[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
2
News:
Pages:  1 2 3 4 5 6 7 8 9 10   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 TeemoTopic starter
Copper Member
*

Join Date: Dec, 2012
Thank you15

Activity
0%

Estonia
Posts: 29
Referrals: 0

155.00 Gold
View Inventory

WWW Awards

Self design PO detector
« Reply #20 on: December 17, 2012, 03:57:14 am »
Go Up Go Down
Hi
My web server was down some hours last night.
So I post schematic, hex file, and parts list here also.
Parts list is new, not on my site yet, I will add it to my website too.


Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238881.html#msg238881


There are 3 attachment(s) in this post which you can not view or download

Please register for viewing them.

PO_metal_detector_partslist.pdf
metal_detector_circuit.jpg
metaldetector_hex.zip

Logged
Offline johnandles
Pull Tab
*

Join Date: Dec, 2009
Thank you0

Activity
0%

Australia
Posts: 6
Referrals: 0

30.00 Gold
View Inventory

Awards
« Reply #21 on: December 17, 2012, 05:24:50 am »
Go Up Go Down
Thank you Teemo, for your hex. Wink
What do you use for search coil dampening?
What timing schedule, sample etc ?
can we modify the source code to suit our needs?
So many questions Cheesy
Regards
john

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238882.html#msg238882

Logged
Offline TeemoTopic starter
Copper Member
*

Join Date: Dec, 2012
Thank you15

Activity
0%

Estonia
Posts: 29
Referrals: 0

155.00 Gold
View Inventory

WWW Awards

Self design PO detector
« Reply #22 on: December 17, 2012, 05:48:58 am »
Go Up Go Down
Hi John.
My circuit is not dumped. Instead it is resonant circuit L1,C1.
Coil driving is 140 microsecond current pulse after every 2milliseconds.
You can't modify the source code now, because I havn't released it yet. Also there is no point to begin debugging the hex file, because it would be waste of time when I publish the original code later.

With best wishes,
Teemo

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238883.html#msg238883

Logged
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 #23 on: December 17, 2012, 01:32:08 pm »
Go Up Go Down
Ok, I went to your site and had a read.

I'm a bit Perplexed on how it works.

Can you please explain to me how it get the target response?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238905.html#msg238905

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 #24 on: December 17, 2012, 02:09:53 pm »
Go Up Go Down
Quote:Posted by homefire
Can you please explain to me how it get the target response?

He is using the PIC instead of components like you would be used to, see the code inside the PIC replaces all them external components well most of them 

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238911.html#msg238911


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 #25 on: December 17, 2012, 02:47:42 pm »
Go Up Go Down
So it's still in the Eddy Current and Time Domain responce?

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238923.html#msg238923

Logged
Offline GoldDigger1950
The Old Man and the Soil
Global Moderator
Platin Member
*****

Just call me GD.
The Old Man and the Soil
Join Date: Jun, 2009
Thank you225

Activity
0%
Male
United States
Posts: 11219
Referrals: 12

47848.00 Gold
View Inventory

Awards

Garrett Groundhog ADS, Garrett Sea Hunter, Bounty Hunter Tracker IV, Bounty Hunter Pioneer 505,Minelab Eldorado Mk II, Tesoro Compadre, Tesoro Tiger Shark & A Few Home Brew Detectors
« Reply #26 on: December 17, 2012, 02:54:45 pm »
Go Up Go Down
Quote:Posted by homefire
So it's still in the Eddy Current and Time Domain responce?

The coil gets switched on, a TX pulse goes out, it gets switched off, there is a quiescent time and the RX is then sensed to determine if there is a target response or not. It's all done by one teeny, tiny little chip and one MOSFET.

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238927.html#msg238927

Logged
It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
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 #27 on: December 17, 2012, 03:02:12 pm »
Go Up Go Down
Quote:Posted by homefire
So it's still in the Eddy Current and Time Domain responce?

OK well this was the response that I had for you but I see that my mate GD beat me to it LOL but here it is any way.

Well yes all the timing is done within the PIC with code so for example if you want an on time of 100ms then a delay of 10ms and an analysis time of 30ms you would simply tell the PIC to turn on port A1 for 100ms then tun port A1 off and turn port A2 on for 30ms 10ms after after port A1 was turned off. It is actually as simple as that and you also have the possibility to change all your timing with out even having to open your detector COOL don't you think? this is what they are giving you on them fancy detectors where you have all them settings, most of it works with volts or PWM and probably there are other ways but I'll leave that to GD as he is by far more qualified than me in the subject.  

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238932.html#msg238932


Xavier

Logged
So many questions so little time
Offline TeemoTopic starter
Copper Member
*

Join Date: Dec, 2012
Thank you15

Activity
0%

Estonia
Posts: 29
Referrals: 0

155.00 Gold
View Inventory

WWW Awards

Self design PO detector
« Reply #28 on: December 17, 2012, 04:41:25 pm »
Go Up Go Down
Hi all.
Please do not get too exited about it. It is still more like Poor mans detector and educational project. Can't really compare to the fancy detectors :Smiley. I now tested, that it can detect 10cent euro coin at 5cm in air. This is my work hosrse, that is built for detecting nails in logs.


Posted on: December 17, 2012, 03:57:07 PM
Picture of my circuit board:

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238943.html#msg238943


There are 1 attachment(s) in this post which you can not view or download

Please register for viewing them.

Metal_detector_board_1024.jpg

Logged
Offline only_25
Copper Member
*

Join Date: Dec, 2012
Thank you0

Activity
0%

Zimbabwe
Posts: 25
Referrals: 0

125.00 Gold
View Inventory

Awards
« Reply #29 on: December 17, 2012, 06:15:22 pm »
Go Up Go Down
the board would fit perfectly for a pinpointer!

Linkback:

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

http://www.thunting.com/smf/index.php/topic,38721.msg238956.html#msg238956

Logged
Print
Pages:  1 2 3 4 5 6 7 8 9 10   Go Up
Jump to:  

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