DIY Arduino Nano Soldering Station V4

DIY Arduino Nano Soldering Station V4. Hello everyone!. I made a new version of the T12 soldering station based on Arduino Nano, a few changes are made to the software, now it shows the PWM power level that the sation applyes to the tip, other chenges I made is that I replaced the L7805 voltage regulator with Mini360 buck converter and I increased the value of the R5 from 1K to 4.7K because was very hot when the soldering station was working and I made a new and beter PCB design, and lastly I made a beautiful 3D printed case.
Link to original project of Stefan Wagner:
Youtube video:    • T12 Soldering Station - ATmega328P  
EasyEDA site: https://easyeda.com/wagiminator/z-sol...
Link to Software, Schematic, PCB and STL files:
https://drive.google.com/drive/folder...
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