Mini Ultra Pro V3 – Lora end to end

Hi,

I am a complete newbie to LoRa or LoRaWan so bear with me :). I am considering to use the Mini Ultra Pro V3. It hits all the right buttons for my project, which involves a monitoring station which is very difficult to access (for months). I’ve got everything except for the radio transmission running based on a Pro Mini. I do not currently have access to a gateway and, at least for prototyping reasons I am considering if I could use two Mini Ultra Pro’s with radio to simply transfer data, i.e. one in the field, logging and transferring the readings, and one on my desk, writing everything to SD. Does this make sense?

You could use the LoRa layer (without the LoRaWAN stack as you do not own a gateway) by running the RadioHead library. The Mini Ultra Pro also has an on-board serial flash which you could use as logging. You can take a look at the code in this post I wrote. You can just use a PC to pull out the data. Do note that the on-board serial flash is only 2 MB (16 Mb) which is not a lot but I believe it is more than adequate in most cases. The SerialFlash library by Paul Stoffregen allows accessing the serial flash like how you would access an SD card on Arduino platform.

BTW I am based in Singapore, not sure if I need to consider anything with regards to working frequency if I do such end-to-end solution.

Singapore runs on 915 MHz band.

• This reply was modified 7 years, 9 months ago by LIM PHANG MOH.
• This reply was modified 7 years, 9 months ago by LIM PHANG MOH.

So now I see that the mini pro ultra is out of stock in the RFM95W, 915MHz combination. Is it expect to come back in stock any time soon?

Towards the end of next week. Currently busy building the Mini Ultra LoRaWAN boards. May I know what antenna connector you are looking at?

As I am looking at about 3km of max. reach (but pretty open, non-urban), the RFM69HCW is probably not feasible, but I see the V2, 915MHz is still in stock. So I can either go for that combination and limit my range, or for the v3, RFM95W, 868MHz. As I would do pure Lora at the moment, would it work (I read some conflicting stuff online)? I understand upgrading to LoRaWan will be out of the question then…

The furthest we have went with RFM69HCW is slightly less than 2 km is very open test ground. I wouldn’t put my bet on it to beyond that. You can run the board on pure physical LoRa using RadioHead library and move to LoRaWAN later using the LMIC library.