Arduino Nano PI Main Discussion

[lamoiz]

Is there a ratio that has to be maintained between the inner an outer inductances? I guess the intention is to null the transient at the receicing coil.

2: 1 ratio for the dimensions. the coil is made for a pulsed induction detector. this one has the role of tx and rx alternately. I did several tests; inductors equal like 150 and 150..100 and 100 but in the end, the best was a 2: 1 ration also for the inductors .. maybe somebody answer this question ???? ... i use of the litz wire, therefore, the capacitance is very low. the secret lies in the damping of the entire assembly. that's the secret .....

[6666]

2: 1 ratio for the dimensions. the coil is made for a pulsed induction detector. this one has the role of tx and rx alternately. I did several tests; inductors equal like 150 and 150..100 and 100 but in the end, the best was a 2: 1 ration also for the inductors .. maybe somebody answer this question ???? ... i use of the litz wire, therefore, the capacitance is very low. the secret lies in the damping of the entire assembly. that's the secret .....

Could you tell us a bit more about your damping ? thanks.

[lamoiz]

Could you tell us a bit more about your damping ? thanks.

hi, the damping of l1 is 312ohm, the setting is done with the potentiometer tool described here by George. the method is to start with the coil l1, then to do the same thing on the totality of the two .. the total damp is at 300ohm. the Q is 1.25 before damping. I use 0.040mm litz wire because the srf is 850khz to 1.5mhz. But we leave the NANO subject, we can restart a subject in the coils ...
I specify that the direction of rotation of the fields is important,! otherwise they cancel and the inductance drops.

[Olly]

Completed Arduino Nano PI

My wife also wanted one, so had to make two.


Stems from China via Amazon at around ?20 each (4 weeks wait though)
Batteries are 3x LiIon cells which slide into the bottom section of the case.
The case, panels and knobs are all 3D printed, as is the coil former on the LH detector.



Off for a beach holiday in Jersey in a few weeks time to put them to the test.
Many thanks all for the help.

[Matt_Rowe]

Olly, those are a very professional looking build, nice job, and good luck on the beach

[MartyJ1963]

Great job Olly! I bet your wife is well pleased with the matching pair of pro-looking detectors! Don't forget to post the results of your finds in Jersey,,,Enjoy your Hols! Regards, Marty.

[Olly]

Thanks chaps, you're too kind.
Will definitely report back on any finds.

[Qiaozhi]

My wife also wanted one, so had to make two.
[ATTACH=CONFIG]55433[/ATTACH] [ATTACH=CONFIG]55434[/ATTACH]

Stems from China via Amazon at around ?20 each (4 weeks wait though)
Batteries are 3x LiIon cells which slide into the bottom section of the case.
The case, panels and knobs are all 3D printed, as is the coil former on the LH detector.
[ATTACH=CONFIG]55430[/ATTACH] [ATTACH=CONFIG]55431[/ATTACH] [ATTACH=CONFIG]55437[/ATTACH]
[ATTACH=CONFIG]55435[/ATTACH] [ATTACH=CONFIG]55436[/ATTACH] [ATTACH=CONFIG]55429[/ATTACH]
[ATTACH=CONFIG]55432[/ATTACH]
Off for a beach holiday in Jersey in a few weeks time to put them to the test.
Many thanks all for the help.

Great job!
Hope you have a wonderful holiday, and show us your finds!

[6666]

Great work Olly

[6666]

hi, the damping of l1 is 312ohm, the setting is done with the potentiometer tool described here by George. the method is to start with the coil l1, then to do the same thing on the totality of the two .. the total damp is at 300ohm. the Q is 1.25 before damping. I use 0.040mm litz wire because the srf is 850khz to 1.5mhz. But we leave the NANO subject, we can restart a subject in the coils ...
I specify that the direction of rotation of the fields is important,! otherwise they cancel and the inductance drops.

Thank you.

[MartinB]

My wife also wanted one, so had to make two.


Stems from China via Amazon at around ?20 each (4 weeks wait though)
Batteries are 3x LiIon cells which slide into the bottom section of the case.
The case, panels and knobs are all 3D printed, as is the coil former on the LH detector.

Off for a beach holiday in Jersey in a few weeks time to put them to the test.
Many thanks all for the help.

Looks great. Thanks for sharing

[dingbatca]

Just figured I would post up some fun pictures of my first field tested NanoPI. Worked well at the local river (Finds1). Managed to give my Nokta Simplex+ a challenge in wet sand beach condition. This is FAR from my final, polished version. Just proving out the mechanical stuff. I must admit my foam backed coil is rather light weight! ;-)

[Matt_Rowe]

dingbatca, the build looks good, great way to test first before putting in a lot of work for a final result. does your coil make a pretty good overlap to reduce area covered.

[Qiaozhi]

Just figured I would post up some fun pictures of my first field tested NanoPI. Worked well at the local river (Finds1). Managed to give my Nokta Simplex+ a challenge in wet sand beach condition. This is FAR from my final, polished version. Just proving out the mechanical stuff. I must admit my foam backed coil is rather light weight! ;-)

Great to see that some builds actually make it off the bench and into the real world.

[6666]

dingbatca what distance are you getting on a nickel ?