just want the chirp

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puttster

Member - Posts: 24

Joined: August 21, 2006

Posted: September 25, 2007 at 2:54 PM / IP Logged

I'm fixing up an old 60's car and I leave it parked on the street. What I would like is a proximity alarm, one that chirps when someone looks in the window to see if I have a radio worth stealing. I can mount an on/off switch on the dash. Can I just buy the sensor, or do I have to get a module, an alarm and etc?

Putts

kola7126

Copper - Posts: 93

Joined: September 13, 2007

Location: Russian Federation

Posted: September 25, 2007 at 6:36 PM / IP Logged

Everything, that You need:microwave sensor, relay, siren and certainly on\off-switch.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 26, 2007 at 4:52 PM / IP Logged

Kola is spot on but I would add a pulse timer relay set for 30 secs to actuate siren for that long when inner zone breached. The relays are required to boost the low current from the sensor,

puttster

Member - Posts: 24

Joined: August 21, 2006

Posted: September 27, 2007 at 10:47 AM / IP Logged

At least now I know that the chirping comes from the siren, not the sensor! Will any cheapo siren make the chirp?

Howie, I was hoping the timer would be in the sensor. Otherwise for me to close the switch on the dash and get out of the car I will have to be pretty speedy. Do you mean get a a pulse timer delay instead of a regular relay, or in addition to it? without one what happens? will it just keep on chirping?

sarcomax

Copper - Posts: 276

Joined: November 09, 2005

Location: California, United States

Posted: September 27, 2007 at 12:56 PM / IP Logged

you could use a dash switch combined with your door trigger. You would open the door, flip the switch to on, and then whe you close the door the system arms. When you get into the car by opening the door then it would disarm the system temporarily until you flip the switch on the dash. That is if you just want to warn people away and not acctually protect the vehicle.

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: September 27, 2007 at 3:36 PM / IP Logged

Sarcomax is quite right, I didn't about entry exit. You need a relay for the warn away and a pulse time timer for the inner zone. If only a warnaway then you can dispense with the pulse timer and linking a switch to the door contact, you just need a relay and a siren.

puttster

Member - Posts: 24

Joined: August 21, 2006

Posted: October 03, 2007 at 12:47 AM / IP Logged

I don't think my car is good for stealing (could be, though). Mainly I get passers-by at midnight looking for a radio and will bust the window and dashboard to grab it. That's why I think I just need a chirp.

Instead of a siren & relay do you think this would work? http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=96545 I could buy a microwave proximity sensor and replace whatever sensor that comes with it now, maybe save myself a day' s worth of wiring.

tom

KPierson

Platinum - Posts: 3,527

This member consistently provides reliable information

Joined: April 14, 2005

Location: Ohio, United States

Posted: October 03, 2007 at 9:03 AM / IP Logged

It might be easier to simply install a red flashing LED in the dash to give the appearance of an alarm. If you are worried about passerbys looking in the car they will surely move on to an easier target if they see a flashing red LED inside your car.

Kevin Pierson

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: October 03, 2007 at 11:36 AM / IP Logged

Get a 12v flashing relay with leads from Radio Shack or a similar place. Connect red wire via a 1amp fuse to a 12v+ permanent. Connect the black wire to an ignition circuit. As soon as you turn the key this will extinguish the light.

usabuilt

Copper - Posts: 161

Joined: September 11, 2007

Location: United States

Posted: October 03, 2007 at 1:31 PM / IP Logged

why not just buy an alarm, probably end up costing less than peice mealing it all together, plus you have starter kill, just in case.

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just want the chirp

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