Arduino Nano PI Main Discussion

[Qiaozhi]

Hello everybody. I would like to built this metal detector, but I can not probably find list of all parts. I wrote down all the parts from the pdf schematic file, and I found out Im missing U4 and U5. Than I was checking all the rezistors, but I do not know which of them are trimmers. Can anybody help me please? Im attaching the list of parts I found on the schematic file. Thank you

The Components Parts List is in Appendix A of the book.

[tomas.turcar]

Hello everybody. I would like to built this metal detector, but I can not probably find list of all parts. I wrote down all the parts from the pdf schematic file, and I found out Im missing U4 and U5. Than I was checking all the rezistors, but I do not know which of them are trimmers. Can anybody help me please? Im attaching the list of parts I found on the schematic file. Thank you

[GeoMax]

Hello Olabec,

Why do you need an SMD version of the project? It would do the same thing, but it's more difficult to solder.

[Olabec]

Before I reinvent the wheel, has anyone done a surface mount component version of this project? Thanks

[Qiaozhi]

Hi

I'm a bit stuck again. Before beginning construction the coil seemed fine, about 20cm strongish signal for a £1 coin but now I've mostly put it together this has fallen to closer to 2cm!

I'm really confused as the voltages seem OK. Although I can't seem to change the flyback voltage from the potentiometer on the pcb but its showing at -182v. The coil itself has an inductance of 0.32mh so that seems fine. Wave looks normal on TP6 it just doesn't seem to be anywhere near as sensitive as it was before I started putting it together.

Any suggestions would be much appreciated!


Thanks

You will need to use an oscilloscope to debug the problem.
The only adjustable pots are the sample delay, null offset for the preamp, and the audio threshold. None of these have any effect on the flyback voltage.

[Lukelearning]

Hi

I'm a bit stuck again. Before beginning construction the coil seemed fine, about 20cm strongish signal for a £1 coin but now I've mostly put it together this has fallen to closer to 2cm!

I'm really confused as the voltages seem OK. Although I can't seem to change the flyback voltage from the potentiometer on the pcb but its showing at -182v. The coil itself has an inductance of 0.32mh so that seems fine. Wave looks normal on TP6 it just doesn't seem to be anywhere near as sensitive as it was before I started putting it together.

Any suggestions would be much appreciated!


Thanks

[Carl-NC]

Is it possible to use an IRF840 mosfet without too much changes? What would be the benefits or drawbacks of it? Thanks.

That would require significant changes, especially to the power supply domains. Best to stick with PMOS.

[cristiano.sar]

Is it possible to use an IRF840 mosfet without too much changes? What would be the benefits or drawbacks of it? Thanks.

[Qiaozhi]

Can any one have the source cod file for for this?

It's here -> Arduino Nano Pulse Induction Metal Detector Project - Published March 2021

[Prince Zhakata]

Can any one have the source cod file for for this?

[Qiaozhi]

can i use with larger coil < 50 cm
For river floodplains and lands

You can use it with any size coil.

[Tanu]

Thanks for the update.
Hope the rest of the build goes OK.

can i use with larger coil < 50 cm
For river floodplains and lands

[Qiaozhi]

Just a small update - it was the cheap clones. Using a legitimate nano solved my issues

if its useful to anyone I got the first 2 from Tayda (1 worked fine for a while) the second 2 I got from kunkune that started smoking straight away

Thanks for the update.
Hope the rest of the build goes OK.

[Lukelearning]

That input voltage should be perfectly OK for the Arduino Nano. The User Manual says 12V, but that's the nominal voltage.
Here's the User Manual ->https://components101.com/microcontrollers/arduino-nano

There's a schematic in the manual which shows that the voltage regulator is an UA78M05, which has an input voltage range of 7V to 25V.
https://www.alldatasheet.com/datashe...I/UA78M05.html

I've powered the Arduino Nano with a lithium battery pack of several occasions with no magic smoke being released.
I suspect you have some poor quality / dodgy devices.

Just a small update - it was the cheap clones. Using a legitimate nano solved my issues

if its useful to anyone I got the first 2 from Tayda (1 worked fine for a while) the second 2 I got from kunkune that started smoking straight away

[Qiaozhi]

I did that but it started smoking straight away!

I have 3s Li-ion NCR18650B for the power. The voltage coming from them is 12.34V do you think this is too much for the nano to handle?

Like I said it was working OK before but maybe I've charged them and that extra voltage has pushed it over the edge?

That input voltage should be perfectly OK for the Arduino Nano. The User Manual says 12V, but that's the nominal voltage.
Here's the User Manual ->https://components101.com/microcontrollers/arduino-nano

There's a schematic in the manual which shows that the voltage regulator is an UA78M05, which has an input voltage range of 7V to 25V.
https://www.alldatasheet.com/datashe...I/UA78M05.html

I've powered the Arduino Nano with a lithium battery pack of several occasions with no magic smoke being released.
I suspect you have some poor quality / dodgy devices.