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Offline gtdavidTopic starter
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« on: April 11, 2015, 08:08:09 am »
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Hello To All.
I am new to this forum and would like to say what a great forum it is.
I have been working on a few experiments of combining a traditional pi circuit with a powerful microcontroller.
All work will be open source with code, schematics and board files available to all.
What I am looking for is some suggestions on what pi circuit people would suggest as a starting base and what features would you like to be included..
As it is my idea's are as follows.

stm32f4 microcontroller to be used clock at 180Mhz.
microcontroller to be onbaord with pi circuitry.
4 layer pcb(a must with the microcontroller).
Majority of the circuit to be smd to save space.

All settings to be set via the microcontroller with digital pots.
Ability to save/load settings on the fly.
Have pi circuitry handle the bulk of the work and have the ability to annalise a target via the microcontroller.
Onboard inductance meter so we have the microcontroller set the pi to work with any coil(within reason).
Options to set the pi circuit to a small gold machine or normal.
Ability to set your own operating frequency or use a default.
Frequency to be handeled by microcontroller.
I did think about adding a gps module but I am not shore about it been worth the extra battery drain.
Chest mount control box.

My past experiments have led me to believe that processing and displaying such high speed signals is verry process hungry so signal processing should be only done once target is found.
I have the microcontroller and I have a limited knowledge with kicad software.
I have begun to design the GUI and will post a sample very soon..
Well that's what I have so far..
Thank you.


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« Last Edit: April 11, 2015, 08:09:06 am by gtdavid »
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« Reply #1 on: April 11, 2015, 08:22:13 am »
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Hi Gtdavid

You will not have any of us making your detector because non of us can make a 4 layer board then there are the smd components, they are hard to get in small quantities and non of our members would be able to use them. PI detector run on a slow frequency unlike a VLF detector, it's the only way to get the detection depth (power, coil decay, delay, sample time) Adding a GPS to the detector is a good idea but a data lodger using a SD card would be good. You are going to have to rethink your design I'm afraid.   

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« Reply #2 on: April 11, 2015, 08:53:02 am »
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I was thinking of space saving with the smd but I could go threw hole just as easy and the majority of my protype components are threw hole.
As far as the 4 layer board go's I don't really have a choice with this type of controller but having them printed is not that expensive as long as I can keep the board size in check.
Thank you for your reply Smiley

Posted on: April 11, 2015, 08:27:10 am
And in the interest of others the first prototype could use the stm32f4 discovery board that has pin header's so the PCB board can just piggyback off it.
It also has the USB programmer on board.

Posted on: April 11, 2015, 08:30:45 am
Here is a quick sample of the GUI.
Currently I am using the stm32f4 discovery board.
Running a ADC connected to a pot for testing.
You cannot hear it in the video but I also have a PWM driving a speaker tone directly attached to the ADC signal.

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YouTube Video


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« Last Edit: April 11, 2015, 09:11:13 am by gtdavid »
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« Reply #3 on: April 11, 2015, 09:14:31 am »
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  Being Old School with bad eyes I cant do SMT.   

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« Reply #4 on: April 11, 2015, 09:27:41 am »
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Ok I will drop the smd side of things.
Would a double sided board with threw hole components be ok?

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« Reply #5 on: April 11, 2015, 11:33:56 am »
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That would be OK for some of us, you need to remember that a lot of the members do not have much experience in electronics so perhaps you could make a simplified version of your design. We only have a few members that could do a double sided board also myself and Carl have been working on a prototype digital PI detector, dual tone with metal recognition (ferrous and non ferrous) Carl will be on a bit later on and I'm sure that the two of you will have much to talk about.  At the moment all my projects are on standby due to a health problems so no more development on the PI for me for now.

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« Reply #6 on: April 11, 2015, 04:27:46 pm »
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I did see your PIC PI very nice work !
What pi circuit would you suggest as a base for me. I have been looking at the sd2000.

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« Reply #7 on: April 12, 2015, 11:44:40 am »
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For your research you need to use the simplest of designs that you can get, you do not need for your detector to be able to detect a coin at 300mm, what you need is for your detector to detect the different type of metals even if the detection is only 30mm that is OK. once you have a simple working detector you can now proceed to making it more complex because you know that your design is good (in the beginning you do not want to have to spend time working out things that are of no help to your project) all you need is a pules at a predetermined pulse rate lets say that you decide on 120 PPS now you need a receiver you also need to decide if you are going to use one coil or two (for DSP two coils are better) you then need a simple receiver (I will have a look to see if I can find you one) the rest will depend on how you program your PIC (I like the 16F877a)

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« Reply #8 on: April 12, 2015, 07:30:13 pm »
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That would be great thank you.
I will also look into the two coil option also .

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« Reply #9 on: April 12, 2015, 09:49:10 pm »
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Keep us posted on you improvements. I for one am always interested in new designs and ideas. 

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