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

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  • Originally posted by ionut_mtb View Post
    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

    Comment


    • 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.
      Attached Files

      Comment


      • Originally posted by Emersonpaz View Post
        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.

        Comment


        • 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.

          Comment


          • Originally posted by Emersonpaz View Post
            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

            Comment


            • Originally posted by Mr.Jaick View Post
              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.

              Comment


              • Originally posted by ionut_mtb View Post
                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.
                Click image for larger version

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                Last edited by Vadim18; 03-25-2021, 07:57 PM. Reason: added photo

                Comment


                • Originally posted by Emersonpaz View Post
                  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.
                  Click image for larger version

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ID:	359428

                  Comment


                  • Originally posted by Vadim18 View Post
                    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.

                    Comment


                    • Originally posted by Qiaozhi View Post
                      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

                      Comment


                      • Originally posted by Mr.Jaick View Post
                        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.

                        Comment


                        • Originally posted by Xtrem View Post
                          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

                          Comment


                          • 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

                            Comment


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

                              Comment


                              • Originally posted by F117 View Post
                                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
                                Click image for larger version

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ID:	359460
                                probably not the right place to do the checksum
                                any recommendations?

                                Comment

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