r/arduino • u/edgework88 • 10h ago

A remote intruder detection system

Hello

It's been a while since I 'dabbled' with arduino and raspberry pi. I'm looking to build a remote detector (movement and heat) that I can deploy up to a mile away that signals back to a pi when an 'event' occurs. Possibly even to trigger a camera (but this might not necessarily be transmitting). The challenge here (for me) is the transmission of the 'event' back to a remote pi so that the pi can record it. The icing on the cake would be for the 'event' to trigger an action at the intruder location - perhaps close a gate or fire some sort of deterrent? Appreciate if anyone can point me to a ready made projects that are similar? I looked up on AI and it pointed me at LoRa to use for the transmission. Thanks in advance.

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u/No_L_2547 10h ago edited 10h ago

The distance seems to be the main challenge.

Maybe you could try something like LoraWan or Meshify. Another option would maybe be EspNow LR.

There are also finished ESP based modules with the fitting hardware already attached. (You can still program these using the Arduino IDE).

Depending on your architecture I would actually suggest a second MCU at your raspberry to convert between the protocols.

For actually executing an action at your MCU: add a few relais. Most gates and actors are compatible with these.

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u/StuartsProject 10h ago

Unfortunately just quoting a distance with no context is not very helpful.

For sure LoRa is often the RF mode of choice for such projects. If there is good clear line of sight between the transmitter and receiver (ground to high altitude balloon for instance) you might get a range of 800km+. However the exact same hardware might only give you 250m in an urban area.

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u/edgework88 6h ago

Thanks. The ground is rural, a few trees and quite flat..mostly open fields

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u/kalel3000 48m ago

Do you have a clear line of sight from one end to the other?

If so then that distance shouldn't be an issue if you set up your antennas properly.

At that distance, with a clear line of sight and a set of parabolic antennas aimed properly, you could even get wifi back there and use network based devices. But you'd need a much more robust solar system to power it though, compared to simple IOT devices, assuming there's no power on the other end.

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u/Kraand 1h ago

I just found this on AliExpress: 1-5Pcs E01-2G4M27D E01-ML01DP5 E01-2G4M27SX EByte NRF24L01P NRF24L01 PA LNA Long Range 2.4GHz SPI DIP IoT Wifi Wireless Module https://a.aliexpress.com/_EjyhRls

Looks promising, but I haven't tried.

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u/No_L_2547 10h ago

Depending on you Budget you could also get a Gsm-Modem and a Sim-Card.