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16  Forum 2005-2010 (read only) / Interfacing / Re: Have I been hacked? on: January 22, 2010, 09:45:51 am
This is nothing to worry about, as long as you keep your software versions up to date. Basically there are worms that scan as many computers round the net as they can, trying known vulnerabilities to get into systems. It's all done by trial and error, and it's surprising how many computers they can actually get into, as nowhere near as many people apply patches as they should and keep their software up to date.

As a result, any device connected to the net will be scanned on a daily basis by various worms etc, and you can see similar in pretty much any log file of a device left connected to the net for a couple of days. Ip's are scanned in numerical order, they aren't targeting you specifically.

As long as you install security patches / upgrades as they are released you should be pretty well protected (although nothing is 100% secure).
17  Forum 2005-2010 (read only) / Troubleshooting / Re: Single-Sided Arduino Schematic not sized right?? on: May 28, 2010, 05:16:33 am
One of the problems of printing images like this is that a lot of software automatically resizes the image when printing (eg shrink to fit etc), and this doesn't give an exactly accurate size.

If I were you I would use Eagle to print from, as the eagle files are provided. Download the free version of Eagle and load the files, then print from that. Obviously this is still going to cause problems, as your dad will have to install eagle. However, the way round this is to install a printer driver that prints to a PDF. Print from Eagle to a PDF, then send the PDF to your Dad to print (making sure that when printed shrink to fit etc is turned off).

Primo PDF is an excellent little program for printing to PDF. It installs as a printer driver, so you can print from any package as you would normally, except it captures the output as a PDF.

Doing it this way will ensure that it comes out at the exact size it was created at.
18  Forum 2005-2010 (read only) / Troubleshooting / Re: 5v Power Supply using 7805 Voltage Regulator on: November 11, 2009, 08:02:20 pm
Yes, basically the capacitors are used on the power lines to smooth out any electrical noise.

The faster microcontrollers operate, the more prone they are to noise, which can cause random glitches and resets etc, so capacitors are used to filter this out and provide a cleaner supply.
19  Forum 2005-2010 (read only) / Troubleshooting / Re: Sparkfun Ethernet Shield + router problem on: March 23, 2010, 06:35:28 am
The shield won't show up on all routers, depending on the method the router uses to find network devices. A lot of them use UPNP to detect devices, but can't find the shield using it.

When you are connecting the shield to the internet (rather than just using it on the local network), you need to give it the ip address, subnet and gateway (where the gateway is the router ip).

I had the same problem myself, and although I could ping the shield on the network, I couldn't get out to the internet until I provided the gateway. Have a look in the examples, and it shows the format to use for this.
20  Forum 2005-2010 (read only) / Troubleshooting / Re: Input Capture issue with Mega on: February 19, 2010, 09:53:50 am
The thread below may help you, showing what is and isn't available, and also the pin mapping between the chip and arduino pins:
21  Forum 2005-2010 (read only) / Troubleshooting / Re: "Guide" page - USB driver section needs update on: February 05, 2010, 09:16:15 am
It's the VCP (Virtual Com Port) drivers that you need.
22  Forum 2005-2010 (read only) / Troubleshooting / Re: Which port ? on: November 23, 2009, 07:07:11 am
I recently did a similar thing in one of my own programs, I had a list of the serial ports, so the user could pick the correct one.

Details for getting a list of the serial ports are below:
23  Forum 2005-2010 (read only) / Troubleshooting / Re: Thermistor to Arduino... on: November 11, 2009, 06:38:02 pm
As mentioned above, why not go with the Maxim DS18S20. They are extremely accurate, easy to work with using the Arduino, and you can string up to 64 together on the same pair of wires. They are also very cheap.

They can be waterproofed by being sealed into a piece of copper tubing, if they actually have to go into the water.

Have a look at the datasheet at:

If you do a search in google you`ll find a load of example arduino code for reading the temperatures from them.
24  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino 168 or 328? on: October 10, 2009, 05:01:51 pm
As Mike said, the 328 has twice as much memory as the 168.

Apart from that, they are identical, so the same code will run on both without problems. The 168 can be taken off older arduino boards and replaced with a 328 with no other modifications needed, as they are directly compatible.
25  Forum 2005-2010 (read only) / Troubleshooting / Re: LED sensor output zeros on: September 30, 2009, 08:54:07 am
I haven't used any of the above before, but looking at the code, unless you have more than one arduino connected, the line:

arduino = new Arduino(this, Arduino.list()[1], 115200);

Should be:

arduino = new Arduino(this, Arduino.list()[0], 115200);

0 is always the first element in the array, so if there is only one arduino connected then it will appear at position 0 in the array.

Just a guess, but may be the problem...
26  Forum 2005-2010 (read only) / Troubleshooting / Re: Infrared Reciever problem. on: August 26, 2009, 06:24:16 pm
Have a look at Lady Ada's TV B Gone project at:

It uses an AVR chip to mimic a remote control, and in the Design section theres a lot of notes on how remote controls work. Will probably help to decipher what it's sending.
27  Forum 2005-2010 (read only) / Troubleshooting / Re: Infrared Reciever problem. on: August 26, 2009, 09:34:07 am
It looks like that the value on the pin is floating when it's not picking up the IR signal from the remote.

Try tying the pin to ground with a resistor, and that should work better.
28  Forum 2005-2010 (read only) / Development / Re: Picking a ferrite bead for ENC28J60 on: March 24, 2010, 11:29:51 am
With regards to the original query, I don't think the value has to be that precise.

Tuxgraphics say (for their ENC28J60 design):

A 5mm ferrite bead with 5-7 turns of thin wire seems to work well.  
29  Forum 2005-2010 (read only) / Development / Re: Picking a ferrite bead for ENC28J60 on: March 24, 2010, 10:49:26 am
Before you go too far with the ENC28J60, have a look at the Wiznet 5100 chips (that the main arduino ethernet boards use).

They are MUCH easier to work with, as they have the TCP/IP Stack etc built in, and it saves a lot of code on the arduino, which in turn gives you more space for your code.

They aren't expensive, around the same price as the ENC28J60. The only downside is that they are 80 pin, which makes them a bit harder to work with when developing compared to the ENC28J60 DIL package. It's worth the extra hassle though, and they can be controlled using SPI so they only tie up a few of the Arduino's pins.

Have a look at the datasheet at:
30  Forum 2005-2010 (read only) / Development / Re: Ethernet shield available pins on: March 23, 2010, 08:33:27 am
But I can see some other pins marked with an asterisk (pins 3,5,6) and that looks suspicious.. are they still available as general i/o?

The pins marked with an asterisk have PWM available on them. They are available for normal use as general i/o
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