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Show HN: Offline SOS signaling+recovery app for disasters/wars

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158 points nizarmah | 4 comments | 01 Apr 25 21:58 UTC | HN request time: 1.226s | source

A couple of months ago, I built this app to help identify people stuck under rubble.

First responders have awesome tools. But in tough situations, even common folks need to help.

After what happened in Myanmar, we need something like this that works properly.

It has only been tested in controlled environments. It can also be improved; I know BLE is not _that_ effective under rubble.

If you have any feedback or can contribute, don't hold back.

1. neuroelectron ◴[01 Apr 25 23:28 UTC] No.43552372[source]▶
Do smart phones support "LE Long Range (Coded PHY, S=8)" Perplexity says it can transmit up to a 1km in ideal conditions. Otherwise it's 10-30m indoor.
replies(2): >>43552401 #>>43553182 #
2. nizarmah ◴[01 Apr 25 23:35 UTC] No.43552401[source]▶
Receiving signals doesn't. Advertising likely does. So if someone has proper equipment, they probably can identify the signals.

Ideal conditions is likely open spaces with no interference. Walls and concrete lower that as you mentioned.

I'm hoping it can help if people are standing right next to the rubble, whether BLE or the "siren" sound.

I have no guarantees though. I haven't properly tested because I haven't thought of a low cost option yet.

replies(1): >>43553758 #
3. nizarmah ◴[02 Apr 25 02:30 UTC] No.43553182[source]▶
Hey neuroelectron! I'm sorry. I misunderstood your question, initially.

I don't know if phones support LE Long Range. I will look into it [1]. Thank you!!

[1]: https://github.com/nizarmah/igatha/issues/5

4. neuroelectron ◴[02 Apr 25 04:49 UTC] No.43553758[source]▶
I'm asking if smart phones support LE Long Range