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

[Emersonpaz]

Emersonpaz I have similar coil, Outside diameter 12cm, wire i think is 0.5mm. For better performance you have to make less groves in order that the wire don't cross so many times to keep the capacity low. Also need to use as a former material with good dielectric constant (teflon, xps). Good quality build of pcb, i like it!
Vadim18 this part i understand with the coil shield. But what about Pcb shield (aluminium or graphite paint for case/box)? PCB ground plane is 0V.

[ATTACH]54770[/ATTACH]
[ATTACH]54771[/ATTACH]
[ATTACH]54772[/ATTACH]

My coil has an internal diameter of 12.5cm and an external diameter of 20cm I used 0.7mm wire. thanks for the tip

[Emersonpaz]

Use um joystick para o painel substitui os cinco bot?es e a bateria adicionei mais duas c?lulas para atingir a voltagem necess?ria.

[Qiaozhi]

Use um joystick para o painel substitui os cinco bot?es e a bateria adicionei mais duas c?lulas para atingir a voltagem necess?ria.

Very nice ... but please write in English as per the forum rules.

[Emersonpaz]

ionut_mtb as the ABC numbers were with this coil it was necessary to adjust the value of the damping resistor?.with my bobiba the values were high A411 B754 C816. I will make the adjustment with the potentiometer to see the closest correct value.

[Mr.Jaick]

Sr. Jack information for adjusting the ABC is not in the link below https://www.geotech1.com/forums/show...il-Felezjoo-pi

i'm not looking for ABC adjusting info
i want to know how to change the words on the LCD

[Qiaozhi]

i'm not looking for ABC adjusting info
i want to know how to change the words on the LCD

You will need the source code to do that properly, and the designer has no intention of releasing it.

However, you may be able to hack the hex code, depending on what it is that you actually want to change.

[Vadim18]

Emersonpaz I have similar coil, Outside diameter 12cm, wire i think is 0.5mm. For better performance you have to make less groves in order that the wire don't cross so many times to keep the capacity low. Also need to use as a former material with good dielectric constant (teflon, xps). Good quality build of pcb, i like it!
Vadim18 this part i understand with the coil shield. But what about Pcb shield (aluminium or graphite paint for case/box)? PCB ground plane is 0V.

[ATTACH]54770[/ATTACH]
[ATTACH]54771[/ATTACH]
[ATTACH]54772[/ATTACH]

I think graphite paint will be enough for box shielding, just to protect from any static. All radio junk will come from coil, in any case.
You can isolate digital part from analog by aluminium shield, i drawed this shield in your photo.

[ionut_mtb]

ionut_mtb as the ABC numbers were with this coil it was necessary to adjust the value of the damping resistor?.with my bobiba the values were high A411 B754 C816. I will make the adjustment with the potentiometer to see the closest correct value.

I tried to make the coil as close as possible to the designer recommend advice. My numbers are lower, i did not tried yet the potentiometer to adjust. 390 ohm for dumping is ok for me, i checked with oscilloscope. First number can be little adjusted by modifying the pulse width. I think your coil has different inductance/resistance- and result is A411. Good job you did with the project.

[ionut_mtb]

I think graphite paint will be enough for box shielding, just to protect from any static. All radio junk will come from coil, in any case.
You can isolate digital part from analog by aluminium shield, i drawed this shield in your photo.
[ATTACH]54781[/ATTACH]

Thanks for the tips! Will see if i have enough space for the analog/digital shield to fit inside box.

[Mr.Jaick]

You will need the source code to do that properly, and the designer has no intention of releasing it.

However, you may be able to hack the hex code, depending on what it is that you actually want to change.

I just want to change the intro <<METALDETECTOR BLAH BLAH>>
i tried changing the ASCII code of the intro and save the HEX then upload that hex to the micro it didn't work
tried with TNM and Extreme Burner

[Xtrem]

I just want to change the intro <<METALDETECTOR BLAH BLAH>>
i tried changing the ASCII code of the intro and save the HEX then upload that hex to the micro it didn't work
tried with TNM and Extreme Burner

maybe the programm dont let you to make changes, maybe it check the checksum. i plan to try it too. if i succeed , i will tell you.

[Mr.Jaick]

maybe the programm dont let you to make changes, maybe it check the checksum. i plan to try it too. if i succeed , i will tell you.

I'm not an AVR dude but i'm also trying and if i succeed i'll share it here
Thank you Xtrem

[BC547]

I just want to change the intro <<METALDETECTOR BLAH BLAH>>
i tried changing the ASCII code of the intro and save the HEX then upload that hex to the micro it didn't work
tried with TNM and Extreme Burner

If you patch the hex file manually, you need to update the checksum on each modified line ( last byte of the line ):
https://en.wikipedia.org/wiki/Intel_HEX

[ricalbertvig]

Has anyone tried this version felezjoo full edit 3.35_1397-9-28-13-59?

[Mr.Jaick]

If you patch the hex file manually, you need to update the checksum on each modified line ( last byte of the line ):
https://en.wikipedia.org/wiki/Intel_HEX

I calculated the checksum in EEPROM section put it in the last data pocket but no results

probably not the right place to do the checksum
any recommendations?