And where i could find and how i can know what kind of driver to use for the led's there is allot of drivers over the internet .!

It's normally not recommended to use simple resistor current limiting for higher power leds, but rather drive them with proper constant current driver circuits.

Lefty

can u please show your example because when i try to calculate it i just get some extreme numbers ...

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Your resistor value is:

Vsupply - VLED / ILED

Vsupply = supply voltage
VLED = LED forward voltage
ILED = Current the LED usese

If your putting more LED's in series calculate the total VLED

This is basic ohms law R = V/I

For the power of the resistor it's ILED x Vsupply - VLED

Hello guys i want to know what kind of resistor i have to use for my hp led's i have 28v  charger witch one i want to use for my LEDS  so i have
16 hp leds 1w
Forward Voltage : 3.2V~3.4V
Forward Current: 300~350mA
Color temperature : 3300k ~ 3500k
Intensity Type: 60~70Lm
oh and i want to make then in one row or maybe two ..!

tried like 10 things can't get it running anyway
is it possible to use another router what i don't use to connect my ethernet shield ?

Hello .. First of all i hope i posted this topic in right forum ... And here come my question or troubleshoot i'm wondering can my laptop witch is connected to wifi internet can share internet trought my laptop Lan port so my ethernet shield is feeding from my laptop ... because my rooter is in other room so all the time running with my laptop to other room to update some code or make something new is boring ... so i hope someone could help me and i hope  u can understand something from my epic explain guide .
I'm using Arduino Uno
My OS is windows 7

Solved thank you guys for help !

hello every one i want to test my touchscreen but i can't find some small code . Maybe someone have some small code to share with me i just want to test my touchscreen maybe someone have like simple button or so .. using arduino uno + 2.4 inch TFT LCD Module Screen 240 x 320 Pixels ILI9325 !

Your right, I was thinking of something else.

OP, there are TFT screens that are plug and play, and arduino compatible, why didn't you get one of those? The SD card slot is for a micro though, not the regular one like you have.

can u give me some of the models of thous tft screens ? its just im searching for some tft screen ho don't take all the pints ! or maybe there is some witch one i could just connect to my sensor shield v 5.0 !

Hi there today i received my new tft screen but it seems that u cant connect it in easy way so maybe someone could help me with it ?

2.4 inch TFT LCD Module Screen 240 x 320 Pixels ILI9325 Arduino Compatible

i got it from ebay

datasheet : http://www.newhavendisplay.com/app_notes/ILI9328.pdf
some pictures :
http://i36.tinypic.com/2rxijus.jpg
http://i38.tinypic.com/29gmtzp.jpg
http://i34.tinypic.com/23j3m2r.jpg

oh and i have sensor shield v5.0 to maybe its possible to connect that lcd to that shield !?
can someone please help me with this  its my first arduino and i have no idea what  to do

Hello im new in this arduino thing so i just bought a arduino uno + arduino sensor shield v5.0 and TFT LCD ILI9325 screen and now im wondering how to connect all together is there some tutorial or maybe some one already know how to do that so maybe some off u guys could help me with this thing ..Best regards Arturs .