Arduino Nano PI Main Discussion

[6666]

The RPi Pico's ADC has 12-bit resolution. At least that's what it says in the datasheet.

Just a question about this pico thing, are you planning to use it to sample just one point on the delay curve out of the preamp ?

[6666]

If we supply the 4066 with a single 5 volt supply
then it opens and closes normally,
but the analog signal that is managed and passes through
it, this must also be from 0 to 5v. thats why i reversed the
input signal.

Understood, thanks.

[Qiaozhi]

Hi George, my book arrived earlier from the USA than expected, good job on the book nice clear schematics etc.

Thanks.

Just a question about this pico thing, are you planning to use it to sample just one point on the delay curve out of the preamp ?

I haven't done anything else with the RPi Pico yet, as I've been side-tracked onto something else. The Pico is immensely more complicated than the Nano, and may not actually be a good candidate for a Geotech project, but I'll get back to it at a later date.

[gbrowne]

True, but not sure if thats at the flat-out speed though ? Will look further.
Do you know if anyone has ever tried digitising and then analysing the curve with a DSP ?

[Qiaozhi]

True, but not sure if thats at the flat-out speed though ? Will look further.
Do you know if anyone has ever tried digitising and then analysing the curve with a DSP ?

Maybe. I haven't investigated this closely yet.

Several people have tried digitizing the decay curve in the vain hope of using the data for target discrimination. Usually they start off very confidently, then get into an argument with someone in the forum and disappear into oblivion to consider patenting the idea, and making vast amounts of money from commercialization. Spoiler ... of course, none of this ever happens.

[waltr]

Maybe. I haven't investigated this closely yet.

Several people have tried digitizing the decay curve in the vain hope of using the data for target discrimination. Usually they start off very confidently, then get into an argument with someone in the forum and disappear into oblivion to consider patenting the idea, and making vast amounts of money from commercialization. Spoiler ... of course, none of this ever happens.

I am one that has experimented with digitizing the decay curve. Used the front end of my HammerHead2 and a PIC32 processor. I did an exponential curve fit to obtain a TC. This worked fairly well for well defined non-ferrous targets like coins but odd shaped targets and iron gave odd results, TC could be anything so really did not discriminate ferrous/nonferrous.
I never wrote this up and posted on Geotech but did write up some of the PIC32 code methods used to generate signals.
Once I get some time I would like to revisit this with the VooDoo circuit that has ferrous discrimination.

[godigit1]

I am one that has experimented with digitizing the decay curve. Used the front end of my HammerHead2 and a PIC32 processor. I did an exponential curve fit to obtain a TC. This worked fairly well for well defined non-ferrous targets like coins but odd shaped targets and iron gave odd results, TC could be anything so really did not discriminate ferrous/nonferrous.
I never wrote this up and posted on Geotech but did write up some of the PIC32 code methods used to generate signals.
Once I get some time I would like to revisit this with the VooDoo circuit that has ferrous discrimination.

Hi Waltr

Im thinking this is still very useful even if were not getting fully accurate disc or even iron rejection. (even a VLF does Not) I think there could be data value there translated into the field.

With any detector Ive used after about a 1000 targets or so you start to really notice the nuances of the detector.

With Pi tied to a numeric VDI scaled off the TC it would take several weeks in the field but patterns may start to emerge and you could disc targets by TC (for small nuggets on shallow bedrock you could only look at 1 to 3 Tc targets and ignore the rest if you knew there to by no big nuggs in the area.

As George has stated these projects seem to go by the way side.

Maybe we are expecting too much as well, when all the time we have a new and innovative tool at our disposal.

I wish I had the mad skills that some of you all have I could temp this on my own (maybe someday) until then I have to wait to get that tool in my hands.

Thanks for all you contribute to all of us .
Be well

[lc516]

This is a nice project , especially for learning and education, but let me make some changes to the
circuit.

[ATTACH]54816[/ATTACH]

That's looks more concisely.
Is it have same sensitivity with original design?

[Qiaozhi]

[QUOTE = Xtrem; 286960]这是一个不错的项目，尤其是对于学习和教育而言，但是让我对
电路进行一些更改。

[ATTACH] 54816 [/ ATTACH] [/ QUOTE]
That's looks more concisely.
Is it have same sensitivity with original design?

In fact the sensitivity is better than the original. The Nano controls the TX oscillator, sample pulses, and generates the audio tone. Since the TX pulse rate is higher (1000pps), and the TX pulse width can be changed from the original (50us) to boost mode (100us), there is an improved detection range.

[MartyJ1963]

Hiya All, I had a few problems trying to upload the 'Arduino PI' INO code to my new Nano's. Firstly, the Nano's I bought are not genuine ones. The onboard chip is the CH340G. I use Windows 7 64-bit. Here is the link for the Nano's I ordered https://www.ebay.co.uk/itm/New-Nano-...r/313074662903. I downloaded a Windows CH340 Driver from this link https://www.arduined.eu/ch340g-conve...iver-download/. I used the normal settings etc to upload the code but with no success. I then changed a few settings and finally got both of my new Non-Genuine Nano's to program correctly. 1. Select 'Tools' in the Arduino Taskbar then 'Board'. Select 'Arduino Nano'. 2. Select 'Tools' then 'Processor' then 'Atmega328P (Old Bootloader). 3. Select 'Tools' then 'Programmer' then 'Arduino as ISP'. These settings for me resulted in success. The link above for the Nano's are pretty cheap too! I just thought I'd provide the steps I used in case anyone else was having trouble programming their clone Nano's. Hope everyone has a successful build with this new exciting project kindly provided 'again' for free by George. Thanks George! Regards, Marty.

[6666]

Thanks Marty, which IDE version are you using ?

[lc516]

I am one that has experimented with digitizing the decay curve. Used the front end of my HammerHead2 and a PIC32 processor. I did an exponential curve fit to obtain a TC. This worked fairly well for well defined non-ferrous targets like coins but odd shaped targets and iron gave odd results, TC could be anything so really did not discriminate ferrous/nonferrous.
I never wrote this up and posted on Geotech but did write up some of the PIC32 code methods used to generate signals.
Once I get some time I would like to revisit this with the VooDoo circuit that has ferrous discrimination.

Maybe,you can add a ADC Pin input the nano,run your code with this circuit.
Just on TP6 point to ADC Pin,than the PI had a new feature.

[MartyJ1963]

Hi Bruce, Do you mean Arduino software? The software I used was Arduino 1.8.13. Is that what you meant? Regards, Marty.

[6666]

Hi Bruce, Do you mean Arduino software? The software I used was Arduino 1.8.13. Is that what you meant? Regards, Marty.

Thanks, yes thats it.

[MartyJ1963]

Just waiting on a few components to start building. They should arrive tomorrow. Regards, Marty