The Oak by Digistump > Oak Project Ideas

DriveWay entry monitor array

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defragster:
Will have to see - but I'd need that on both ends - or is the cantenna that receptive from distance as well?

dougal:
I'm not positive, but I'm *pretty* sure that you can probably just use it on one end. Also the "line-of-sight" might not have to be *completely* clear. A few tree branches and such might not be a big problem? Seems worth a try! :)

jamieisboss:
https://en.wikipedia.org/wiki/6LoWPAN seems to be pretty much designed for this, there doesn't appear to be a reason why the hardware couldn't to it, it'd be a case of adding to the firmware but how much I dont know, if the boards are ipv6 ready then maybe not as much work as it sounds?

On the other hand presumably you've got a wireless AP outdoors that the Oaks will be talking to if you've got a 500t driveway, could you not just buy a high gain antenna/antennae for that, not sure what the laws are or where you are but I can't imagine you'd get in trouble/anyone would notice if you were only covering your own property. If the Driveway is relatively straight, you could even add a dish to make it more directional

PeterF:

--- Quote from: defragster on June 11, 2015, 10:36:12 am ---One other thing I saw was - creating a MESH with NRf24 devices to connect?  Perhaps those would be lower power with Pro's or something?  But unless they gain range and use much less power it would be adding another layer and it seems one OAK would end up like your post and need to have an OAK with both radios active for routing.

--- End quote ---

I don't know if you're still thinking about this, but I'd be strongly considering the nrf24 route for all the nodes bar the last, and do an oak with nRF for that if you want to end at a wifi connection / web page. you can get nRFs with external antenna which will do a decent range, and then go for ones with Power Amps if you really need a power boost... but are a bit power hungry when going to those extremes. Normal nRFs with external antenna in mesh mode would probably do the job you need.

Pete

defragster:
I just saw that Adafruit is making a breakout version of this device (low data rate) HopeRF RFM95W 915Mhz [Long range: 15 - 20 km.] - LoRaTM Ultra Long Range Wireless Transceiver: http://www.ebay.com/itm/181442612615

AdaFruit breakout is $30 - the raw radio is $10: https://www.adafruit.com/products/3072

It is SPI - not sure if driver code will work for OAK - for remote places it could be tied to a Teensy or other.

http://www.radio-electronics.com/info/wireless/lora/basics-tutorial.php

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