[x] Welcome at THunting.com!

A fun place to talk about Metal Detecting, Treasure Hunting & Prospecting. Here you can share finds and experience with thousands of members from all over the world

Join us and Register Now - Its FREE & EASY

THunting.com
Treasure Hunting & Metal Detecting Community
   
Advanced Search
*
Welcome, Guest! Please login or register HERE - It is FREE and easy.
Only registered users can post and view images on our message boards.
Did you miss your activation email?

Login with email, password and session length
Or Login Using Social Network Account
News:
Pages:  1 2    Go Down
Print
Share this topic on FacebookShare this topic on Del.icio.usShare this topic on DiggShare this topic on RedditShare this topic on Twitter
Tags:
0 Members and 1 Guest are viewing this topic.
Offline xavier
Moderator
Platin Member
*****

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #10 on: January 30, 2013, 02:15:44 pm »
Go Up Go Down

Hi  Whydoth99

Quite impressive clip you posted there. I must admit that I'm still trying to grasp all the stuff that you spoke about, but I'm getting there

All the best
Xavier   

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg249696.html#msg249696


Xavier


Logged

So many questions so little time

Offline Homefire
Global Moderator
Platin Member
*****

Join Date: Jan, 2009
Thank you662

Activity
0%
Male
United States
Posts: 15906
Referrals: 0

52360.00 Gold
View Inventory

Awards
« Reply #11 on: January 30, 2013, 11:01:55 pm »
Go Up Go Down

LOL!     All just a bunch of jumping numbers to me.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg249736.html#msg249736




Logged
Offline xavier
Moderator
Platin Member
*****

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #12 on: January 31, 2013, 12:51:28 pm »
Go Up Go Down

That's how you can see what is under the coil. Once you know what the numbers are then you can tell the PIC that if the number is = 0000458 it's copper or what ever, you can also increase the sensitivity of the detector by quite a bit. 

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg249784.html#msg249784


Xavier


Logged

So many questions so little time

Offline whydoth99Topic starter
Pull Tab
*

Join Date: Dec, 2012
Thank you0

Activity
0%
Posts: 7
Referrals: 0

45.00 Gold
View Inventory

Awards
« Reply #13 on: February 05, 2013, 04:13:12 pm »
Go Up Go Down

I have been working forward from the "jumping numbers"
On the bench it will now predict whats there and try to tell you how 'deep' it is.

Uses the voltage reading and phase change to identify using stored calibration against different items. Basic natural log linear regression against the 'e' exponential change in values over distance.

Biggest issue is needing a button to set a zero point to then measure against. The zero point can change often and not figured out yet how to dynamically determine the zero point.

Now more than just flashing numbers and no one will convince me a 50cent clad is not a clad quarter closer to the coil :-)

Gene

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg250216.html#msg250216




Logged
Offline xavier
Moderator
Platin Member
*****

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #14 on: February 06, 2013, 11:32:39 am »
Go Up Go Down

Hi Gene

Looks like you're doing good progress. What dsPIC did you use?   

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg250278.html#msg250278


Xavier


Logged

So many questions so little time

Offline whydoth99Topic starter
Pull Tab
*

Join Date: Dec, 2012
Thank you0

Activity
0%
Posts: 7
Referrals: 0

45.00 Gold
View Inventory

Awards
« Reply #15 on: February 19, 2013, 12:21:43 pm »
Go Up Go Down

Sorry for the very tardy response!

Using the 18F2550.

Looking at power consumption the HF itself is about 15ma, the serial display I use is about 15ma and the PIC/opamp and schmidt trigger is about 32ma for a total of around 62ma.

I have had two chances to use it so far, the predictions of object and depth are not great in real life. The readouts of delta phase and delta volts do allow for a quick determination of whether to dig or not but I may have gotten lucky, the HF analog discriminator is quite sensitive and accurate. The unit does have one potentiometer (of two inside the HF unit) that can adjust the discriminator baseline. Anyone with one of these that say it 'loves' iron just needs a tweak of the pot :-)

The pic monitoring does allow me to detect more than the HF circuit itself but PIC ground balance to get the higher sensitivity needs to be performed often as terrain changes.

Gene


Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg251483.html#msg251483




Logged
Offline xavier
Moderator
Platin Member
*****

From a rainy Brussels
Join Date: May, 2009
Thank you166

Activity
0%
Male
Belgium
Posts: 7339
Referrals: 0

32206.00 Gold
View Inventory

Awards
« Reply #16 on: February 19, 2013, 02:22:23 pm »
Go Up Go Down

Hi Gene

18f2550 I got one in my box of PIC's. I think that you may still have a bit of work on your hands but I also think that you are on the right track and damn close to getting it working like it should.

Keep at it mate
Xavier

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,45695.msg251489.html#msg251489


Xavier


Logged

So many questions so little time

Print
Pages:  1 2    Go Up
Jump to:  

Powered by SMF 1.1.19 | SMF © 2005, Simple Machines | Sitemap
Copyright THunting.com