Oppo relay/electronics masters I need your help.

"nFamousCJ - Keeper of Stringbean, Gengars and a Deezul" (nfamouscj) 07/09/2014 at 21:02 • Filed to: None

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So here's the setup if you will, I'll have 2 different color demon eyes in my projector ( 2 and 3 ). How can I wire everything together so that when my side marker ( 1 ) is on 2 will also turn on but when I turn 3 on, 2 will turn off. THEN when the headlight ( 4 ) is turned on both 2 and 3 will be cut off.

Edit: Ok to make things easier 3 is eliminated all together. I'll have it on an independent toggle switch. So just 1 and 2 on together, 4 cuts off 2.

Jake - Has Bad Luck So You Don't Have To > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 07/09/2014 at 22:20

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Binary logic! I'm way too lazy to fire up MultiSim and make a logic table, but this could be accomplished with a breadboard, some NAND chips, relays, dc-dc power supply, soldering iron, wire, etc. but I doubt you want to go to all that trouble. Unfortunately my mere highschool-graduate education on the subject has no idea what else to do, unless you wanted to mess with microcontrollers.

twochevrons > nFamousCJ - Keeper of Stringbean, Gengars and a Deezul 07/09/2014 at 22:41

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Please excuse the illegible scribbling

The first relay passes 12v to the second relay when the sidemarkers are on (using the Normally-Open contact, marked 87 on most automotive relays), while the second passes 12v out only when the headlights are off (Normally-Closed contact, marked 87a). Then you can just use a SPDT switch (or the NO and NC contacts on a third relay controlled by a switch) to select which colour you want.

nFamousCJ - Keeper of Stringbean, Gengars and a Deezul > twochevrons 07/09/2014 at 23:13

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building on what you suggested ...