Suggestions for low cost Controller + Rf module unit

Projects General Guidance
1

Hi,
I would like to know any suggestions for a low cost Controller + Rf module. My project description is I need to send a sensor's data from around 10 sensor units to a common control unit via RF (all 10 sensor units would be around 600m from main control unit ). Does anyone know of any existing components for doing this? Need it to be accurate and economic.
Thanks!

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How much data per sensor and how often? LoRa is useful for this type of application provided you don't want to send a lot of data and/or send it often. There are I think commercial sensors for temperature etc with LoRa embedded. What is your measure for "economic"?

3

How about a Moteino:
https://lowpowerlab.com/shop/product/99

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Hi @jhaine . I need to send data of a water level sensor every 30 mins. It should be in total under $10-$15 per unit

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Lora is cenrtainly worth considering for long distance communications

I used a The Things UNO Lora Module to transmit water level sensor data over LoraWAN every 30 minutes to the Cayenne desktop for display, e.g.

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also worth looking at would be the Adafruit Feather 32u4 RFM95 LoRa Radio

a lower cost alternative would be the add on RA-02 Lora board available for a few £ on Ebay
do a web search for arduino lora ra02 you will get plenty of links

would you require LoraWAN communication to the cloud or just local Lora communications?

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Hi @horace . Thanks for the suggestions. I would need to ultimately send the data to the cloud

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any idea what the target cloud application would be as that would determine the communications required.
For example, if using Cayenne you could consider low-lost RA-02 Lora modules for the remote sensors communicating to a Adafruit 32u4 Lora module - results could be uploaded to Cayenne using Lora WAN (requires a LoraWAN gateway in the area)
if the target cloud application requires MQTT your Lora sensor could communicate with an ESP32/RA-02 which would use WiFi to the cloud to upload (requires a local WiFi facility)

Edit: you would need to check what frequency is allowed in your country

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