My stm32 powered pi detector

[gtdavid]

Hello All,
I have been floating around the traps for a while and built/modified quite a few detectors.. But my main hobby background has been in microcontrollers.
I know there are quite a few mcu detectors out there but I found my self just wanting more. So I decided to finally do it.
Image..
https://drive.google.com/file/d/1fD-...ew?usp=sharing

Yes, it's SMD..
To use the latest ic you just don't have a choice but at home reflow is not that hard.
The current features are -
- Split rx and tx design
- Dual receive coils (thinking one fast coil one slow coil)
- Integrated full h bridge ( to experiment with reversing the magnetic field on the tx)
- Adjustable boosted tx voltage 20v to 60v
- 1w audio speaker / 3.5 jack
- Wide battery range 9v to 18v
- 4.3-inch LCD with separate controller
- No external pots
- 100mm x 80mm footprint

Software points
- No oscilloscope required
- Adjustable frequency
- Adjustable sample delay
- Adjustable sample width
- Adjustable pulse width

I am looking for some help with improving the rx circuit.
sch link https://drive.google.com/file/d/1my5...ew?usp=sharing
pdf link https://drive.google.com/file/d/1LtS...ew?usp=sharing

I will post the project on GitHub if anyone is interested or wants to help.

[6666]

what type of file is it ?

[gtdavid]

kicad .sch i will post a pdf in a second

[kt315]

what CAD you use?

[gtdavid]

pdf link up now

[gtdavid]

Kicad 5 its free!!

[kt315]

do not start up new project. take QED and start to follow it. https://dfiles.ru/files/xy6p45ov2?redirect
or take QED for some basic and rename it on your one.

[gtdavid]

QED.. there is some good info there but with the features I want the would not be much left of the QED. i will defiantly study the rx circuit though thanks

[kt315]

remember this forum is tightly monitored by minelab trolls and they do not give you to finish the project. thats is why we can only do the simplest schemes but not complicated as QED.
this forum is closed from making of perfect detectors of the modern level.

[waltr]

Sounds good and is right in line with the discussion in the "Why bother" thread in the Off topic sub-forum.

As I stated- most members can do hardware but it is the Software that is difficult and even more difficult to explain how it works.
Which STM32?
Written in C?
Which compiler?

There is much in this forum about RX front ends. Check through Tinker's threads for a start since it seems you probably want a fully-differential RX front end.

[Qiaozhi]

Hello All,
I have been floating around the traps for a while and built/modified quite a few detectors.. But my main hobby background has been in microcontrollers.
I know there are quite a few mcu detectors out there but I found my self just wanting more. So I decided to finally do it.
Image..
https://drive.google.com/file/d/1fD-...ew?usp=sharing

Is that the actual finished PCB, or is it a 3D image generated by KiCad?

[dbanner]

Looks just like the real thing.

[kt315]

Sounds good and is right in line with the discussion in the "Why bother" thread in the Off topic sub-forum.

'why bother' thread has the gerber files shared. does this thread have the gerber files, ASM and HEX code, full Part List, o-scope pics in all control points?

[gtdavid]

Ok.
Why bother well I have always wanted to do it so I am, why has any body done it before.
I can do the software that's not a problem, The code is in C using eclipse ATM.
It's using the stm32f7
And the pic is a 3d image from kicad.
It's 90% there just working over things now before PCB printing.
I am happy to share I was going to use GitHub

[Qiaozhi]

And the pic is a 3d image from kicad.

It's better to load images and stuff directly into the forum (Go Advanced) than to rely on external sites.

I've been looking at KiCad recently, as I wanted to use my Linux laptop for PCB CAD instead of Windows. The Software Manager in Linux Mint only had version 4.[something], so I've downloaded V5.0.0 today. Got to work through the Getting Started Guide yet, as there's a few differences when compared to EasyPC, and the 3D image looks much better.

By the way, the standard answer, when someone asks "Why bother?", is "Because I can".