Arduino Nano PI Main Discussion

[Olly]

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

[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.

[Matt_Rowe]

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

[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.

[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.

[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]

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 .....

[Teleno]

for those who are interested, the total inductance of l1 + l2 is 540uh. 473uh should have been the sums, but mutual induction has an impact ...

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.

[lamoiz]

for those who are interested, the total inductance of l1 + l2 is 540uh. 473uh should have been the sums, but mutual induction has an impact ...

[lamoiz]

hi, yes indeed it is a classic coplanar in series .. usable on all the PI ..mpp, surf classic, surf nano ..
L1 160mm, it is the smallest ... so that of the interior ..

[surfdetector]

is it a classic dual field with two coil in series, which is l1- inner or outer,?

or did you split it into tx and rx coil system?

Looks like a classic Dual Field (series)

[bernte_one]

is it a classic dual field with two coil in series, which is l1- inner or outer,?

or did you split it into tx and rx coil system?

[Qiaozhi]

if you want the characteristics of coil 325 here they are:
l1: 160mm 160uh r 0.8ohm
l2: 320mm 313uh r 1.4ohm
litz wire 0.7 mm (175*46)
damp l1 312ohm
damp total 300ohm.
this gives 11 or 12 us on its delay .. an 18k 3grm alliance is detected at 24 cm In the wet sand of the beach. 2 eur to 32 cm.

Excellent results. Thanks for sharing.

[MartyJ1963]

Nice results Lamoiz!,,,Thanks for your coil specs. Regards, Marty.

[lamoiz]

for the shielding, two layers of electrical tape, then a spiral sheath, then a layer of paper tape, graphite paint for two-layer guitar pickup, a copper drain wire twisted over the entire winding, and a layer of paper tape , for protection before resin casting. le cable est kx6a 60pf /m