My stm32 powered pi detector

[eclipse]

If you are heading for a test/dev in-lab/in-home project go with that.
But if you like to get it more as a working on the field prototype stay away from pre-built modules.

Trust me everything on a single custom board is way much closer to prototype that can actually WORK on the field
and not stay on the desktop as a modern decoration.

And meanwhile having a display is a drawback. Extra parts. Extra work. No performance increase whatsoever.

If you have knowledge in PIC32s I can share some code that may help a bit if you have worked with those.

[gtdavid]

I was thinking that but if I do something like this..


100mm x 100mm board.
I want to enable more people to build it so I have to compromise somewhere.
it should be portable with nylon bolts holding the sandwich together.
The reason I wanted an LCD is because I wanted all variables changeable in the field but did not want any wires or pots.
Using the internal LCD interface on the stm would mean only buying a $10 display.

And yes I would love to have a look at your code..

[eclipse]

Oled screens are pretty good and cheap nowdays ... search for SSD1306 in aliexpress.. 2.42" go for ~30$
Pretty low power consumption and wide viewing angles.

[Hyena]

Oled screens are pretty good and cheap nowdays ... search for SSD1306 in aliexpress.. 2.42" go for ~30$
Pretty low power consumption and wide viewing angles.

I dare to disagree with this They eat 50-60mA when they show 1 line and 3 bigger digits. Depend also on contrast, which you need to set up to max in strong daylight. With all pixels on it sucks 200mA !!! Which can not be considered as low...

[eclipse]

Yup 50-60mA is just exactly what numbers I had in mind and I call these low... anyways I see the display as a drawback. No useful information will come up on it at all.
For better consumption - E-Ink: https://www.embeddedartists.com/prod..._27_epaper.php

[gtdavid]

I could... Display to a android phone it's my go-to move when settings or information is only needed every so often and it's cheap
I am thinking of just having the LCD sleep untill you tap the screen

[gtdavid]

I do have an esp32 here maybe paired with the external adc idea one could have a low power MCU pi with Bluetooth and wifi. Dam it why did I not think of that

[eclipse]

There you go, some time & cash saved and it's good UI.

[sled]

WM8738 and WM8501 are ultimate choice.

CS4272 is the ultimate choice, power hungy though. Checkout the SuperAudioBoard: https://github.com/whollender/SuperAudioBoard especially the design guide here: https://github.com/whollender/SuperA...esignGuide.pdf 114dB dynamic range, flat frequency response up to 20kHz.

AKM also has really nice codecs (https://www.akm.com/akm/en/product/detail/0020/) especially their "Premium ADCs" (https://www.akm.com/akm/en/product/detail/0055/) with sampling rates up to 768kHz.

[Mdtoday]

Hi gtdavid

As with most projects presented on this site, there are many people willing to help with ideas and research, even sample code.
That is the nature of this site and is a great thing
You may end up with something that will be completely different than what you first invisioned which is a good thing and a bad thing.
good because you take on board the experience of others, bad because you may loose the new things you want to try by trying to please everyone, it is a hard road to travel.
The forum is loaded with front end designs some standalone, from JLKing, Moodz, Tinker to name a few.
Moodz has an android app and MagPi. JL has a frontend with ADC, essentially, one could choose the building blocks and make a PI that way, so fir experimenters, there has been plenty presented for everyone to see and build.
The problem fir most folk, it seems, is the SMD parts but it has been that way for years and really, there are plenty of designs based on TH parts that can be built.

For a design to suffer because of this, to me, is unthinkable but then on the other side, I understand the TH argument.

Like has been mentioned, developement boards plugged onto a motherboard are great for experimenting to a point, then you still gotta make it useable in the field. If that is your main intention, to have a usable detector, then I would opt fir your original plan.

just my 2 cents worth.

btw, I am 20 mins from goldfield and about 40 mins from beach...are you in Australia?


cheers

Mdtoday

[Mdtoday]

Hi gtdavid,

Were you thinking of supplying loaded boards or just artwork etc.

Was just wondering, of course there are upsides and downsides to this too but someone is gonna ask so I thought I would

[gtdavid]

Latrobe valley Vic mate..
Your spot on with the pleasing everyone comment but a lot of good has come of it yes the design is changing but so many valid points I just did not think of and am happy to fix, the general design still remains.
Costs are down, size is down.
I am proceeding with smd but will port to a modular design also.
I have not thought about selling boards but it's a defendant possibility I will be ordering stencils with my PCBs so it would make sense to send boards out with components attached.
There will also be 3d printer friendly enclosures to come.
Thanks for the front end leads..

[eclipse]

For RX if you have time as waltr said few posts back you can check out Tinkerer IB thread.
Ideas are IB coil, center tap, energy return instead of wasting it, some discrimination capabilities, ground ballance. The negative voltage is synced with TX so the supply is low noise. Sampling during TX on time.

[ivconic]

CS4272 is the ultimate choice, power hungy though. Checkout the SuperAudioBoard: https://github.com/whollender/SuperAudioBoard especially the design guide here: https://github.com/whollender/SuperA...esignGuide.pdf 114dB dynamic range, flat frequency response up to 20kHz.
AKM also has really nice codecs (https://www.akm.com/akm/en/product/detail/0020/) especially their "Premium ADCs" (https://www.akm.com/akm/en/product/detail/0055/) with sampling rates up to 768kHz.

Yes that's true, thanks for the info and links!
Indeed it beats my choice in performances.


Design guide is carrying lot of interesting things!
Thanks again Sled!

[waltr]

Latrobe valley Vic mate..
Your spot on with the pleasing everyone comment but a lot of good has come of it yes the design is changing but so many valid points I just did not think of and am happy to fix, the general design still remains.
Costs are down, size is down.
I am proceeding with smd but will port to a modular design also.
I have not thought about selling boards but it's a defendant possibility I will be ordering stencils with my PCBs so it would make sense to send boards out with components attached.
There will also be 3d printer friendly enclosures to come.
Thanks for the front end leads..

Having PCBs available to buy is a good thing since all board houses have a minimum of 5 PCBs.
Have most of the SMT parts soldered on also good. I can solder many SMT parts but not the higher density ones or the ones with pads on the bottom. Can't even do some of these where I work with our hot air tools.