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61  Forum 2005-2010 (read only) / Frequently-Asked Questions / arduino as ICSP programmer on: November 07, 2008, 10:30:59 pm
Hi, I came to this  http://www.geocities.jp/arduino_diecimila/bootloader/index_en.html website, made the connections, but cant manage to bootloard my atmega8

the information on the website if for the atmega168, and im not finding a way to make it work witrh atmega8

does anyone tried this, or have any idea on what should I change to make it work?
thanks  smiley
62  Forum 2005-2010 (read only) / Frequently-Asked Questions / arduino standalone question on: August 22, 2008, 06:47:22 am
this is my first project using the atmega programmed using  the arduino, but standalone.
 
I'm not sure if I made all right, so if you could take a look at the circuit at see if there is any problem on it.  Wink
 
here's the link: http://img.photobucket.com/albums/v107/tigerbr/1stproject.png
 
thanks a bunch  Grin
63  Forum 2005-2010 (read only) / Frequently-Asked Questions / Please, check if this is right on: August 19, 2008, 10:11:36 pm
This is my first project using the atmega programmed using  the arduino, but standalone.

I'm not sure if I made all right, so if you could take a look at the circuit at see if there is any problem on it.  smiley-wink

here's the link: http://img.photobucket.com/albums/v107/tigerbr/1stproject.png

thanks a bunch  ;D
64  Forum 2005-2010 (read only) / Frequently-Asked Questions / ATMEGA8-16PU works with arduino on: August 19, 2008, 07:23:43 am
ATMEGA8-16PU

I don't know about that 16PU, would like to know if it works with arduino.

thanks smiley-grin
65  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: my first post: arduino, clock, LEDs... on: April 13, 2008, 07:07:22 pm
Quote
Daniel,

to use a led you must know it's voltage and current.

In case of using it with Arduino pins (that works with 5v.), you must calculate the resistor value using the first Ohm Law:

R=U/I

where U is (5-led's voltage) in Volts, and I is the led's current in Amperes.
R value is in Ohm.
In your example, R=(5-3)/0,02A=2/0,02=100ohms.

I'm sure you can find this in your Electrical Engineering School Books...

Yes, thanks! smiley I wans't sure because everywhere I find examples using 220ohm resistor for leds.
66  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: my first post: arduino, clock, LEDs... on: April 12, 2008, 11:50:31 pm
Quote
Quote
- clock in general: how precise is the arduino board? do I need an extra quartz? And how would
I use it?

- how big is the arduino mini? I've read about width and lenght (3x1 cm), but I've seen nothing
about the height of the board...

- LEDs: I'll need to order a number of LEDs. What will I have to look at while ordering them?
Do they need to be 5V? Or could I also order 3V LEDs? And where can I find information which
LEDs need what kind or resistor?

- and finally: do you know of a super easy explanation of shift registers? I've read the tutorial
on this page, but I frankly don't quite get it. I'll certainly work it out for myself, but it would
be nice if there was an easy explanation of the concept behind it, somewhere...

The Dieci has a quartz crystal on it.  It should be accurate within about 5 seconds a day.  That's comparable to a commercial quartz watch.  

The mini is in the form factor of a standard dip package.  Including pins it's maybe 7mm thick (that's my estimate).

The LED question is a lot more complicated than that because what people don't usually recognize is that they're current devices, not voltage.  Basically though, if you want 20mA, the resistor should be ([supply voltage] - [led voltage]) / 0.02.  Or 50*(supply voltage - led voltage).

Supper easy explaination of shift registers would be "serial in, parallel out"  or "parallel in, serial out"  depending on the model.


So, if I want to use a bright let that uses 3v/20mA, I should use a 100ohm resistor instead of a 220ohms resistor to have a better light?
thanks
67  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: LED Driver on: April 12, 2008, 11:41:12 pm
How many leds can I use with this circuit from  http://www.arduino.cc/en/Tutorial/ShiftOut
in the website, it shows up to two sets, but is there any problem of using more? what about the mA usage, will arduino support all that?
68  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Can I use the programmed chip? on: March 12, 2008, 06:48:30 am
Thanks, that's what I was looking for!  smiley-wink
69  Forum 2005-2010 (read only) / Frequently-Asked Questions / Can I use the programmed chip? on: March 11, 2008, 08:45:50 pm
After I've done all the programming and testing with arduino board. What should I do to take off the microchip and use it in my project, on my board? Should I just follow the data sheet  then? :-?
70  Forum 2005-2010 (read only) / Bar Sport / Re: Arduino T-Shirts for Fans on: February 22, 2009, 02:41:53 pm
@n00b, just on yours
71  Forum 2005-2010 (read only) / Bar Sport / Re: Arduino T-Shirts for Fans on: February 21, 2009, 07:11:42 pm
ok ok, just some ideas smiley



72  Forum 2005-2010 (read only) / Bar Sport / Arduino T-Shirts for Fans on: February 21, 2009, 12:09:02 am
Hey ppl,
what would you think of a shirt like this?



i could make them and ship from brazil, all for a good price. anoter way to spread the arduino way smiley-grin
73  Forum 2005-2010 (read only) / Bar Sport / Re: freeduino.org not updating? on: March 08, 2010, 07:59:19 am
maybe im a bit dumb, but cant find a place to send links
74  Forum 2005-2010 (read only) / Bar Sport / Re: freeduino.org not updating? on: March 08, 2010, 04:57:09 am
I mean, they are not adding new links smiley
75  Forum 2005-2010 (read only) / Bar Sport / freeduino.org not updating? on: March 07, 2010, 12:38:39 pm
the website freeduino.org is not updating new arduino pages??
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