felezjoo PI(the best pulse induction metal detector that I made until now)

[Kostasp]

HI is this pcb in post 1 good I have made it and can't power on . It burn the atmega328

[basellafe]

yes its good no problem with it

[MartyJ1963]

Hi all,,,,,I don't know if this will help anyone but I have 2 x working Felezjoo's and for both I use 3 x 18650 batteries with a DC Adjustable XL6009 Step up step down converter and they work fine and give me about 6 hours detecting time. The 3 x 18650 give me 12v but I adjust the step up converter to 18v and it's been fine,,,no overheating or any other problems. Hope it helps someone. Marty

[Kostasp]

this is the pcb and a second i have fix the C24 but dont start

[basellafe]

Test the voltag on lines with out mecrocontroller and test the battery amp it should be at least 1.8amp

[Kostasp]

The voltage in socket with 28 pin ok .but how I now the right for all the pins do you have a photo. do you now how to check the atmega328p if is good or have burn

[basellafe]

U shuold got a beeeb in first start if not check atmega with reprograming

[Kostasp]

i cant reprograming he says no communicate with target chip
i use this USB-ISP-Programmer-for-AVR

[basellafe]

i think its burn

[Kostasp]

is any way to check the chip thanks

[basellafe]

just buy another one and test its cheep and safe time or re biuld a secret to test

[Kostasp]

Thanks do you have a good working pcb to see

[basellafe]

this project want many of mecrocontroller to succes look if U reprogram atmega and give U
the code (ffffff) or (000000) it mean the atmega burn

[tenere750]

Can somebody helping me out? Can somebody give me details about building a working coil 60cm

[waltr]

Can somebody helping me out? Can somebody give me details about building a working coil 60cm

This is a PI detector which typically is NOT sensitive to coil. Most mono-coils of 300 to 500uH should work.
Lots and lots of coil info on these forums. Just wind a simple coil to test circuit.