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Special parts needed
For this project there are some parts required that a lot of people do not have in their regular smd parts drawer.
7 Segment Display:
We used a very low cost 3x7 segment display and got it off aliexpress.com. If you browse for LD-3361AG you will find various versions of this display. We used a 0.36" one in green with common cathode. You can use other colors as well, but you should make sure, that the resistors limiting the current through the LEDs might have to be adjusted.
Soldering Tip:
As a soldering tip we are using the WELLER RT1. It costs about 38 Euro and uses a standard 3.5mm three-pin audio plug (like your headphones). You can buy it with different tips that are not interchangeable so make sure you order the one you think suits you best. We use the 0.2mm needle tip a lot and are very satisfied.
Hall Sensor:
For detecting whether or not the soldering iron is resting (and not in use) we are using a hall sensor inside the handle that will get trigger by a magnet. The hall sensor is a bipolar analog linear hall sensor (e.g. SS39ET/SS49E/SS59ET series).
If you do not plan on using it you can set the threshold for the sensor to zero (in cofnig.h). This will disable the code concerning the rest detection.