Chipkit uno32 Metal Detector Shield Experiment Project

[hdphilip]

Here's what I've been working on......

A metal detector sheild board for the chipkit uno 32


the chipkit computer board plugs into the bottom of the metal detector "shield board", so with the headers exposed on top, i'll be able to have a display / control board which will mount on top.

the metal detector circuits are based on the QED ideas, which i figured would be a good place to start, Also i included on the board are the following:

a 16 bit differential ADC, idea being it'll help me understand and visualize the balanceing of the ground response vs. the target response.

a 14 bit DAC converter, it feed's the voltage to frequency chip for audio output.

Li-po battery charger

3 axis digitial accelerometer (just for fun ,maybe)

digitial barometer (just for fun)

bluetooth interface

Right now, I'm working on the code to test out all the circuits, the oranqe wire feeds the output of the DAC converter to the ADC, which is working, the TX drive, Snub drive, seem to be working too.



Philip

[hdphilip]

the blue trace in the picture is the sampling window taken after the first stage of the LMC6482. so far so good.

notice the yellow marker on the left side of the screen doesn't line up with the trace.......... my new rigol scope need to go back for warrenty repairs............

[moscadondres]

Good work,i'm looking for your work and i'm interesting for make one with your help,best regards.

[simplejohn]

Hi Philip - how is it going with the code?, did you finish the hardware?

[hdphilip]

simple john,

yes, the hardware is finished, only had 3 issues, but i was able to fix them, right now i'm working on the software to digitize the sample out of the integrating adc driver .

as far as performance goes, when looking at the output of the adc driver with the scope, with just one tx pulse, very impressive!!!!!

Philip

[simplejohn]

Hi Phillip , Sounds good mate, I've got an eagle eye on this Project!

[hdphilip]

a lttle movie of sucess!!!

here's a quick movie of some waveforms:

so the project is coming along

Philip

next, add some sound.....

[greylourie]

Hi Philip

How are your experiments with the sound going ? Have you tried any options, like giving different signals different attributes. I was thinking along the lines of what is done with the Sel1/ Sel2 in the Goldscan.... Just wondering. Watching videos of the Iron Check feature in the new Garrett ATX Pro, .. nice "grunt".

[ronmann]

im wondering if anyone has the pde or the sketch for the chance pi metal detector, all i found is the hex code, but it would be nice to have the sketch to tinker with it and maybe the utft lib, with a touch screen

[Silver Dollar]

Umm this is not the Chance Thread but Chance's software source code was never released.
It was most likely written in Assembler or "C" and so has no sketch or PDE...

[hdphilip]

Ronmann, even though it would be nice to have a utft display, with a touch screen, the timing issues wouldn't be worth it. if you want something to tinker with, start with carl's pi source code, I did that the other day, works pretty well.

greylourie, I got the sound working, I did it pretty much the way bugwhisker's did it as shown in his software, as a matter of fact, I derived most all of my timing from his source code, even the way I set up the comparator In the pic 32.

Philip

[baum7154]

im wondering if anyone has the pde or the sketch for the chance pi metal detector, all i found is the hex code, but it would be nice to have the sketch to tinker with it and maybe the utft lib, with a touch screen

Silver Dollar is your best resource for this kind of info