Introduction: Car / Motorcycle or Bicycle Wireless 2.4ghz Alarm Range 500m 10$ Budget
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
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)

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14 Comments
7 years ago on Introduction
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.
Reply 7 years ago on Introduction
receiver 1 x attiny85 with receiver program and 1 x nrf24l01
transmitter 1 x attiny85 with transmitter program and 1 x nrf24l01
Reply 7 years ago
Hello, I can not operate the receiver with an ATtiny84. I put a LED on pin 13 (D10) but not blinking.
Thank you...
7 years ago on Introduction
Hi, looks nice.
However, not that I am an expert or that it changes much to your project, but what has the 'nrf24l01' to do with WiFi?
Reply 7 years ago on Introduction
nrf24l01 use same frequecy 2.4ghz
Reply 7 years ago on Introduction
Unfortunately, that does not make it WiFi. Bluetooth also operates on 2.4GHz.
Wireless yes. WiFi no.
Reply 7 years ago on Introduction
yes nrf24l01 use same frequency but not support 802.11 standard then not properly wifi standard
is only generic indication but this module can create your own network with tcp protocol
https://github.com/TMRh20/RF24Network
Reply 7 years ago on Introduction
You really need to change your description.
It is not at all WiFi, it is NRF24.
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).
As mentioned, I like the project but the description is just wrong...
Reply 7 years ago on Introduction
ok
7 years ago on Introduction
hi, that is an interesting project but i can't seem to see which part is wifi related?
Reply 7 years ago on Introduction
rx board and tx board is equal, only program is different
you can see in this photo in the left wifi module and in the right board with attiny TX module without mosfet driver
https://cdn.instructables.com/FVU/BI8S/I95GXCL6/FVU...
Reply 7 years ago
think you need to show more steps so that it's more understandable. good in theory but lack of procedure.
Reply 7 years ago on Introduction
i make this projects in my free time and English not is my native language
if you or other people make this project you can develop complete detailed guide with the link of the inventor
7 years ago on Introduction
This looks like a great idea. Very nicely done!