Arduino Nano VLF Metal Detector Project - Main Discussion

[ivconic]

Very interesting, neat, likeable!
I am interested in one thing; why did you decide to generate the sine signal from the MCU directly?
In this way, you took even 8 pins!
Among them is a UART port as well as some very useful PWM pins.
Some are directly tied and controlled by timers.
Too many resources wasted. Hence the two Nanos.
I'm not saying it's bad, it can be done that way too, why not.
I'm just wondering why you didn't just use one PWM pin and still shape it with a discrete solution out of MCU.
Even more; wouldn't it be interesting to drive the TX directly with a square signal?
So much for now, I didn't get to analyze everything.
But you certainly gave a very good starting point for upgrades!
Great idea!

[ivconic]

[GeoMax]

Hi Qiaozhi,
nice project... just purchased a copy of the book on Amazon....

[ArchibaldSTM]

Interesting.. We will follow the development of the project. Thank you!

[Olly]

Excellent stuff George, my book is on order and eagerly awaited.

[Qiaozhi]

This is the main discussion area for the project.

The introduction is here -> Arduino Nano VLF Metal Detector Project - Published January 2024