How can I use a radio wave to turn on/off a siren?

Click For Summary

Discussion Overview

The discussion revolves around the feasibility and design of using radio waves to control a siren, focusing on the creation of a transmitter and receiver system. Participants explore various approaches and technologies that could facilitate this application, including radio frequency transmission and alternative methods.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests designing a radio signal using a specific schematic and inquires about creating a receiver to activate a siren.
  • Another participant proposes using a cheap radio receiver to detect a specific tone frequency from the transmitted signal, noting the limitations of the transmitter's range and the challenges of finding an open frequency in populated areas.
  • A different participant recommends using a garage door opener system, highlighting the need for a transmitter and receiver that operate on a set frequency and code, suggesting this could enhance security against hacking.
  • Another suggestion involves using ready wireless modules from a specific manufacturer, indicating that these could be connected to a relay to control the siren.

Areas of Agreement / Disagreement

Participants present multiple competing views and approaches without reaching a consensus on the best method to achieve the goal of controlling a siren with radio waves.

Contextual Notes

Participants mention limitations such as the range of low-power transmitters and the potential interference from other radio stations, as well as the need for specific frequency and coding mechanisms in some proposed solutions.

Harmony
Messages
201
Reaction score
0
How can I use radio wave to turn on/off a siren? I think it is possible for me to design a radio signal through this schematic:
http://www.aaroncake.net/circuits/fmtrans.htm

The problem is, how do I design a receiver that can switch on a siren by receiving the radio signal?
 
Engineering news on Phys.org
You could use a cheap radio receiver, and just bandpass the audio output to look for the tone frequency that you would be transmitting.

The circuit you show is for a typical low-power, unlicensed radio transmitter. The range of these transmitters is about 10m-20m, so don't expect too much. You also have to tune them to an open station frequency, so if you are in a highly-populated area with lots of FM radio stations, you will have trouble finding an open frequency.

You might consider using an IR link instead of FM. You could start with a kit, like the one in the lower right corner of this page:

http://www.transeltech.com/kits/kits1.html
 
Last edited by a moderator:
Try a garage door opener system

Try using a garage door opener system.
Two reasons.
1-you need a transmitter on a set frequency that trans mits a code
2-you need a receiver that receives a set frequency that needs a code to turn the power on.
Instead of the door opening and closing you could have the sireen latch on or off and the security of any hacker reduced.
good luck
 
you would get ready wireless modules from Link Technologies they make ready modules you can further connect a buffer relay to switch on / off the siren

Rick
 
Last edited by a moderator:

Similar threads

  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 11 ·
Replies
11
Views
2K
  • · Replies 20 ·
Replies
20
Views
4K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 68 ·
3
Replies
68
Views
6K
Replies
20
Views
3K
  • · Replies 2 ·
Replies
2
Views
1K