Cheap/easy idea for garage alarm.

[smegballs]

Thought about a simple garage alarm that could be cobbled together from junk box items. No need for mains power (as I've seen a fair few of you with garages but no mains leccy), just give the battery a charge now and then. No electronics/soldering required - it can all be done with normal auto crimp connectors and off the shelf parts.

https://i.imgur.com/eK00BJq.png

The "trigger switch" is up to your own ingenuity. An easy one would be to wrap wires around two sides of a clothes peg to make the switch, separating each side of the peg is an insulator attached to a line tied to the shed/garage door. If the shed door is opened, it pulls the insulator out, the clothes peg sides come together and close the switch.

https://i.imgur.com/F7ynqpr.png

Obviously you can sub any 12V horn for the nautilus, however pant-shitting may not be achieved with quieter horns.



Dear GCHQ/NSA don't put me on another watchlist for that image of the peg trigger device. This is a perfectly legit application for such a switch. Thankyouplease

[Major Doss]

A very tidy notion to use parts which many will have laying redundant. The trigger could even be multiplied in series to cover windows and such like. Very clever, Smeggers!
____________________
Antisocial phucker.

[-Matt-]

Very interesting to read as someone with zero-electronics knowledge

If you are looking for alarm though - i've had suprisingly good results from cheap PIR alarm systems in the past. Picked a new one up from a local 'pound shop' for about a fiver last week. They are battery dependant so ideally get some rechargeables and replace them every couple of months to be safe, but seem fairly reliable.

I tend to mount them near the door as its the first large object likely to trigger it and temporarily will hide/block the alarm from being fiddled with once its activated it once the doors flipped. Generally come with one or two wireless remotes [again battery reliant so something to keep going], they're not great on range but i've found they tend to respond once you're near the door so you can just deactivate and unlock at the same time.

[smegballs]

[Joncrete Cungle]

https://www.henrykrank.com/index.php?main_page=product_info&products_id=2964

[i.p.phrealy]

[WD Forte]

Keeping it simple
The ex bike/car /van battery would fare better in a box to keep it warm
rather then left to sit on a cold floor as they dont like it up em.

If its got an 'up and over' door,
You can buy mercury type tilt switches very cheaply from Ebay
or Maplins ( dearer) if in a rush

( if you see free standing electric heater in a skip it will/should have a tilt switch inside that can be salvaged)

I'd consider using a keyswitch on the door to arm/disarm it plus
an on/off led.
you'd only need 20mm and 5mm holes for these
and just the presence of them may dissuade the casual or
opportunistic theives



If you want go more complex the possibilities are endless
____________________
bikers smell of wee