Pulse Induction Metal Detector "Spirit Pi 4 Pro A"/ New version

Pulse Induction Metal Detector "Spirit Pi 4 Pro A"/ New version
The new version of metal detector is ready. We will have three different versions with the same board. This version of this metal detector will be the most simple, this version does not need a screen or a smartphone, works with a speaker. The second version will be with LCD screen and the third with smartphone. For all three versions we will use the same board only change the sketch for arduino.
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