://oshpark.com/shared_projects/ofOX8gMQ
P: 60
I: 3
D: 100
If your PID control goes crazy, then try these PIDs:
P: 40
I: 3
D: 30