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what resistors to pay or what to do ? Answered

OK guys i need help in a simple project
i need to make 15 board every board have 5  white LED its 5mm 3.5 v some boards will be connected
i when and got 150 LED and 5 test board  but cuz i don't know what resistors i didn't get any so i made my first board connected a Nokia charger to it , it gives DC 5.7 v and 800mA  it burned all 5 LED i used .
i will cut the boards down to 15 or 20 small ones
OK i will connect 5 boards to gather.
how can i calculate what resistor to use .
should i use this charger or i get another one.
what should i pay to make that work

.:update:.
i got 150 resistor 150 ohm
2 220v to 5v 1000 mA adapter 
and 5 more test boards


the first test i got  from a usb cable the lad give me a blue color that is a sign of great power  the with the resistor it gave me white color
so i will make the 2nd test with the adapter

Discussions

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lemonie

8 years ago

"They" should teach this sort of thing in school, like part of a Science lesson or something...

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hfayed1lemonie

Answer 8 years ago

in my country they do but only if you are a science major in high school
but that is to late for me i am 19 years old 3 year in college , will at least i am i pro programmer

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lemoniehfayed1

Answer 8 years ago

Oh right, I did some electronics when I was 14/15 I think (long time ago now).

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Re-design

8 years ago

Google "led calculator'. They will help you figure out the circuit.

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iceng

8 years ago

Each LED needs a resistor connected to the battery like the picture.

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ResistorLED1.png