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16  Using Arduino / Programming Questions / Re: Coin acceptor+LCD1602+SD card module on: July 02, 2013, 07:44:23 am
There's no need to save anything to flash or EEPROM unless the value has changed. You're only shortening the life of your storage device by writing to it too often.

There's a standard EEPROM library included in the Arduino package which has functions to write a byte to an address in EEPROM.
The reference is here and there are examples sketches included in the Arduino IDE.

You can also check this library which makes it easier to write more than a single byte

17  Using Arduino / Programming Questions / Re: Coin acceptor+LCD1602+SD card module on: July 02, 2013, 07:06:12 am
I want to add a sd function so the piggy bank knows how much money there is at all time (in case of powering off).

Sounds like a perfect task for the built-in EEPROM.
18  Community / Bar Sport / Re: Mutated Fish (Perch)?! on: July 02, 2013, 03:34:57 am
Interesting. Could it be a variant of one of these?

The guy in reply #19 says he has caught partly blue perch before.
19  Using Arduino / Project Guidance / Re: How to update database on wamp server using arduino ? on: June 27, 2013, 04:09:06 pm

You got responses in this thread
20  International / Scandinavia / Re: Lcd på arduino sensor shield 5,0 on: June 27, 2013, 03:39:44 pm
Det stämmer bra det DKMVang säger.
Det är en vanlig HD44780 display. Det är nog den typ av display som används mest ihop med Arduino och det finns mängder av guider och exempel.
De röda och svarta kablarna är till backlight. Max 5V vill den ha till backlight och den drar en hel del ström så mata inte belysningen direkt från en Arduino output. Vill du kunna styra belysningen via en output pin behöver du koppla den genom en transistor.

Du har hittat en mycket bra komponent att leka med om man är nybörjare.
21  Using Arduino / Project Guidance / Re: 16mhz @ 3.3v on: June 19, 2013, 02:19:11 pm
I believe the 328 spec. says voltage should be higher at 16 Mhz, but I have run a number of samples of  our Robo1 board  with the onboard 3.3V option for a couple of days without problems.. 

The spec says it will need about 3.8V @ 16MHz but it will probably run fine in at lower voltages in many cases.
The number in the datasheet is most likely based on what's needed to guarantee that all functions will work reliably over time in some worst case scenario.
When you work outside specification you may loose precision or stability but you can also be just fine depending on the circustances.
Only way to find out is by testing.
22  Community / Website and Forum / Re: Problems with accessing forum on: June 18, 2013, 03:53:02 pm
Is Chrome better?

For my personal use it is.
23  International / Scandinavia / Re: Shipping/Customs to Denmark / Scandinavia on: June 18, 2013, 02:57:53 pm
I don't think Danish Customs pay much attention to that smiley-grin

I know that everyone knows that the "gift" label is bull but have you ever bought anything from eBay marked as "gift" and had the Danish customs open the package, estimate it's real value and charge you for it?

My experience with the Swedish customs is that they don't give a damn about letters. Guess they just x-ray and screen for drugs.
Maybe the Danish customs work differently.
24  International / Scandinavia / Re: Shipping/Customs to Denmark / Scandinavia on: June 18, 2013, 08:05:05 am
I regularly recieve letters from eBay sellers, both through Honkong Post and through China Post and they have never been subject to any taxes or extra fees.
As you probably know, they are always marked as "gift" with some bogus value.
25  International / Scandinavia / Re: Shipping/Customs to Denmark / Scandinavia on: June 18, 2013, 06:39:31 am
Trackable packages handled by UPS, DHL etc. are usually subject to horrible handling fees at the customs.
The fee usually consists of VAT (Moms) and a handling fee applied by the courier that takes the package through the customs. The handling fee is often ridiculos.

Regular letters seems to come through ok every time without taxes or fees. At least to Sweden.
26  Community / Website and Forum / Re: Problems with accessing forum on: June 17, 2013, 03:20:29 pm
Try adding to your trusted sites. No http:// or https://, just
At least it seems to make it possible to login.

Edit: possible to post too

Now back to Chrome smiley
27  Using Arduino / Programming Questions / Re: Virtual Wire on: June 17, 2013, 01:54:59 pm
That version of sample (1.3) is included in the 1.15 library so it might well be that the OP used the latest version. If not, of course the latest version should be used.

The error messages in the first post indicate that the library was placed in the libraries folder in the program directory instead of in the libraries folder in the sketch directory.
28  Community / Website and Forum / Re: I.E. problem with WEB site on: June 17, 2013, 12:56:55 pm
Note: I had this problem with I.E. 9 also.
         FireFox does not have this problem.
Then the problem is not the website. It is InternetDestroyer.

That might be your personal opinion but it doesn't help the many IE users much.
All browsers are different and it's a web developer's task to make sure that their web sites work in the browsers they intend to support. If it doesn't work they can hardly say it's the browsers fault and that the browser will have to adapt to their web site.
They can say "go crap yourself if you're using IE because I hate IE users" or "Please don't use IE because we can't support it" but I haven't seen the Arduino forum say any of that.
Or is your ignorant comment about "InternetDestroyer" to be taken as an official Arduino statement?
29  Using Arduino / Microcontrollers / Re: Struggeling to reduce power consumption's to a minimum on: June 15, 2013, 10:51:03 am
Another difference was typing "sleep_cpu();" instead of "sleep_mode();". Just typing sleep_mode() made it use 60uA more. I would like to know what the difference between the two are smiley-sad

Definition of sleep_mode() in sleep.h:
#define sleep_mode() \
do {                 \
    sleep_enable();  \
    sleep_cpu();     \
    sleep_disable(); \
} while (0)

I think the line sleep_enable(); inside the sleep_mode() function resets the BODS bits and anything else that you may have set between your first call to sleep_enable() and the call to sleep_mode().
30  Using Arduino / Networking, Protocols, and Devices / Re: Ethernet Shield for NANO??? on: June 11, 2013, 05:29:24 pm
You can't use the included Ethernet library with the ENC28J60 controller. There are other libraries that should work but I can't reccommend one.
Google a bit and try following one of the many tutorials out there perhaps?
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