Destroyer_
Posts: 6
Joined: Wed Nov 14, 2018 4:46 pm

Ways to send data wirelessly

Wed Nov 14, 2018 5:08 pm

Hi, guys, I wanted to ask you if there which ways there are to transmit Data (a pic or webcam) wirelessly. I want to build a weather station with a live webcam. The station will be about 2km away. I don't want to buy a sim card for my pi. I don’t want to use walkie-talkies because everybody would hear my bit by bit transmission.

I hope you guys have better ideas than me.


Destroyer_
Posts: 6
Joined: Wed Nov 14, 2018 4:46 pm

Re: Ways to send data wirelessly

Thu Nov 15, 2018 1:46 pm

Do need a special receiver or is a normal 2.4ghz wifi device able to see the signal from the yagi antenna?

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topguy
Posts: 5410
Joined: Tue Oct 09, 2012 11:46 am
Location: Trondheim, Norway

Re: Ways to send data wirelessly

Thu Nov 15, 2018 2:13 pm

I dont think you need any special circuit and if you get a USB wifi adapter with a SMA connector, you can buy a commercial available Yagi antennas also.

https://www.amazon.com/dp/B008Z4I7WQ/re ... PDKIKX0DER

https://www.amazon.com/Alfa-AWUS036NHA- ... 004Y6MIXS/

But all of this might be a moot point if there is a big hill blocking the line of sight between your webcam and the receiving end.

Destroyer_
Posts: 6
Joined: Wed Nov 14, 2018 4:46 pm

Re: Ways to send data wirelessly

Thu Nov 15, 2018 4:30 pm

The Wikipedia page says that Yagi Antenna is transmitting or sending data: https://en.m.wikipedia.org/wiki/Yagi–Uda_antenna
If I want to send the pi a command I would need a second antenna facing my home?

Destroyer_
Posts: 6
Joined: Wed Nov 14, 2018 4:46 pm

Re: Ways to send data wirelessly

Thu Dec 27, 2018 11:14 am

I scraped the idea of building my own antenna. I bought 2 lite beam m5 from ubiquit. I configured them and tested their connection.
The Antennas are powered throw power over Ethernet. The funny thing is that in the original spec sheet it says ”24V, 0.2A PoE Adapter included” but in the quick start guide it says it is a 25V, 0.2A Poe Adapter. The reason why this is this a difference for me. I want to power that adapter with a 12V Car battery. I am already got a variable step-up circuit, I just to figure out were to solder my own 24V/25V onto. I couldn't find an official schematic online.

Destroyer_
Posts: 6
Joined: Wed Nov 14, 2018 4:46 pm

Re: Ways to send data wirelessly

Fri Jan 11, 2019 6:21 pm

Update: Ich found the right pins for the power. It works perfectly fine.
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