PID controller for heating chamber

This is the code for a simple device that can control the temperature inside a hot chamber, ideally for a 3D printer. It works with an arduino (any type should work).

https://youtu.be/xTOFt23Ags4

the outputs are:
1pin for the temp control (basically the control pin for a SSR)
3pins for a addressible LED strip (if you want to add light)

the inputs are
POWER (5V + GND)
Temp sensor
potentiometer
PCB push switch


You will need the following:
-Arduino (UNO, NANO, Pro Micro...)
-OLED display SSD1306_128X32 IIC
-10K potentiometer
-100K temp sensor + 100K resistor
-a blank PCB
-1 PCB switch

Optional:
-addressible LED strip (led ws2812b is perfect)
-the enclosure files I made (and 3D print it). It fits a Arduino pro micro.
-the following libraries : PID, Fastled and U8glib

for the assembly, you will need to tap (M2) the front cover and use 4 M2 screws (6 or 7mm are good).
for the code : have a look on my github : https://github.com/Benn25/PID_control

I did