Arduino Nano PI Main Discussion

[6666]

Unfortunately that means you have to pay more money for the genuine version.

I will try programming the Nano from a Windows machine a bit later, and let you know whether there were any issues.

Found some info online in tools/ processor ,Try using "328 old boot loader" seems to work with nano

My IDE used to work with my nano which has 340 chip by default
but after IDE and board library upgrades this setting now has to be selected manually to work with older nano's.
at least it now works with my nano.

[6666]

Well my old nano is working with "old boot loader" ok now,
cannot get the new nano to work at all with the IDE, might try and burn the hex file.
Amazon say my book should be here on 8th April, we will see.

[godigit1]

Hi everyone ,
Please help me to look over this schematic I think I'm ready to start tweaking the Pwb but really need some help looking things over to double check me.
I made some tweaks to the schematic I added the mur diode a dual op amp, DD coil connections, Swapped out the 4066 chopper for a J113 added the two sample switches and a gain pot at U52 and Data pin for a Sd card.

I used jumpers for the sample switches so they can be isolated and if the dual amp and the J113 work properly it should work fine with no software changes. But now a rudimentary GB can be experimented with.



I went with the Mpp op amp and eliminated the offset null.
Can I Get away with that or should I add it back ?

I was thinking just go back to single amp and do a double one dead bug style if we really wanted it .

I'm not sure how the audio chopper really works its not been on the designs I've been trying to learn from so its the biggest question for me if I connected the J113 correctly?
once the board is up and running i can study what its doing..

I'm calling the board Arduino pi pro Q if that's Ok with you Qiaozhi, thought Pro Q sounded cool.

Pro Q Arduino_PI.zip

Any help or suggestions would be a great help .

Thanks All

[daluka]

Hi everyone ,
Please help me to look over this schematic

[MartinB]

Just down loaded DipTrace. What a fantastic freeware programme. Thanks George.
Ordered book last night and it arrives tomorrow.

[Qiaozhi]

As daluka pointed out, there are some ERC errors in the schematic.

I've corrected these in the attached file.
The first two are associated with C4, where you have the wire running through the symbol resulting in R34 being connected to GND instead of U3.
Errors 3, 5, 6, 7, and 9 are all associated with R3 having an unconnected pin.
Error 4 is an unconnected pin on R6.
Finally, R8 is caused by a net with a single pin. This is because the -5V symbol should actually be V-.

By the way, I never use 4-way crossovers, as it makes it difficult to see whether this is an intended connection or if it is simply two perpendicular wires crossing each other. Although there is a tie dot, you have to zoom in to see it. I always stagger the connections. For example, have a look at the original Arduino PI schematic at the base of Q5.

I'll have a look tomorrow at the actual design.

[6666]

The non recognition of the clone board is interesting. I was fortunate enough to have mine recognized as a Nano, at least one out of four that I purchased. I shall solder up the other 3 and try them.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

surfdetector Have you tried the other 3 nano's yet ? what version of the IDE do you have ? thanks.

[surfdetector]

surfdetector Have you tried the other 3 nano's yet ? what version of the IDE do you have ? thanks.

Hi 6666,
I tried one more of my batch and it worked well, I was going to do all 3 but I got side tracked building an LED clock kit. I am using version 1.8.12 of the IDE

[Qiaozhi]

godigit1 - I've examined the design, and here are my findings:

There were a few ERC errors that I fixed in a previous post.
Some resistors were missing their values and PCB footprints, Also, the Gain, TX, and RX connectors did not have a PCB footprint. These have now been corrected.

In the Arduino Nano PI the preamp is in a non-inverting configuration. Consequently I've changed your dual-stage preamp to also be non-inverting. I'm not sure whether you can get away without having the null offset though.

What do you plan to do with the SD card, as I'm pretty sure it will need more than one connection? Even so, the Nano is programmed via the USB port, so I don't know how that would even work.

[MartinB]

The non recognition of the clone board is interesting. I was fortunate enough to have mine recognized as a Nano, at least one out of four that I purchased. I shall solder up the other 3 and try them.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Try this UK company. I find them good and reliable. Arduino compatible Nano with CH340 USB IC (hobbycomponents.com)

[Qiaozhi]

Try this UK company. I find them good and reliable. Arduino compatible Nano with CH340 USB IC (hobbycomponents.com)

Lots of useful parts, and at an inexpensive price.
I've saved that URL for future reference.

[godigit1]

godigit1 - I've examined the design, and here are my findings:

There were a few ERC errors that I fixed in a previous post.
Some resistors were missing their values and PCB footprints, Also, the Gain, TX, and RX connectors did not have a PCB footprint. These have now been corrected.

In the Arduino Nano PI the preamp is in a non-inverting configuration. Consequently I've changed your dual-stage preamp to also be non-inverting. I'm not sure whether you can get away without having the null offset though.

What do you plan to do with the SD card, as I'm pretty sure it will need more than one connection? Even so, the Nano is programmed via the USB port, so I don't know how that would even work.

Thank you for fixing the schematic and thank you as well deluka for helping.

I can see I need to add some libraries to my Dip trace.
On the V- on my version of dip I cannot find that actual symbol in the net ports.
If I use the ref designator and change it does it automatically add it to the net port?
I've been doing it wrong for a while now and just fixing the Pcb.

As you can tell I'm no engineer and still trying to figure it all out. I appreciate you double checking me and wow fixing it for me wasnt expected but thank you so much your awesome.

The Sd card module connects to the ICSP connector and the D4 data line so we can just pretty much plug it in.
I've found the software for it but will need to write a code to boot the Nano from the Sd card.

My thought behind the SD card is being able to load different perimeters in the field.
For experimentation with GB timings as well as adjusting the detector to different ground or type of hunting you intend to do.
(mainly Ground balance testing)

We could have different cards with basically a whole detector change being possible Ie going from a 1000, 100 us on time first sample at 15 us for beach and swapping cards to say 2000 pps 50 us on time and under 10 us sampling if the coil and op amp can support it.
I know your covering good ground with the boost and sample delay and maybe I'm overthinking it a bit
I think with a proper coil maybe in the higher 300 us range might be a good balance for this kind of set up.

Ill go ahead and add the offset null Just in case its needed. Ill post the pcb here for anyone who might be interested in it when
its done. It should work without any extra code as is just have to short out U3 and U4.

Thanks again for your help and everything you do for all of us.

[toolnuts]

Hi George,

I hope the quality of printing is better on this new book, than on the VooDoo book.

What changes should be made on this design to make it good at hunting gold?

Thanks Qiaozhi,

Paul

[surfdetector]

I hope the quality of printing is better on this new book, than on the VooDoo book.

What changes should be made on this design to make it good at hunting gold?

The new book is much better from the standpoint of the included diagrams which are well-sized.

What form of gold are you searching for, nuggets(prospecting) or jewelry at the beach? As stated the design is essentially that of a SurfPI.

[Qiaozhi]

What changes should be made on this design to make it good at hunting gold?

godigit1 has started working on a modified version of the Arduino Nano PI detector to add ground balance. Have a look at his posts in this thread,