Pi-to-Pi Communication without wifi

[RedPaladin]

Hey, I was just curious if there was something capable of having two Pi's to communicate with one another in the absence of an internet connection. The project I need this info for will be outside and way from any source of wifi connection. I appreciate any advice or information the Raspberry Community can give me.

-RP

[joan]

Depends on the distance.

You could connect Ethernet port to Ethernet port which should be good for 100 metres. You could use a serial link for shorter distances.

[FTrevorGowen]

Hey, I was just curious if there was something capable of having two Pi's to communicate with one another in the absence of an internet connection. The project I need this info for will be outside and way from any source of wifi connection. I appreciate any advice or information the Raspberry Community can give me.
-RP

There are several (physical) ways (some not "networking" methods) using different, wired connections such as:
wired-LAN to wired LAN
USB to serial (http://www.cpmspectrepi.webspace.virgin ... pters.html )
serial to serial
USB-to-USB networking (http://www.cpmspectrepi.webspace.virgin ... Cable.html )
And you could still use WiFi, depending upon how the Pi's are powered, using something like these on one of the Pi's:
http://www.cpmspectrepi.webspace.virgin ... outer.html
http://www.cpmspectrepi.webspace.virgin ... ridge.html
(As @joan has already pointed out it also depends upon the distance between the Pi's)
Trev.

[RedPaladin]

Hey, I was just curious if there was something capable of having two Pi's to communicate with one another in the absence of an internet connection. The project I need this info for will be outside and way from any source of wifi connection. I appreciate any advice or information the Raspberry Community can give me.
-RP

There are several (physical) ways (some not "networking" methods) using different, wired connections such as:
wired-LAN to wired LAN
USB to serial (http://www.cpmspectrepi.webspace.virgin ... pters.html )
serial to serial
USB-to-USB networking (http://www.cpmspectrepi.webspace.virgin ... Cable.html )
And you could still use WiFi, depending upon how the Pi's are powered, using something like these on one of the Pi's:
http://www.cpmspectrepi.webspace.virgin ... outer.html
http://www.cpmspectrepi.webspace.virgin ... ridge.html
(As @joan has already pointed out it also depends upon the distance between the Pi's)
Trev.

So how exactly do those last two links work? From what I am thinking I will not be able to have a cable attached to the two so that rules out the usb linking cable. I have never seen that Vonets bridge before.

[kusti8]

You can make your own hotspot with one of the Pi and then have the other connect to it. No Internet needed, it creates it's own network. Works really well for me.

[RedPaladin]

You can make your own hotspot with one of the Pi and then have the other connect to it. No Internet needed, it creates it's own network. Works really well for me.

Forgive me, but can a Pi just make its own hotspot? What I mean is do you need a special attachment like a wifi dongle or something to do this?

[kusti8]

You need a WiFi dongle of course, but after that it's just a matter of following a few steps that you can find online. Both Pis would need a WiFi dongle.

[FTrevorGowen]

You can make your own hotspot with one of the Pi and then have the other connect to it. No Internet needed, it creates it's own network. Works really well for me.

Forgive me, but can a Pi just make its own hotspot? What I mean is do you need a special attachment like a wifi dongle or something to do this?

Which, AFAIK, is what the LB-link device can do in A(ccess) P(oint) mode IIRC. (It's a while since I've played with the "bridge" device and it may not support "hotspot creation")
In my O.P. I could have added "wireless transceiver's" running of the GPIO's, but I've not used any of those myself.
Trev.

[RedPaladin]

http://www.amazon.com/nRF24L01-Wireless ... QMX06RPDJB

So I've found this transceiver. I like the idea of using this. @kusti8 are you talking about a dongle like this: http://www.amazon.com/Raspberry-Pi-WIFI ... B009FA2UYK. Or are you saying something like a wifi modem? An internet modem?

[kusti8]

Yes, that's what I'm talking about. It's much less hassle than trying to send messages via radio and since it's a simple network, you can do much more. Range isn't as good as radio though. Get a bigger dongle with an antenna to go farther.

[RedPaladin]

Ok! Thanks for your help! You've cleared up some of my questions

[Pramodh B]

You can make your own hotspot with one of the Pi and then have the other connect to it. No Internet needed, it creates it's own network. Works really well for me.

how to do that,can u tell me how