XPost: alt.autos.toyota, rec.autos.tech, alt.autos.honda   
   From: Trueno@AE86.gts   
      
   On Tue, 21 Aug 2007 08:24:26 -0700, John S. wrote:   
      
   >> Or, a little more sophisticaed: put a switch inside the car. Now, this   
   >> would mean triggering the 'alarm' when getting into the car, something I   
   >> don't want to do at 1 AM when I'm leaving on my 'paper route'. So, some   
   >> kind of delay would be good. I was thinking a capacitor between the hot   
   >> line and the 1st relay, so the cap charges and when it reaches charged   
   >> it triggers the relay and starts the flasher.   
   >   
   >   
   > All I've read so far are questions about how the car owner would switch an   
   > unidentified alarm system off and on.  Since you are not buying an   
   > off-the-shelf alarm what kind of alarm system are you proposing.  And more   
   > importantly how will the alarm be triggered by a potential intruder.   
      
   All I want is something that will blow the horn, and maybe flash the   
   lights.   
      
   In it's simplest form, a switch mounted somewhere outside the car that   
   turns the system 'on' by providing a ground path for a relay. When someone   
   opens a door, the relay closes, current is passed to a flasher (like for   
   your turn signals) and then to the horn and headlight relays. Very simple.   
      
   Also, this is instantaneous. As soon as they open the door, the horn   
   starts. There is an 'always on' current source (courtesy lights) that do   
   not turn off when the dome light is turned off, so I intend to use this   
   for the 'trigger'.   
      
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