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Surely, you can. Change the pins accordingly.
There is no main.cpp file in this project, and no i2c display also.
I believe the stm32 firmware can be used as is to manage the 907 soldering iron. The only thing you have to change is the hardware. Look at both schematics, There is a pit that controlls the iron power (D10 in ccase of Arduino and PA0 in case of stm32). You can copy hardware driver of mosfet (based on T1 and Q2) from this schematics and use it in the stm32 based controller. Yet, arduino A0 pit used to check the soldering iron temperature and stm32 controller uses PA4 and PA2 pins to controll the temperature and current through the soldering tip. If your 907 handle have opto-couple to check the temperature, you have to connect it like stm32 soldering controller.
And you have to connect thermistor to the PA6 pin. As soon as your handle has no thermistor, you can put it inside the controller box.
Of course, you cannot change the 'tips' because you cannot disconnect it from the handle, but the controller should work.
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