Hi, I have a project in which I need to send data from one place to another using RF. I will be sending only some gps cords, temperature, humidity and atmospheric pressure. I will have a clear line of sight on some field that is located about 500 meters away from small city. The distance between the two RF modules will be around 1000 meters. I am not sure which RF module to use and I am complete amateur when it comes to them. I am currently thinking about buying RF24L01 with PA and LNA mainly because it's really cheap, well documented and I have read that some people managed to use them over the 1000 meters. Is it a good one or should I buy something else? I am willing to spend maxium of 15 euros per module (preferably around 10). I am from Europe
Where do you live? The laws on what's legal or not vary by location. I'd hate to give you advice that's good here in the US but would get you a fine in Europe.
These LoRa radios have excellent performance, are very easy to use, and with a proper antenna and clear line of sight, you can expect reliable data transmission over many km.
For a complete MCU/Radio solution, it is hard to beat these.
I live in central Europe.
I'll put another vote for a LoRa setup.
In Europe I believe you'll use the 868MHz setting.
Hello asdaafvd
Take a view here to get some ideas:
worth considering is the TTGO LoRa32 module with ESP32 microcontroller (builtin WiFi, Bluetooth Classic and BLE) , onboard LoRa chip, OLED and external antenna
supported by the Arduino IDE and the Arduino LoRa library and the TTN-ESP32 LorAWAN library
In Europe you can use 434Mhz or 868Mhz bands. 868Mhz is used for TTN\LoRaWAN, the 868Mhz band has less interferance than the 434Mhz band.
Duty cycle on the 434Mhz band is normally 10% and 1% on 868Mhz.
in the UK I use 868MHz - I find 433Mhz tends to interfear with other equipemnt, e.g. sets off radio controlled fire alarm
Hi, I need two LoRa modules for school project. I can use 433Mhz rf module as well but I prefer LoRa. I am supposed to send some gps cords, temperature, humidity and atmospheric pressure readings every second. The distance between the modules will be around 1000 meters with clear line of sight. Will I need to make some type of directional antenna like yagi to reach that distance or will some coil one/sma 5dbi one be enough?
over about 140m in built up areas, you need a better antenna,
Depending on the environment, Iād expect a simple yagi would do 1km in open rural areas.
Can I trust this yagi calculator and build the yagi using it? I am really inexperienced it this field.
Hi,
Yes you cab trust that site.
Also Google;
yagi lora antenna homebrew
Tom.. 
Threads merged to help with continuity.
For LoRa, no need at all.
An antenna made with a 1/4 wave length of wire would get you much further than that if you had clear line of sight. The main issue with long distance LoRa comms is the curvature of the Earth.
Oh I am glad to hear that. Also which LoRa module should I buy? I am from EU so I guess it should be 868MHz
868Mhz is more free of interferance.
Your allowed slightly more power at 868Mhz versus 434Mhz so the range is about the same.
although they tend to be more expensive than Microcontroller modules with an external LoRa module I would recommend getting a module with microcontroller and LoRa module on same PCB - it saves having to use jumper wires which are a source of poor connections and intermittent problems
e.g. ttgo-lora32, Adafruit Feather 32u4 LoRa, TTGO-Beam, Hiltec LoRa 32, The Things UNO, etc
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