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Forum Index : Microcontroller and PC projects : Help with LORA modules
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| srnet Senior Member  Joined: 08/08/2014 Location: United KingdomPosts: 164 |
What LoRa settings were you using ? $50SAT is Silent but probably still working. For information on LoRa visit http://www.loratracker.uk/ |
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OA47 Guru  Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
Srnet: Here is the config screen. The only change I have made is the output power which was set at 20dbm out of the packet.  |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9749 |
Cool, keep us updated!  You would probably increase reliability and range if you drop the "AirRate". It does depend on how many bytes you are sending though. I eagerly await my 915MHz units to test.  Smoke makes things work. When the smoke gets out, it stops! |
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| srnet Senior Member Joined: 08/08/2014 Location: United KingdomPosts: 164 |
Ah IC. That effectivly just defines a baud rate, I would have an idea of the potential range if I knew the bandwidth, spreading factor and code rates in use. $50SAT is Silent but probably still working. For information on LoRa visit http://www.loratracker.uk/ |
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| davematt Regular Member  Joined: 27/09/2011 Location: AustraliaPosts: 55 |
Update... With a 1/4 wave whip transmiiting from 3 metres up I could receive at ground level 3.5 km away, using a small yagi. This was not line of sight, but across open country with just small patches of bush intervening. I am confident this could be improved, but I ran out of paddock Message was a short sentence at 2400 baud, seemingly 100% reliable. Pretty chuffed! |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
Dave, are you using the 433Mhz units? Your transmission distance is very encouraging. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9749 |
Also, what output power? 10dBm? 20dBm? Can I assume that you guys are running the modules at 3v3? Still waiting on my ones to arrive.... *drool* Smoke makes things work. When the smoke gets out, it stops! |
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| davematt Regular Member Joined: 27/09/2011 Location: AustraliaPosts: 55 |
@Grogster, I'm using 20dBm, haven't investigated power consumption yet. I'm running from 3.3V, but thinking about it, runnning the radio direct from 1 lithium would make more sense. Thoughts anyone? |
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| Bill7300 Senior Member Joined: 05/08/2014 Location: AustraliaPosts: 159 |
@Grogster, do you have a link to your source of the 915MHz modules? Bill |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9749 |
Sure, here you go: 915MHz version of module Smoke makes things work. When the smoke gets out, it stops! |
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| Bill7300 Senior Member Joined: 05/08/2014 Location: AustraliaPosts: 159 |
Thanks. Interesting looking devices. Bill |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2171 |
sort of related https://www.sciencedaily.com/releases/2017/09/170913193030.htm |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9749 |
My 915MHz modules have arrived. That's not bad - ten days or so airmail. They even included two little USB-serial adaptors, which were not in the auction listing - nice touch, and I will use them around the workshop. I hope to setup a test link with them in the next couple of days, and I also want to put one on the spectrum analyser to see what it's output it like. Smoke makes things work. When the smoke gets out, it stops! |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
I need some help with my LoRa network. As discussed earlier I have set up an in field unit that has the SDI-12 probe interrogated by a Micromite and the information passed back to base over a virtual serial port using the LoRa radio link. This set up has worked flawlessly for some weeks sending back data requests every 10 minutes when polled by the base Visual Basic software. The Micromite software has the console serial port connected to the radio (my original thoughts were that I could remotely access or modify the MMBasic software via this port) and the software is waiting at an INPUT prompt looking for the ID code of the unit and ignore if not the right one. The problem I now have is that the network crashes if I have more than one remote unit listening and responding to the ID call. I first thought that I had issues with the power peaks required to transmit back and as mentioned by another poster, I put a 1000UF cap across the power leads of the LoRa units. This did not help so I decided to put a delay in the return transmission (up to 500mS) again no improvement. I decided to have a play with the settings on the radios firstly dropping the power to the lowest possible and fiddled with other areas that I really don't have a good understanding of, mainly due to the very small amount of explanation in the handbook. Any suggestions from shedders very welcome. Graeme |
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| OA47 Guru Joined: 11/04/2012 Location: AustraliaPosts: 1013 |
Had another thought that may lead to a solution. Something simple as usual. The non-ID units will be returning the ? prompt and clashing with real data. Was a good idea at the time  |
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| srnet Senior Member Joined: 08/08/2014 Location: United KingdomPosts: 164 |
I wrote a short introduction to LoRa and how the settings affect range here; Long Distance Tracking and Monitoring with LoRa - Introduction See 'What is LoRa?' on page 5 $50SAT is Silent but probably still working. For information on LoRa visit http://www.loratracker.uk/ |
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