Come in here, dear boy, have a cigar, you’re gonna go far.
–Pink Floyd, “Have A Cigar”
You’re gonna fly high, you’re never gonna die,
You’re gonna make it if you try, they’re gonna love you.
I’m not sure exactly what triggered it, but recently mesh networking came into my radar and I started researching it a bit. If you don’t know, it’s where people use small radios called LoRa (for Long Range) that operate on unlicensed frequencies – in the US it’s in the 915MHz area, same as many weather stations and other low bandwidth wireless devices – and they create a mesh network out of them. What’s a mesh network? One that is created “ad-hoc” or as needed, based on the neighbors in the area. So if it’s just you and a friend, you have a network of two devices. But if a third comes nearby, then it will join and they’ll repeat messages to each other. As others join, they become part of it, hearing neighbors and routing packets around to keep in touch. And if someone strays further from the others, then they’ll still be connected by whomever is closest. This is a bit of a generalization, but I think you get the idea; and the neat thing is how automatic it all is.
There’s two main systems at use right now, and Meshtastic is the one that was around first and seems more popular. It has downsides that the competition aims to solve, but overall it’s a very robust system for creating an ad-hoc link between people. MeshCore is the main competing system, and where Meshtastic is very freeform, MeshCore aims to create more of an infrastructure – client nodes don’t repeat what they hear in the same way, instead expecting a repeater that is higher up and in a better position to be doing it (which means if you don’t have one, you need to make one). MeshCore appeals to my networking and emergency management brain, and I want to set up some gear to join that at home, but Meshtastic I think is going to solve a more immediate problem, namely that of communication during things like scout events when not everyone is licensed for amateur radio operation and so I can’t just hand out HTs to people. But if you’ve got a device that speaks Bluetooth, I can hand over a small card and you can pair your device to it, even if it doesn’t have cell service, and we can communicate. Some of the devices are completely standalone and don’t even require another device, though unless it’s one of the more expensive ones that look like a Blackberry the method for typing messages is a bit archaic (not quite the level of T9 texting, but not far off).
And the best thing about these devices? They’re extremely inexpensive. You can get a simple LoRa device for Meshtastic use for even $10. Of course you’ll want a better antenna, and maybe a battery, a nicer case, so prices go up from there. But you can even buy a complete device for $40 – compared to a decent HT for amateur use which usually starts around $90 if you’re not looking at the “cheap” radios. I got a Seeed Studio Wio Tracker L1 Pro, and while I was waiting for it to arrive I picked up a Heltec v3 as well. I’ve been using the Wio like a “home repeater” so I can get out further, but will be picking up a node to mount outdoor next month. Seeed Studio also makes the SenseCAP Solar Node P1-Pro which is a self-contained solar unit, and though there’s plenty of plans online for building such things, since I don’t have components on hand to use to make it the Seeed Studio unit works out cheaper than I could buy all the pieces and put it together myself. Combine that with a handful of the T1000-E cards for personal carry and the whole family will have a way to communicate that doesn’t involve cell service or any infrastructure, and I won’t get funny looks when I suggest we use handheld radios for things (since 2/5 of the family don’t have a license anyway, and the others often don’t want to carry a radio with them for most outings).
Oh, and don’t think this means I’m giving up on getting people interested in radio, like the scouts and such. It just means I have an easier inroad to getting them hooked on the fun of it 😀








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