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ignition activated relay to led

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Member - Posts: 1
Member spacespace
Joined: June 08, 2014
Location: California, United States
Posted: June 08, 2014 at 12:30 PM / IP Logged  
Hello all,
I have a Street Triple 2014 and need help with the wiring for some safety LEDs going in the plastics.
Basically I would like no power drawn while the bike is off (via relay?)
And when the bike IS on, be able to switch the lights on/off. (only using at night for better visibility.)
I would have the relay powered by the ignition somehow and have a fuse there.
Then a switch after the relay to power the lights on/off.
I'm pretty lost on which resistors and relays to use. I already have the 12V supply of course and I have a few COM-08662 UV LEDs from SparkFun I plan on using.
Any suggestions and help appreciated!
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: June 08, 2014 at 5:56 PM / IP Logged  
All you need is a switch powered by IGN +12V. There is no need for a relay.
Those LEDs are 20mA 3.0-3.6V types recommended to be run at 16-18mA (download their datasheet from SparkFun).
There are various design tools & guides on the web, or see my recent example here.
Design for the max voltage your vehicle experiences - eg, 14.4V, 14.8V.
i am an idiot 
Platinum - Posts: 13,679
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 08, 2014 at 7:01 PM / IP Logged  
Yes, what Oldspark said.

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