How can we make burgler alarms for our own house?
Asked by subhahar 8 years ago
Extremely low-cost SMS-based alarm, that will send a message to a number when the alarm is activated. must be small (10x50x40 cm) and have a long life battery and is to be deployed over a wide geographical area, all within GSM reception
Asked by lukassie 6 years ago
i have 6 volt dc motion activated alarm. i need help to to find where i must solder wires so that i will get 6 volts out to activate a solanoid.
Asked by waterpower 7 years ago
Asked by forgotenm 8 years ago
Hi, I am trying to make a simple alarm system for ill patients, the alarm will be activated through a mouse click on an alarm icon and trigger an alarm connected to the PC. Does anyone have any ideas on how to tackle this problem? Many thanks in advance :)
Posted by RohanQ 5 years ago
I wanted to make an alarm type thingy, ad I want to use the alarm from an alarm clock. I don't know how though, I tried connecting a cell to the wires that were already on the alarm, but it won't work. I think it's one of those piezo-electric crystal thingies. And I know I have to have pressure on it to work. How exactly would I use it?
Posted by Aeshir 10 years ago
Is there a device that would connect to my existing home alarm system and alert me via text or call that an alarm has occurred? Thanks.
Asked by ecaj 2 years ago
Can someone help me with this? I need a wireless activated buzzer or alarm. Similar to the cheap wireless doorbells where you push the button on the remote and the bell rings. Release the button, and it stops. But it needs to be a loud sounding buzzer or alarm, fairly high decibels, and did I mention very inexpensive? Also, the buzzer/alarm part needs to be as small as possible. I appreciate all your help!
Posted by wolfsmane 7 years ago
Hello everyone ^^ I'm here to ask about this circuit. I've been searching for a laser alarm circuit for a long time which locks itself when the beam is broke and keeps the alarm running unless if I want to press the reset button without the use of a relay. Unluckily, I wasn't able to find that kind of circuit in google... AND IT FELT HORRIBLE!!! =O Ahem ahem! Anyway, I've come up with an idea of combining the latching push ON and OFF circuit and the Laser alarm circuit. Will it work? please reply =( WILL THIS WORK-- https://www.instructables.com/id/DIY-Latching-Laser-Alarm/
Asked by Charles Mendoza 5 years ago
Ok so I need an alarm for my project, a very loud alarm. . . And I can't seem to get these dumb buzzer to output a decent sound. I have a lipo checker that uses these type of buzzers and they are ear shattering. I tried putting the regular buzzers and the were no where near as loud. Also if I want to use the tone function on the arduino, how do i make the buzzer louder?
Posted by HavocRC 3 years ago
I am searching for a circuit which can drive a siren circuit like this and can be activated by a laser pointer.I have tried a lot of these circuits but all had the same problem:The siren sounds only for a few seconds(As long as the interruption of the laser beam...) Thank you in advance!
Posted by pizza1993 6 years ago
Hello, I am interested in seeing if I can create some sort of alarm for my 10 year old son. He has autism and I'm looking for something kind of like a house arrest ankle bracelet BUT i don't want it to track where he is. (Not at this point anyway). For now i just want to see if I can make a distance alarm. I would strap a bracelet to his ankle and I could carry the alarm unit in my pocket to If he got more than 100 feet from my device I would hear an alarm. He has an issue with wondering away and the electronic monitoring companies want to charge hundreds of dollars to put a house arrest type monitor on him. If i could make something that would warn me when he starts to wonder that would be amazing! Can anyone point me in the correct direction? Thanks
Posted by author-unnknown 3 years ago
I assume the clock has the ability to turn the projector on/off. How hard would it be to hack in a remote control for this feature? (they dont seem to sell anything like this.)
Asked by 9zpvwz 6 years ago
Hi all my project idea : using laser beam and LDR to make a security alarm circuit , when the beam is cut , it will trigger the NE55 circuit for certain time (5 seconds only ) there is a lot of 555 dark-activated circuits on the WWW, i know , but all of them are like on/off switch what i need is one with adjustable delayed time can you help me ?? thanks in advance
Asked by lu2a 7 years ago
I just had an idea.... Someone needs to make a car alarm app for smart phones. It can use the microphone to listen for breaking glass, the speakerphone for playing pre-recorded messages (step away from the vehicle, the police have been called), the camera can sense movement inside the vehicle and the GPS can sense (and report) movement of the vehicle. All of this information can be sent in real time to the other phone that you carry with you. Installation is as easy as turning it on and tossing it in the seat! Compatible with any car! Battery backup! :)
Posted by AsianSpanker 7 years ago
We were asked to construct a burglar alarm using ultrasonic sensor with a micro controller Zilog Z8. It's our requirement for the Final term this semester. We also have difficulties in our documentation because it is in thesis format. I know that somebody can help us from Instructables. We definitely need documents so we can have ideas to be included in our documentation. Thank you so much. God bless. ^^,
Asked by AljonSalvatore 5 years ago
Hello all! I'm looking to design a range compact distance sensor that will sense 1-4 ft increments. If necessary i could modify a door alarm. id like to fab one or multiple if need be to sense the distances noted. I could utilize a buzzer or some way to record a voice that would alert to said distance. The battery voltage max is 4.2v dc and if it could be rechargeable that would be a plus. Any help on this would be greatly appreciated. Thanks!
Posted by Automan350 5 months ago
I'm a pretty deep sleeper, and I don't wake up very fast in the mornings, which is bad since I ride the school bus to school. I set my alarm clock, with a high volume, but it still doesn't wake me very good. I've thought of trying to make an alarm that flashes a strobe light, something like a deaf person might use, but didn't think it would work very good. So, my idea now is to think of a way to make an alarm clock that gives pulsating shocks when it goes off. I have absolutely (well, 99%) no idea how to connect it up, nor how to produce the shocks. I'm thinking a shock with high voltage, but low current, like static electricity. I figure that should wake me. Do y'all have any ideas, or better suggestions? Also, do you think that the shocks (if usable) would cause any dangerous effects on my health? Thanks!
Posted by Bran 10 years ago
I've been searching for an instructable that does that but couldn't find it. The basic idea is to put a small as possible tag to something(unpowered if possible) and have another small thing that can fit in your pocket. If the tag goes more than, say, 4,5 or 6 meters away your pocket box would warn you. I think its a great idea to protect from thieves but no idea on how could I build a device like that. Thanks
Posted by Saladino 9 years ago
I was wondering if you could make an electronic key or something like that so when she crosses or enters the area a buzzer or alarm goes off so she runs away.
Asked by jules15 8 years ago
Hey! I have an old home alarm system which is broken beyond repair. I just wanted to make sure if it is OK to charge the 12v battery at 2.1 or2.4 Ah with an ATX PSU at 30A? Will the battry just take 2A from it? If not I have the transformer that came with the Alarm, would that be safe to charge with? It's 12v BTW. Thanks. Never can be too careful. Also, I'm using it on a scanner light tube, this will be fine, yes? I have the starter, it is not a problem. It's weird though, when it is lit, you can pull out the ground on the light tube, not the starter and ut still stays lit. Weird. Thanks in advance!
Posted by Josho 10 years ago
I need a very simple way to see if power is ever lost to load. I am trying to run a long term test of at least 60 days. I have a UPS that is powering a load and I need to be able to determine if the 12 - 15 V dc that the UPS is providing is ever lost. The UPS has a battery that will supply power if the AC input is lost. The solution can be very simple and I really don't want the load to be reconnected if the current going to the load is ever lost. I need to know if the load is ever not powered, even for a brief instant. I was hoping there might be some type of switch that would open if the current stopped flowing through it. Sorry for the simplicity but I know very little about electronics. Thanks for any help or advice.
Asked by brentatespicorpdotcom 2 years ago
I salvaged a piezo sounder from a CO detector. The sounder (EFM-290ED rated at 9V) has 3 pins rather than the two I am more familiar with. The pins are labled G, F, and M. I have tired applying 9V across all combinations of the pins but haven't had any luck maiking it sound.
Asked by jrosserb 5 years ago
Http://www.nlcpr.com/images/PC1832_lr.jpg Hey, hope somebody can help me to getting this thing work properly, im not sure how to connect the keypad, smoke and move detectors... i got 3 zones to move detectors(means that in one floor i got all detectors joint on one wire, and now, where on that board i put red and black(+12 and -) yellow and blue(NO and C) That picture is not my taken, found it on inthernet. Thanks for any help:) Sorry for my bad english.
Posted by blackrock112 7 years ago
I want to change the alarm sound.
Asked by sheen16 4 years ago
I'm working on a project where I need to have a transmitter and a receiver with an alarm, so when they are apart a certain distance the alarm goes off. I need the alarm to be attached with the transmitter not the receiver, where it will be attached to a valuable stuff for example.
Posted by AmmarK22 3 months ago
Asked by Kero_1116 9 years ago
Hello guys, I need some help building a circuit. I'm new to electronics, so go easy with me. Is there a way to build and laser alarm circuit but instead of the alarm going on just when the beam is broken the alarm stays on until I turn it off? Circuits like Kipkay's only go off when the beam is broken. How can I make the alarm stay on once the beam is broken? Thanks
Posted by HavocRC 5 years ago
If the current is exceed the specified amperage, it will sound.
Asked by indomgl 7 years ago
I need a schematic of a circuit that provides a 12v output when a laser is picked up on a phototransistor. Essentially working in reverse of the laser trip wire alarm.
Asked by mightywetfoot 7 years ago
Dose anyone know how to build a super easy to use alarm clock using an arduino? I am prototyping different types alarm systems and trying to solve one person's specific problem with managing bed time. I welcome any: ideas, suggestions, hunches, guesses, or building plans. Just a few things: the clock has to use an arduino and it has to be portable. The reason why I'm building it myself instead of buying an alarm clock is that it needs to be utterly simple and have personal meaning to the user. I am open to it not having to use an arduino. It should be easy enough for a child 6 years old to use. They should be able to set the time and the alarm on their own.
Posted by hthnc-student 5 years ago
I was just wondering that like that laser alarm system can a cell phone be attached with a photo cell and when some 1 cross the laser the cell phone send a SMS or some thing like this and plz keep it in ur knowledge that this stuff should be able to built at home thanks !?
Asked by sinner8 8 years ago
I would like to trigger the alarm when it is under 80 ohm (Maybe). about the FSR force sensor -- > http://www.ladyada.net/learn/sensors/fsr.html
Asked by aliibaba 7 years ago