Hattusa Pulse

[Hattusa]

Greetings, I want to design a new pulse detector with arduino, what do you think should be the features of this detector? can you share your ideas?

[Hattusa]

I had this PCB made last year, I would like to remake its digital structure using its analog structure with your suggestions. of course for this site

The detector on this PCB does not have a screen, it is directly used with an android mobile phone via bluetooth.

[Hattusa]

This is the analog structure I tested above and want to work on.
a- what screen should i use?
b- Shall we add a button? How many buttons should we add?
c- how about the audio circuit?
d- Should it be android or PC connected? Should bluetooth be added?

[Hattusa]

it seems that no one wants to make a PI detector, and there is not even a suggestion, it is not important...
I will gradually design and share it myself.

[ivconic]

Of course there would be people interested if you had given more details.
Do you have a video demonstrating how that detector works otherwise, with mobile phone?
Can you post the schematic in high resolution so we can see everything more clearly?

[wtrk]

I have sprint layout files of this detector. If you want to develop it I will follow to you

[GeoMax]

Hi,
why do you add a DC-DC converter to step-up the voltage? Just add one more of the 18650 batteries to get approx 12V. So your DC stays "clean" from additional noise from the DC-DC converter

[GeoMax]

Looking at your circuit again, I would skip the DC-DC converter and add another 18650 cell. Then you will have no problem to drive your coil circuit with enough current. Because I do not think that the small DC-DC converter you choosed can deliver enough current for your TX circuit.

[Hattusa]

Of course there would be people interested if you had given more details.
Do you have a video demonstrating how that detector works otherwise, with mobile phone?
Can you post the schematic in high resolution so we can see everything more clearly?

The android version you mentioned is in commercial use. what I want is to redesign and create a free version for site members. is to add the digital part on the scheme I gave. While making this addition, it is to do in line with the suggestions of the users. my aim is to make a detector like felezjo but slightly improved.

PS: Sorry for my English, my accent may be broken as I use translate.

[Hattusa]

Looking at your circuit again, I would skip the DC-DC converter and add another 18650 cell. Then you will have no problem to drive your coil circuit with enough current. Because I do not think that the small DC-DC converter you choosed can deliver enough current for your TX circuit.

It works smoothly with 2s, 2p 18650 batteries, in my trials...
A maximum current of 200mA is sufficient for Tx. This is a full battery and my energy source is sufficient for 5 hours of continuous operation.
I'm thinking of using the TP5100 module for the charging part.

I am considering a new technique for determining the signal tuning points required for discrimination without an oscilloscope of the members that will make this circuit, which worries me at the moment.

[Hattusa]

I have sprint layout files of this detector. If you want to develop it I will follow to you

The drawing in your hand will change, because the pcb in your hand is double sided, whereas I will redraw the single sided PCB for convenience and add it here. Before making this drawing, I would like to get the suggestions of the users. What should be in this detector so that it is easy to assemble and build?

[ivconic]

I have sprint layout files of this detector. If you want to develop it I will follow to you

Would be good to share Sprint files here.
Development of a metal detector that will use the processor; it's not easy, whether it's VLF I/B or PI.
I even have the impression that PI is a much more difficult task, if we want a solid detector at the end.
Look at the AMX project on the forum and it will be clear to you.
Although I have a strong ego... I'm not that unrealistic, I know my possibilities (they are modest),
so I shouldn't promise anything in advance.
It's easy to write a "toy" PI program, there are tons of such projects on github.
When you look at the code that was written; it's all very frivolous and can't provide anywhere near solid performance.
However... it is an easier task to design a "hybrid", a mixture of analog and digital.
If analog processing is good; remains an easy task for the digital part.
No, I can't promise anything and I can't make any commitments. But I want to look at everything, consider and finally see.
What I can promise for sure is that I can write a piece of code that will support LCD, keyboard and generate up to 3 separate timing signals.
Actually I already have it written. It's not my original code, it's code published much earlier and I just adapted it for Barracuda.
So much was possible to get out of the Atmega328P. The code was originally written by Joop.
I have added, modified and adapted some things for Barracuda.
And when I did it; that "digital" Barracuda worked much better than the original.
And that's about the best I can offer for now. To adapt the same code for this hardware here.
I didn't look at the schematic, I didn't look at the details.
The resolution is weak, the schematic should be published in a higher resolution.
Maybe something more can be done on the basis of that schematic.

[ivconic]

The android version you mentioned is in commercial use. what I want is to redesign and create a free version for site members. is to add the digital part on the scheme I gave. While making this addition, it is to do in line with the suggestions of the users. my aim is to make a detector like felezjo but slightly improved.

PS: Sorry for my English, my accent may be broken as I use translate.

Phew!
That's too ambitious a wish, my friend!
FelezJoo was designed by a top developer who I still admire to this day.
Since I know the Atmega328P and its architecture very well; I am able to estimate how much the code written for that processor is worth.
And take my word for it; FelezJoo is a work of art!
Probably the maximum of what can be extracted from a processor of the Atmega328p category.
Especially if one chooses the direct sampling method.
The author of FelezJoo PI is a great connoisseur and a top expert.
I will repeat; the task will be somewhat easier if direct sampling is avoided and the analog part is done well.
That's why I asked to see a video demonstration and how it works. If you have a link, video, anything; share here.
Just as it is already built with Android, I would like to see it work, the simplest tests in the air.
By this I can judge whether it will be worth using the analog part for a new project or not.
Although some "big experts" on forum would disagree with me; however, just looking at the schematic can't say everything.
But schematic and video demonstration can show a lot.
...
Your English is understandable, no problem.

[Carl-NC]

It works smoothly with 2s, 2p 18650 batteries, in my trials...
A maximum current of 200mA is sufficient for Tx. This is a full battery and my energy source is sufficient for 5 hours of continuous operation.

You could just design the TX circuit to run on 7V and then the boost is not needed. I have designed PI circuits as low as 3V.

[Hattusa]

hi, since no one has received a suggestion, I have this analog structure for digital;
a- I added 1 x 16x2 lcd
b- I added 3 buttons
c- I added an hc05 bluetooth module for future use for android or PC (I will activate it when the project progresses)
d- it is the sound layer that upsets me. for two audio outputs, the atmega328 is a bit old architecture, there are 3 timers inside. I couldn't activate timer0 because timer0 is used for millis() and delay, I couldn't use timer1 because timer1 is used for spi, only timer2 remains, I couldn't use it in the sound stage because I used it for firing the mosfet and timing in TX. i wish i could use a more powerful MCU sure it would be easier. But for members I have to use atmega328.

in conclusion; I created the schematic, I will publish it here very soon, I am drawing the PCB schematic at the moment. I will share it too. It's not too difficult for me to make a VLF, PI, IB, magnetometer or resistor meter because I've done it many times. Anyway, this PI I'm going to share seems pretty simple to me...
All I need is time. because the analog structure I tested is the board I created from old scrap PCBs. When I draw and print the final circuit PCB, I will share the videos you want.