DIY Arduino hot air SMD rework station.
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Yes, these boards are using the same micro controller, atmega328.
The operation amplifier is amplifying input voltage (several millivolts) from thermo couple inside the iron, The 500k trim potentiometer adjusts the Operation amplifier coefficient. There are a lot of iron handles in the world so they have different parameters and generate different amount of electricity. Adjusting the potentiometer, you change the amplification coefficient of OP amp. The purpose is to convert input voltage of thermocouple to about 5v that is suitable for Arduino analog comparator on pin A0.
Use external thermometer to check the actual temperature of the iron!
Select 'tune' menu item from the setup menu. The iron starts heating. The controller will display the temperature readings on A0 pin in the internal units (0-1023) in this mode.
Rotating the encoder you can adjust the supplied power to the iron.
Try to heat the iron to 400 degrees and adjust supplied power to keep this temperature.
Now rotate the multi-turn 500k potentiometer handle to get the sensor readings near 900.
Press and hold the encoder handle for about 2 seconds. The initial setup procedure now is complete.
Have you any question?
You cannot avoid zero-cross detection in the controller, because this event is used to manage the Hot air gun: the controller counts these events to produce different power to the hot air gun.
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