Hello i am new to this forum i am looking for some information . I am trying to install car alarm into my car witch would also trigger siren that is inside the house . I found 433Mhz RF wireless transmitter and receiver module on amazon would want to connect transmitter to probably my alarm output that triggers siren and then transmitter should send signal to receiver and trigger alarm inside the house two . Alarm i am using is Clifford G5 i believe it sends 12V to siren that is in side the car RF wireless transmitter how ever takes in 5V . so i am seeking for help with information on how should i proceed and accomplish what i have in mind .

 

If the "wireless transmitter" can be controlled simply by switching the 5 volt power on and off then a very simple IC voltage regulator will allow powering it from that 12 volt siren power feed. A very simple circuit and not expensive, either.

 

ok so i would need like stepdown 3A module to step down from 12 to 5V . Then connect Siren wires to module and module to transmitter right . So when alarm goes on it sends 12V to voltage regulator and it will send 5V to transmitter witch will send signal to receiver . Then on the other side when signal received i need to send signal to siren to turn on on probably 12V some kind of power supply ? and 5V power supply for receiver to have it running all the time ?

 

Nothing was mentioned about sending any signal back to the siren in the car. Also, no mention was made about powering the receiver in the house, or the siren in the house.

 

do i need to send signal back to siren in the car ?

 

Is the car’s siren not loud enough to hear in the house? I have, in the past, heard sirens from cars several houses away. Quite annoying actually.

 

its not super loud , factory sirens usually lauder . i will also disable car siren most likely and will only have inside house will act as silent alarm

 

ok so i would need like stepdown 3A module to step down from 12 to 5V . Then connect Siren wires to module and module to transmitter

A 7805 3-pin voltage regulator and a couple of small capacitors (identified in Figure 1 of the 7805 datasheet) would work as well and may be less expensive than the module you’re considering (I didn’t price the components). You probably could use a 1A module as well. The transmitter likely doesn’t need 3A. That could be less expensive as well.

You could install an automotive (SPDT) toggle switch inside the car so you could switch between the local and remote siren. That way, you could enable the siren when out shopping.

The existing 12V to the siren would go to the common terminal of the toggle. One of the other terminals would connect to the siren. The other terminal would connect to your 5V regulator.

 

A 7805 3-pin voltage regulator and a couple of small capacitors (identified in Figure 1 of the 7805 datasheet) would work as well and may be less expensive than the module you’re considering (I didn’t price the components). You probably could use a 1A module as well. The transmitter likely doesn’t need 3A. That could be less expensive as well.

You could install an automotive (SPDT) toggle switch inside the car so you could switch between the local and remote siren. That way, you could enable the siren when out shopping.

The existing 12V to the siren would go to the common terminal of the toggle. One of the other terminals would connect to the siren. The other terminal would connect to your 5V regulator.

what about receiver ? i just need 5V usb charger receiver thing ? and 12V power adapter for siren and some king of switch that receiver can switch on siren ?

 

Nothing was mentioned about sending any signal back to the siren in the car.

That's not what he meant. He is using the word "send" for both an RF signal from the car to the house, and a hard-wired connection between the house receiver and the house alarm/siren.

ak

 

what about receiver ? i just need 5V usb charger receiver thing ? and 12V power adapter for siren and some king of switch that receiver can switch on siren ?

Of course you need to power the receiver. And a 5V USB charger would likely work.

There are 5V piezo buzzers that are quite loud which can be used instead of a 12V siren. Something similar to the alarms in smoke detectors.

BUT, a 5V USB charger may not be powerful enough to drive a piezo buzzer. You have to add up the power requirements of the receiver and buzzer and get a power adapter (like a wall wart) that can supply more amperage than the two devices require. The specifications of the two devices will tell you how much current they require. A thrift shop is a good place to find inexpensive power adapters.

By the way, the car body may contain enough metal to block the transmitters signal. You’d have to test to find a good location. My remote car starter or remote key often doesn’t work if there’s another car between me and my automobile. That’s why the remote receiver is mounted on my windshield.

 

The 433 MHz xmit modules commonly sold barely work on 5V. And I believe they work up t 12V, giving you much better range. They also do not use anywhere near 1A, let alone 3. I power one from the common rectangular a 9V battery for a remote and it lasts a year.

Can you link to the transmitter you are using?

 

The 433 MHz xmit modules commonly sold barely work on 5V. And I believe they work up t 12V, giving you much better range. They also do not use anywhere near 1A, let alone 3. I power one from the common rectangular a 9V battery for a remote and it lasts a year.

Can you link to the transmitter you are using?

not using anything yet sill sourcing but had this in mind RF transmiter&receiver

 

Those transmitter/receiver pairs just provide a wireless link. They don’t transmit any signals, such as an on/off signal you’re looking for. They are meant to be used with microprocessors that are programmed to send and receive a message.

Here is an example of how they’d be used.

What you’re looking for is a wireless remote control module, like this. This has four channels; you could use just one. They have relays to switch external devices on and off. They come with a battery operated fob to provide the control. In your use case, you could disassemble the fob and short the pushbutton terminals together with a solder blob or a short piece of wire. Then, use a 12V to 3V (or adjustable) voltage regulator module to switch the remote on/off. I’ve used these in a similar manner.

 

Distance between car and house? I am seeing and have used 2 channel and 4 channel wireless relay cards which use a simple and easily hacked keyfob for the transmitter much like keyless entry into a vehicle. Not like the transmitter requires long term power. Keyfob batteries last a long time so unless you plan to have the alarm sound daily a keyfob battery should last a year or two easily. If your alarm sounds daily I suggest relocating to a new neighborhood. Receivers are 12 volt and will run on any 12 volt wall wart.

Ron

 

distance is less then 20 meters would say . so i would just wire key fob to speaker 12V output ? and when alarm triggered will send 12v to key fob and key fob to receiver ? I have already been robbed( many thousands worth of stuff as this is company van with a lot of expensive tools ) thats why want to have speaker in the house

 

distance is less then 20 meters would say . so i would just wire key fob to speaker 12V output ? and when alarm triggered will send 12v to key fob and key fob to receiver ? I have already been robbed( many thousands worth of stuff as this is company van with a lot of expensive tools ) thats why want to have speaker in the house

No, not quite. Something triggers the alarm right? I would find how and where the alarm is triggered. If for example the actual audible siren is triggered with 12 VDC I would tap that and let it also drive a 12 volt automotive relay. Then use the normally open relay contacts in parallel with a key fob button. This is done much easier than it sounds. Vehicle alarm sounds and key fob transmits to receiver in your house (or close location) giving you another audible alarm.

Ron

 

I'm no expert, but it seems like you're on the right track. Adding an additional audible alarm to your van's existing system could be a good idea. But as Reloadron mentioned, you'll need to find out how and where the alarm is triggered first.
If you're worried about the distance between your van and your house, you could also consider adding just a GPS tracking device to your van.
But I hope you don't mind me saying, it's always a good idea to take additional precautions as well. Perhaps you could look into getting a sturdy lock for your van's doors, or parking it in a well-lit area.

 

No, not quite. Something triggers the alarm right? I would find how and where the alarm is triggered. If for example the actual audible siren is triggered with 12 VDC I would tap that and let it also drive a 12 volt automotive relay. Then use the normally open relay contacts in parallel with a key fob button. This is done much easier than it sounds. Vehicle alarm sounds and key fob transmits to receiver in your house (or close location) giving you another audible alarm.

Ron

alarm can be triggered by dual stage Vibration/Impact Sensor, Glass break sensor , its also wired with door sensors so if alarm is on it will trigger if any of doors gets open and send 12v to siren for 30 sec

 

so if alarm is on it will trigger if any of doors gets open and send 12v to siren for 30 sec

OK so the end result of tamper is 12 VDC to the siren. I would go to any automotive parts store, buy a common 12 volt automotive relay and socket. Like this one. I would place the relay coil wires (85 & 86) in parallel with the siren wires. Siren On relay On. Next place the relay normally open contacts (87 & 30) in parallel with the key fob button(s). Siren energizes, relay energizes, relay energized same as button push on key fob. The only tedious part of this is soldering a few small wires across the key fob button(s). A Google of wireless relay board should bring up a dozen hits. Anything from one to four channel or more. Something like this. Any of this type board I have seen offer a few modes, There are 4 operating mode(momentary/toggle/latched/delay mode). You want Momentary Mode so as long as transmitter button is held closed (Siren On) your receiver relay is active.

Ron