/diy/ - Do It Yourself

Anonymous Sat Dec 21 11:58:00 2019 No.1737923 [View]
File: 38 KB, 1314x845, horn timer.png [View same] [iqdb] [saucenao] [google]

>>1737888
Nice numbers

So I came up with this 555 timer circuit to drive the horn for about 10 seconds.
The second 555 timer creates a pulse that should trigger a relais at the output so that it stays on for about 1 second and off for about half a second.
That tilt sensor is a good idea and simple enough. I just have to secure it so it doesnt trigger automatically.
I also added an indicator LED that stays on until I "unarm" the device to see if someone has been messing around with my plants.

Adding one of those arduino things to send me an SMS when it gets triggered would top it off but I dont think the signal will reach me.

Can I legally build a radio transmitter strong enough to receive the signal from my underground garage to my house, which is like 70 meters away?

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/diy/ - Do It Yourself

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