Intruder burglar alarm 12 volt with timer

CAPTAIN FANTASTIC

CAPTAIN FANTASTIC

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Tricky question...
The thing with intruder alarms is that they grow, alarmingly (pun intended).
You start with a sounder, then you add an alarm timeout (so it doesnt piss the neighbours off at night). Then you add an entry delay so you can turn it off before it sounds when you enter. Then you add an exit delay (about 3/12 years...) so it wont trigger after you set it and before you get out of the door. Then theres keypads, different zones, exit routes and,well it grows.

Now, should you develop an electronics hobby or https://www.ebay.co.uk/itm/Wireless-Safety-PIR-Motion-Detector-Sensor-Burglar-Intruder-Alarm-With-2-Remote/223550619895
 
Lon nan Gruagach said:
Tricky question...
The thing with intruder alarms is that they grow, alarmingly (pun intended).
You start with a sounder, then you add an alarm timeout (so it doesnt piss the neighbours off at night). Then you add an entry delay so you can turn it off before it sounds when you enter. Then you add an exit delay (about 3/12 years...) so it wont trigger after you set it and before you get out of the door. Then theres keypads, different zones, exit routes and,well it grows.

Now, should you develop an electronics hobby or https://www.ebay.co.uk/itm/Wireless-Safety-PIR-Motion-Detector-Sensor-Burglar-Intruder-Alarm-With-2-Remote/223550619895
Click to expand...

Very much agree with the above. I have some 15 years experience with alarm systems in the automotive industry and can tell you, there is nothing like a "plug and play". You are asking for a lot trouble buying something what you have to modify to suit your purpose. The only disadvantage of a totally autonomous device like this one is, it can be stolen ;-). The hard-wired systems are a bit more thief proof, but the need of an installation and dependence on the boat battery are distinct disadvantages. I (consider my experience) was experimenting with these for some time before settling for something similar to this.
With the PIR system on a boat you have to be ready for some false alarm. Soon you find out, however meticulously you secure all loose items, the nearest choppy sea will prove you wrong. Very annoying and hard to avoid. But if you want to keep what yours, you have make some compromises. Good luck! :-)
 
Graham376 said:
I would expect false triggers with a PIR on a boat. A easily seen simple alarm type key switch on the instrument panel with a flashing led next to it and a couple of alarm stickers will persuade many thieves to look for easier pickings.
Click to expand...

I don't think it would stop thieves in some of the third world countries: you have to nail everything down.

In New Guinea they are terrified of snakes so take an imitation rubber snake with you!!
 
Graham376 said:
The OP's in the Bristol Channel, doubt they have many snakes there or immigrants from new Guinea:)
Click to expand...

Geez I didn't think of that!:rolleyes: (Obviously you are very, very smart)

Unlike you, I have no idea where The Captain is planning to sail in the future. Yachts can move around you know!!:rolleyes:
 
Last edited:
Thank you all for the replies. I agree that a burglar alarm can start as a simple system and end up adding bits, becoming too inconvenient. I will start with a simple portable PIR and see how it goes.
 
CAPTAIN FANTASTIC said:
Thank you all for the replies. I agree that a burglar alarm can start as a simple system and end up adding bits, becoming too inconvenient. I will start with a simple portable PIR and see how it goes.
Click to expand...

I think it is a wise decision. Just beware of the potential problem I mentioned before. Nothing more embarrassing than walking in the cop shop to report your anti-theft device has been stolen :-).
 
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