Solarpunk technology

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License Free, Encrypted, Off-Grid, Decentralized Mesh Network Comms: A full guide on how to get started with LoRa devices and Meshtastic (adrelien.com)

submitted 6 months ago* (last edited 6 months ago) by ProdigalFrog@slrpnk.net to c/technology@slrpnk.net

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This seems like a great technology to build resiliency and redundancy in a community, especially for places where cell service is spotty, or in the odd event where normal lines of communication are blocked.

The LoRa boards can be easily powered with a small solar panel for continuous use, and if put in a high enough place with a good antenna, they can have a surprisingly long range!

In addition to being genuinely useful, they also seem like they'd be a lot of fun to experiment and play around with, printing cool 3D cases for them, or designing a better antenna or repeater setup.

If and of you already have experience with LoRa, I'd be interested to hear your thoughts! :D

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[–] McFarius@lemmy.world 10 points 6 months ago (3 children)

I have a question about how easy the signal is to block. I live in a somewhat mountains, densely forested area. Do devices need to have direct line or sight to communicate? Wanted to set this up as a potential back up communication source for grid outages and keep a device in each car.

[–] perestroika@slrpnk.net 11 points 6 months ago* (last edited 6 months ago) (1 children)

I played the idea a few years back, at some anarchist-leaning not-just-music festival. We tried setting up a link over a 70 m hill, both stations using 433 MHz (500 mW transmit power, quarter wave antennas) narrowband (no frequency hopping) LoRa boards from Chengdu EByte. Stick antennas, not directional. Both stations were right below the hillside, so the hill formed a perfect obstacle between them.

Communicating over the hill in a single hop proved impossible. With a repeater at the hilltop, it was possible to make contact with the repeater from street level (no line of sight, trees obstructing), but the repeater (Meshtastic didn't exist back then, it was entirely homebrew) had software bugs, so - no link to the other hillside. :)

With better software and better planning, the experiment would have succeeded. :) And if we'd have tried building a link over a valley, it would have been considerably easier.

With ordinary WiFi and directional antennas (panel or ladder antennas), I've been able to establish links over 1 km. If one used a LoRa card, and had a directional antenna for the frequency involved, in clear line of sight, I believe 10 km would be attainable without being a radio specialist.

[–] toaster@slrpnk.net 4 points 6 months ago

The antenna makes a huge difference too. With a $20 fibreglass 3dBi omnidirectional antenna that was only 26cm long, I was able to exceed 4km in a city with no line of sight. There were probably a ton of firmware and software improvements since you tried though, to be fair.

[–] jared@mander.xyz 10 points 6 months ago (1 children)

You'd really have to test it, it's a lower frequency (915mhz in US) so it should go much further than WiFi. Many people are putting them on roofs and in trees to get better range and then there's a whole world of antennas.

[–] McFarius@lemmy.world 3 points 6 months ago (2 children)

But when we're talking antennas, do I need to get a big one that I need to try and get above the tree line, or does it boost signal penetration?

[–] toaster@slrpnk.net 4 points 6 months ago

You don't need to, though the higher up the better since you get better line of sight. You can get several kilometres with a cheap antenna that is better than stock.

[–] rob@mastodon.nz 3 points 6 months ago

@McFarius @jared So many innuendoes, I hardly know where to start.