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1  Using Arduino / Project Guidance / Re: Arduino metal detector? on: August 12, 2013, 01:40:21 am
Thanks for sharing! What kind of distances can you detect in air? Is there a possibility to discriminate aluminum foil?

I am working on a pulse-induction type detector with arduino, but it's far from ready.

Regards,
Joop
2  International / Nederlands / Re: Vertaling van Arduino IDE in het Nederlands on: March 31, 2012, 12:38:29 am
In principe zou de GUI zo moeten zijn geprogrammeerd dat de vertaalde tekst altijd past. Als er meer tekst is als in het engels moet de venster- of labelgrootte zich automatisch aanpassen.
3  Using Arduino / Displays / Re: 16x2 LCD Module on: December 15, 2011, 09:46:30 am
check out the LiquidCrystal pages.

Regards,
Joop
4  Using Arduino / Project Guidance / Re: Arduino metal detector? on: November 23, 2011, 09:40:53 am
yeah, but digging for rusted nails isn't fun when you want to find a nice old coin.
5  Using Arduino / Project Guidance / Re: Arduino metal detector? on: November 23, 2011, 02:34:14 am
The stuart detectors won't discriminate between different metals. I have built the first version a while back. The Chance detector uses a ATMega8 to investigate the decaying coil voltage. From this we can deduct what type of metal is under the coil. You don't want to dig for iron!
6  Using Arduino / Project Guidance / Re: Arduino metal detector? on: November 20, 2011, 05:23:27 am
Thanks for sharing, I have also built the LC meter. It works very well.

On the howstuffworks website there is a good explanation of pulse induction detectors. We need to look at the decay of the coils pulse. This will indicate what kind of metal is buried.
7  Using Arduino / Project Guidance / Re: Arduino metal detector? on: November 16, 2011, 02:15:18 pm
Hello myfaithnka,

I think it can be much simpler than this. You can use a digital output to create a pulse. The pulse will drive a high power transistor or fet which is connected to the coil. This transistor is powered from some external power source because we need a strong pulse. After the pulse is switched off, we wait a while and amplify the resulting signal with an opamp. This signal is digitized and connected to a digital input.

I came across the chance metal detector, it is a russian design and uses an ATMEGA8. Circuit diagram attached.
8  Community / Website and Forum / Re: Add chat server on the website :D Everyone wants that on: August 25, 2011, 06:03:40 am
Why not creat an #arduino channel on one of the available IRC servers?
9  Using Arduino / General Electronics / Re: driving an IRF630 from Arduino digital output pin on: August 17, 2011, 05:07:58 am
It won't matter much.

You say 1 Amp is not a heavy load, personally I would start worrying if the load is close to the arduino board. If not, then you could be safe.  smiley-wink
10  Using Arduino / General Electronics / Re: driving an IRF630 from Arduino digital output pin on: August 17, 2011, 04:45:50 am
If you will be driving high currents with your IRF630, I would recommend using a buffer between the arduino and the powerfet. Otherwise the current spikes will introduce problems at the arduino site.
11  Development / Other Hardware Development / Re: myDuino (my first PCB) on: August 16, 2011, 04:21:55 am
@Chagrin:  smiley-cool
12  Development / Other Hardware Development / Re: myDuino (my first PCB) on: August 15, 2011, 07:28:18 am
I would recommend placing the decoupling capacitor close to the ATMEGA's Vcc and ground. Maybe you can create some space between the crystal and D4.
13  Using Arduino / Programming Questions / Re: Time Library Question on: August 10, 2011, 02:08:16 am
If you really need accurate time the most common way is to use some external board with a real time clock and then set and read it from your arduino. Most of them have a DS1307 chip. There are plenty if examples on the web.
14  Using Arduino / Programming Questions / Re: Date and time calculations on: August 10, 2011, 01:24:45 am
Have a look at the Arduino Time Library. It may have what you need.
15  Using Arduino / Project Guidance / Re: first project - Density Altitude on: July 22, 2011, 12:55:39 am
Go throught the Arduino shield list and search for available shields. It's the easiest way to get started.
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