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Liquid Soulder

Member Since: May 25, 2018

Country: United States

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Neptune the Grey

The motivation behind the "Three Quick Tips for Using U.FL" tutorial

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Details of a silly problem with a silly solution: How to not overwrite your outgoing SPI data buffer when using the Arduino core libraries

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Three Quick Tips About Using U.FL

December 28, 2018

Quick tips regarding how to connect, protect, and disconnect U.FL connectors

SparkFun LoRa Gateway 1-Channel Hookup Guide

November 15, 2018

How to setup and use the LoRa Gateway 1-Channel in Arduino.
  • Sweeeeeet! Reminds me in a (much more sophisticated way) of the stick sculpture I put together when I was little. I’d love to try this out

  • Hi - good eye. The part used here is the CH340C which has an internal oscillator. This makes it a lot simpler for us to include in designs than the CH340G

  • Woah, those would have have been really helpful, thanks for sharing! I also really like the neat clamper + bendy arm contraption.

  • Awesome, good luck and keep us in the loop about how it goes!

  • Good question. The simple answer is “yes, but we haven’t proven it personally.” Here’s a little more info.

    You’ll be able to find a frequency setting function in the majority of the LoRa libraries out there because generally speaking all the LoRa radio modules use the same Semtech SX1276 chip at their core. The RFM95W is one such module so it should have an adjustable frequency range and be compatible with those libraries.

    You can see an example of what I’m talking about in the LMIC Arduino library. The config.h and lmic.h files both have references to both 915 MHz and 868 MHz. Just a little more digging should turn up a function that is used to set the frequency during initialization. It might be as simple as defining #define CFG_eu868 1 instead of #define CFG_us915 1

    We haven’t tested the modules at 868 MHz, however, so if you get this working we’d love to hear about it so that we can say definitively in the future that it is proven. Thanks for asking a great question!

  • No, you should be able to do that with little trouble on a breadboard. Hook up your wires in the way that the schematic shows. Then you should be able to follow along with the hookup guide and use all the same software. Cheers!

  • Hi - you are correct this is only the “digitizer” layer. It is a clear glass pane that can sense capacitive loads like fingers but it doesn’t have any intrinsic output ability. There’s a whole host of cool things you could combine this screen with: Addressable LEDs, RGB matrices, 7" E-paper display, or even a hand-drawn UI that to slide underneath.

  • That’s a pretty good assessment. I’d elaborate by saying that single-channel gateways are great for personal use, including posting data to the internet on networks like The Things Network, however they do not play nicely with stranger’s devices and so they don’t contribute to building a true LoRaWAN network that anyone can use.

    Indeed the radio module is only designed to listen to one channel at a time so to eek out all the possible range you’ll need to set your devices to operate on only one channel - this is a move that doesn’t align well with the duty cycle rules of LoRaWAN. With that in mind people should be considerate of how they use our shared radio bandwidth.

    However you can still post received messages to public networks like The Things Network (the Internet, being hardwired, has plenty of bandwidth). Additionally the gateway code can make use of Channel Activity Detection (CAD). CAD makes an attempt to listen for packets on all channels and quickly switch to that channel to receive the data. Tradeoffs will be decreased sensitivity and potentially more frequent packet misses.

    Thank you for bringing this up!

  • That’s a good question. As of right now we aren’t working on a full gateway because there are several good solutions already available (I’ll list them below). However if there’s a need that we are not aware of please let us know and we might be interested in coming up with a solution. What would you want from a SparkFun (fully capable) LoRa gateway? Thanks!

    Here are some gateway options:

  • Thanks for spotting that, I have just updated the Features tab to include my current measurements for a few different modes/phases of operation. Hope that helps!

No public wish lists :(