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View Full Version : Electronics wizards: 555 monostable one shot?

Avatard
08-24-2010, 12:43 PM
I need a circuit to prevent doorbell re-trigger for 5 seconds (either that, or a hitman to take out my UPS guy).

Motherfucker is either neurotic, or has fucking Parkinsons.

Regardless, I'm sick of his horseshit, and I want a circuit to prevent the doorbell from being re-triggered. Alternately, I'm considering a circuit to send the first push to the doorbell, the second push to null, and the 3rd to a huge fucking airhorn, mounted above the door.

All suggestions considered...
t-homo
08-24-2010, 01:12 PM
Had you asked 3 years ago, I could have told you everything you need to know.
LeeNetworX
08-24-2010, 02:50 PM
All suggestions considered...

You could always talk to him and ask him to ring only once.
Avatard
08-24-2010, 03:15 PM
You could always talk to him and ask him to ring only once.

If it was just one guy, yeah. Seems there's no one particular person, and apparently the FedEx guy has Parkinson's too. Maybe my doorbell just has that "ring me fucking incessantly" look about it. Whatever. I'm liking the air horn option more and more, although my daughter (who was also rudely awakened this morning by the neurotic delivery person du jour), and my GF both suggested some means of high voltage electrocution.
Rider
08-24-2010, 03:16 PM
Rig the doorbell so that when he pushes the button, he gets 110v right through his fucking finger. See how many times he pushes the doorbell then.
KSGregman
08-24-2010, 03:25 PM
You could always talk to him and ask him to ring only once.

Why must you be such a killjoy? Injecting some sensibility into an Avatard rant? His Tourette's hadn't even kicked in yet. :lol:
the chi
08-24-2010, 03:25 PM
What he said. That was my first thought, but I didnt want to seem like I supported electrocuting the delivery guy. I've been shocked by a doorbell before, wasnt too painful and it definitely made me never ring it again. :lol:
LeeNetworX
08-24-2010, 03:38 PM
If it was just one guy, yeah. Seems there's no one particular person, and apparently the FedEx guy has Parkinson's too. Maybe my doorbell just has that "ring me fucking incessantly" look about it. Whatever. I'm liking the air horn option more and more, although my daughter (who was also rudely awakened this morning by the neurotic delivery person du jour), and my GF both suggested some means of high voltage electrocution.

If it happens with everyone who rings it are you certain you don't have a sensitive/faulty doorbell button? I've seen some that ring multiple times even when you are pushing it in only once. Spend $3 and try replacing the button.
Avatard
08-24-2010, 03:54 PM
The button works flawlessly. The problem is apparently not unlike the computer analog of "PEBCAK"...we'll call this a "PEBUAB" problem (Problem Exists Between User And Button).

I seek an automated solution.
Particle Man
08-24-2010, 04:40 PM
How 'bout a sign that says "the more often you push the button, the more shells I can load"
Trip
08-24-2010, 04:47 PM
I can do it, just need to find the time. If you are looking for something quick,there is probably a schematic on the net for something close.
Avatard
08-24-2010, 04:51 PM
How 'bout a sign that says "the more often you push the button, the more shells I can load"

Of the social engineering solutions suggested so far, this may be the most effective.

Trip, am I even on the right track with the 555 Timer IC? It strikes me that if so, this may only require the chip, a cap, and a resistor...
Trip
08-24-2010, 05:24 PM
Of the social engineering solutions suggested so far, this may be the most effective.

Trip, am I even on the right track with the 555 Timer IC? It strikes me that if so, this may only require the chip, a cap, and a resistor...

555 is old school, you can probably do it for cheaper and have more options with a programmable chip.
Avatard
08-24-2010, 05:48 PM
But I am old school; KISS.

:shrug:
Mikey
08-24-2010, 05:59 PM
555 is old school, you can probably do it for cheaper and have more options with a programmable chip.

Honestly, you could probably do it with just a diode and a resistor. My brain is fried right at the moment, but I may be able to come up with something for you by the morning.
Avatard
08-24-2010, 06:09 PM
I suppose I can stand one more morning of this without going postal.

Thanks!
Mikey
08-24-2010, 07:02 PM
I suppose I can stand one more morning of this without going postal.

Thanks!

OK, I got to thinking about it, and I had a burst of inspiration. I'm still not thinking all that clearly, but it sounds to me like what you need is a simple time-delay relay. They usually have about a 5-second delay and should accomplish exactly what you want for just a few bucks. I'm thinking you want to go with one that acts as a normally-closed relay wired in series with your circuit. This page should get you started:

http://www.allaboutcircuits.com/vol_4/chpt_5/3.html

Make sure you measure your voltage output and current draw at the point in the circuit where you are going to add the relay. IIRC, most doorbells run 16V, but yours may be 24V depending on your transformer and chime setup.

This all makes perfect sense in my brain, but I'm not sure how well that translates into text, so hopefully you get the gist. If it's gibberish, let me know and I'll try to clean it up.
Avatard
08-24-2010, 07:18 PM
Awesome. Zactly what I need. 5 Seconds should eliminate spurious button presses from all but the most determined Micheal J. Fox impersonators.
LeeNetworX
08-24-2010, 08:23 PM
I suppose I can stand one more morning of this without going postal.

Thanks!

Don't you mean "without going carrier"?
Avatard
08-24-2010, 08:45 PM
No, the postal bitch apparently has fucking Parkinson's too.

Can't seem to get anyone's mail right either. I'm always having to negotiate "hostage exchanges" with my neighbors.

The other day she left a priority mail box with $260 worth of software perched atop my mailbox.

That whole idea about the airhorn is starting to really sound attractive. I need to also rig it to a camera, to take reaction shots, though.
Mikey
08-25-2010, 06:51 AM
No, the postal bitch apparently has fucking Parkinson's too.

Can't seem to get anyone's mail right either. I'm always having to negotiate "hostage exchanges" with my neighbors.

The other day she left a priority mail box with $260 worth of software perched atop my mailbox.

That whole idea about the airhorn is starting to really sound attractive. I need to also rig it to a camera, to take reaction shots, though.

If you want to do that, then I suggest one of these.. Can also be rigged as a time delay so that it takes a couple seconds after they press the button:

http://www.smarthome.com/_/ProductResults.aspx?Ntt=current%20sensor