Loading...
« previous topic   next topic »
Pages: [1]   Go Down
Author Topic: 12 UV leds arduino  (Read 736 times)
0 Members and 1 Guest are viewing this topic.
initzero
Offline Offline
Newbie
*
Karma: 0
Posts: 11
View Profile
« on: October 13, 2012, 05:17:00 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Hello all !!!!
How can i get 12 UV leds running on 5v arduino ?????

12-LED UV Flashlight Silver (3xAAA)
http://dx.com/p/12-led-uv-flashlight-silver-3xaaa-4014

What resitor do i need for serial conection????

thank you for the help...
Logged

johnwasser
Massachusetts, USA
Offline Offline
Tesla Member
***
Karma: 108
Posts: 6607
View Profile
« Reply #1 on: October 13, 2012, 07:34:17 pm »
 Bigger Bigger Smaller Smaller Reset Reset
Measure the voltage across an LED when the flashlight is lit.  Call that V.

Disconnect one of the LED leads and measure the current through that diode when the flashlight is lit.  Call that C.

Subtract V from 5 to get the voltage across the dropping resistor.  Divide that voltage by the current C (in Amps) to get Ohms.  Use one resistor per diode.
Logged

Boffin1
Cape Town South Africa
Offline Offline
Edison Member
*
Karma: 17
Posts: 1123
A newbie with loads of posts, and still so much to learn !
View Profile
WWW
« Reply #2 on: October 13, 2012, 09:52:53 pm »
 Bigger Bigger Smaller Smaller Reset Reset
And be very careful with UV LEDs, I was temporarily blinded for a couple of hours by them without even looking into them on purpose !
Logged
We live in the era of the smart phones and stupid people.

initzero
Offline Offline
Newbie
*
Karma: 0
Posts: 11
View Profile
« Reply #3 on: October 14, 2012, 09:16:25 am »
 Bigger Bigger Smaller Smaller Reset Reset
Thank you guys for the replay!!!

 johnwasser
i already desolder the leds from the tourch.
I m going to try to hook up them all.
Thanks for the tip!!!

Boffin1
Thanks for the warning!!!!
Logged

Pages: [1]   Go Up
Print
« previous topic   next topic »
 
Jump to: