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this is easy and inexpensive wireless alarm with 200m range if module is insert inside car or >500m if module is outside

two modules: RX and TX

receiver module make sound alarm and led blink when detect signal

transmit module is connect to any device or switch to turn it on

Hardware is arduino attiny85 and nrf24l01, very inexpensive!

In attached files to be printed in 3d for RX and TX case

PCB module is editable with fritzing

http://fritzing.org/home/

you can make this single face PCB with cnc or transfer method

http://fritzing.org/projects/car-motorcycle-o-bicy...

attiny85 is easy to program with arduino nano or uno with this guide

RX/TX modules are powered with 9v battery but you can use any DC power with 5v to 20v voltage without problem.

For car alarm i suggest to use car inside lights to be activated with the opening of the doors.

example

this module can send code of alarm so it can be used as alarm for the house by inserting it in the doors, windows or putting in series with sensors (gas, fire, infrared)

<p>I'm puzzled there are 2 ino files,one for receiver,another for transmitter.so do i need to program two attiny chips or burn these two files in one chip.</p>
receiver 1 x attiny85 with receiver program and 1 x nrf24l01 <br><br>transmitter 1 x attiny85 with transmitter program and 1 x nrf24l01 <br><br><br>
<p>Hello, I can not operate the receiver with an ATtiny84. I put a LED on pin 13 (D10) but not blinking.<br> Thank you...</p>
<p>Hi, looks nice.</p><p>However, not that I am an expert or that it changes much to your project, but what has the 'nrf24l01' to do with WiFi?</p>
<p>nrf24l01 use same frequecy 2.4ghz</p>
<p>Unfortunately, that does not make it WiFi. Bluetooth also operates on 2.4GHz. </p><p>Wireless yes. WiFi no. </p>
<p>yes nrf24l01 use same frequency but not support 802.11 standard then not properly wifi standard</p><p>is only generic indication but this module can create your own network with tcp protocol <br><br>https://github.com/TMRh20/RF24Network</p>
<p>You really need to change your description.</p><p>It is not at all WiFi, it is NRF24.</p><p>When you look at the poster above he is also confused and your reply is even more confusing (you mention a WiFi module where it is a NRF24 module).</p><p>As mentioned, I like the project but the description is just wrong...</p>
<p>ok</p>
<p>hi, that is an interesting project but i can't seem to see which part is wifi related?</p>
<p>rx board and tx board is equal, only program is different</p><p>you can see in this photo in the left wifi module and in the right board with attiny TX module without mosfet driver</p><p><a href="https://cdn.instructables.com/FVU/BI8S/I95GXCL6/FVUBI8SI95GXCL6.LARGE.jpg" rel="nofollow" style="">https://cdn.instructables.com/FVU/BI8S/I95GXCL6/FVU...</a></p>
think you need to show more steps so that it's more understandable. good in theory but lack of procedure.
<p>i make this projects in my free time and English not is my native language </p><p>if you or other people make this project you can develop complete detailed guide with the link of the inventor </p>
<p>This looks like a great idea. Very nicely done!</p>

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