Low power long distance wireless data communication

Question

I am looking for a communication solution with the following requirements:

wireless
unidirectional, point to point
low power (li-ion battery powered, should operate at least one hour on the single charge)
low baudrate data transfer (cca 40 - 80 bauds)
long distance, in the terrain covered by the forest, behind the small hill. One km sholud be enough but more is better
using free band within EU

What technologies should I check? Are there any existing modules for this? I would like to connect it to Arduino.

I would love to hear how you got on with this project? – ojunk Apr 12 '20 at 17:53 — ojunk, Apr 12 '20 at 17:53

score 2 · Answer 1 · answered Dec 01 '15 at 23:11

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RFM12B or RFM69CW sounds like what you want. Operates in the ISM band. There's sketches available for Arduino and with a decent yagi antenna you should be able to reach that far.

answered Dec 01 '15 at 23:11

captcha

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Thanks. And what about http://www.seeedstudio.com/depot/420450MHz-Ultra-low-power-data-radio-module-p-2209.html or http://www.hoperf.com/upload/rf_app/HM-TRP.pdf? – Martin Ždila Dec 03 '15 at 21:37
Go for it! They're both 100mW and the HopeRF seems cheaper and more frequency-agile. A suggestion: I would not even use a feedline but connect the radio directly to the antenna. At these low power levels you want to keep losses to a minimum. – captcha Dec 03 '15 at 22:29

score 2 · Answer 2 · answered Jun 10 '16 at 18:37

The LoRa standard use spread spectrum technology, provides 20 to 30 dB improvement over traditional modes, when configure at the type of low speed that you require.

Some test documented on web shows 20km using 0.1 watt. These chip work at Global bands, EU, US ISM, 430, 8xx and 9xxMHz

The Adafruit sites as full tutorial for two Arduino libraries

Sigfox is a competing standard, using ultra narrow band

Adafruit hopeRF

score 0 · Answer 3 · answered Jun 12 '16 at 07:33

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For such terrain I guess something in lower frequencies would do better. There are some cheap wireless serial radio modules for Arduino that use 433 MHz.

Other viable solution is xBee, but it uses higher frequencies, and it is more expensive.

answered Jun 12 '16 at 07:33

Pedja YT9TP

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score 0 · Answer 4 · answered Jun 20 '16 at 18:36

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There are some type of NRF24L01 that are long range 3km+ rated. With a wifi amplifier (it works at 2.4GHz) you could also reach bigger distances.

answered Jun 20 '16 at 18:36

Alberto Perro

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Welcome to ham.stackexchange.com! – rclocher3 Jun 22 '16 at 16:58

Low power long distance wireless data communication

4 Answers4