The inductor is the part that is responsible of detecting the presence of the soldering Iron or any king of ferrous metal that enters its field. The inductor is built around a 12Cm x 17Cm path. The inductor coil is held in place by four Crackers as shows in the images above.

Using four screws tight down the two fans to the side of the wood board

The control board is based on the Arduino Nano. This board contains all the necessary hardware for power regulation and Fan switching. Please see the circuit above to get in touch with all the connections. The board is little junky because it was built the hold an Esp32-can to run a ML code to recognize the soldering iron using a camera “I accidentally burned it”