make headlights & interior lights come on
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=136975
Printed Date: May 02, 2024 at 2:39 AM
Topic: make headlights & interior lights come on
Posted By: dablakmark8
Subject: make headlights & interior lights come on
Date Posted: July 21, 2014 at 6:16 AM
Hi guys,this question is for the mad scientist(member).
I got a client that has a vauxell lite and a mazda 6 vehicle,He has asked me to build a device that will allow his head lights to come on when he unlocks his car,i think the delay was 30 second before it switches off.
The problem i am having is that he only has remote central locking,no alarms in non of the vehicles and there is no flashing indicator light.So the only way to get a pulse for the circuit is via the central locking wires,preferably the unlock pulse..right.
So my circuit will have to be a timed circuit where a momentary pulse turns to a 12v negative to energize a relay for 30 seconds,I am looking for a cheap solution,whaqt are my options.I can use a 555 timer circuit but which one is the cheapest circuit to make,Those timed relays cost a pretty penny.Sorry for the bad english but i am afrikaans speaking
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the only interesting answers are the one that destroys the question.
Replies:
Posted By: oldspark
Date Posted: July 22, 2014 at 12:31 AM
Keep in mind that a 555 consumes ~10mA (standby).
The CMOS 7555 consumes less but is probably more expensive.
Some might use a PICAXE (eg, 08, 08M2) for similar cost and far less standby current - and far more programming options.
Cost difference between 555 circuits is probably negligible but that is something you should be able to calculate and compare to a DEI-528T timer relay or similar.
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