Now I detect motion with my Arduino Nano and 3pin motion detector:


When detector triggers, I need to send signal (distance at least 5km) to another Arduino Nano and catch it. As far as I understand, 433Mhz is the optimal frequency for this.

Please suggest me what should I use? Which circuit, protocol etc. The solution should be as simple and as cheap as possible

Thank you in advance!

 

Simple and cheap solutions do not exist for communication over 5Km. 433MHz transmitters that are cheap and simple top out at about 10m.

 

Simple and cheap solutions do not exist for communication over 5Km. 433MHz transmitters that are cheap and simple top out at about 10m.

I mean I need a single module, as simple as possible, without gathering a lot of modules. Of course it won't be very cheap

 

Best bet is GSM (cellular.)

 

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These claim 15km
https://www.tp-link.com/us/business-networking/outdoor-radio/cpe510/
but first you have to get your data onto ethernet (something like a USR-k5 will send RS232 over ethernet)
One advantage is that you don't have to buy SIM cards
It works at 5GHz, so it will be line-of-sight.

 

I use WiFi to get to the internet, then to anywhere.

 

These claim 15km

I use WiFi with very good antennas and get 5 miles or 8km. It must be line of sight with no trees. One end is on top the house and the other is on a 5-story building. At first I used 2.5ghz but it will not work in the rain. Then I used 5ghz which can cut through water.

 

The output of the Arduino fed by a motion detector is not data, it is simply on and off.

 

The output of the Arduino fed by a motion detector is not data, it is simply on and off.

Correct, it is a datum.

 

hi agu,
It sent something like this on a 433MHz system
E
// Compose output character
static char *msg = str_out.c_str();

rf_driver.send((uint8_t *)msg, strlen(msg));
rf_driver.waitPacketSent();

 

I can imagine that you have three options:

1) Dedicated RF transmitter/receiver
2) GSM
3) Internet

What you also need to consider is "line of sight". Landscape and impeding objects can influence your RF range.

 

Get under the hood of a (discarded) cell phone and send an SMS message? Or https://docs.arduino.cc/retired/shields/arduino-gsm-shield

 

Maybe have a look at some of the various LoRa boards?
I made some irrigation sensors that tried to use SMS for the signalling but found there is no guarantee that the SMS will get through in time. I thought my device was not working during testing and triggered it repeatedly. It appeared to send the SMS ok but the target phone did nothing. Then, quite some time later, a stack of SMSs were received. This delay rendered the product dead as the sometimes long delay rendered it unusable.

Redoing them all as LoRa devices would be ok, but I lost interest.

Have a look here for instance...
https://www.seeedstudio.com/catalogsearch/result/?q=LoRa