ADJUSTABLE TEMPERATURE SOLDERING STATION

this is the first test video i uploaded to my new youtube channel so please forgive the poor quality of the video.
in the next videos im making i will provide a more detailed presentation and HD video of this project.
if you don't wanna miss it please subscribe.
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this is an adjustable temperature soldering station using arduino uno or pro mini to sense the temperature and control the soldering iron.
this circuit-project is used many months now in my workshop.i built 4 of them and gave one as a gift to a friend and all of them work flawlessly.
the solder iron used is a cheap hakko clone which uses a type k thermocouple for temperature sensing.
notice that i didnt use the L7809 regulator shown in the schematics because it was geting too warm.instead i used a buck converter for the 9 volt output for the lm358 and then a L7805 regulator  to power the arduino.you can also replace the IRF640 with IRF540 or similar,i tryied the 540 and it wasnt getting warm at all.even without a heatsink.these modifications are included in the pcb and details provided below.

prepairing the pcb

everything you need is here
arduino code
components placement
pcb
silk complete
the pcb project created with pad2pad
and you can download it from here
pad2pad pcb file
you need to have pad2pad installed(free) to open this file..