When you don't have a steady cellular signal or immediate Wi-Fi access but need to communicate with others around you, you can set up an off-the-grid voice communications network using a Raspberry Pi and an Android app.
There are apps such as Bridgefy that will create a mesh network to communicate with other devices over Bluetooth. Still, when you're traveling in a convoy and want to message people in other vehicles, all the metal will make that nearly impossible. Even in situations where you're outside, but there are a lot of obstructions to block a Bluetooth signal, you're better off using something else.
In cases where a hotspot router won't be powerful enough to connect everyone, a Raspberry Pi with a decent wireless network adapter can help. With that and a PirateBox server running on it, you'll be able to anonymously share images, videos, audio files, documents, voice communications, and other content, as long as everyone is connected to its Wi-Fi hotspot.
With protests happening all over the world, law enforcement in some areas may try to disable cellular connections in the area to prevent demonstrators from talking with each other. The demonstrations in the US over police brutality and systemic racism are gripping the entire nation, and it's possible that mobile communications can be bogged down or blocked. Our wireless project here, a sort of Wi-Fi-based walkie-talkie system, can help with that, enabling everyone to alert each other of vital news, all connected to your Wi-Fi source.
What You'll Need
build voice communication system android raspberry
