Noisebell

Monitors the door at Noisebridge and tells you whether it's open or closed.

A Raspberry Pi reads a magnetic sensor on the door and pushes state changes to a cache server. The cache keeps the latest state and fans updates out to chat integrations such as Discord and Zulip.

Pi (door sensor) ──webhook──> Cache ──webhook──> Discord / Zulip
                                |
                     polls Pi <-+
                                |
                                +──webhook──> Pi relay ──webhook──> Home Assistant

Layout

Directory	What it is
pi/	Raspberry Pi OS base with laptop-built Noisebell deploy
remote/	Server-side services (cache, RSS, Discord, Zulip)
hosts/noisebell-do/	Standalone DigitalOcean NixOS host for the remote services
secrets/	Shared agenix-encrypted secrets and recipient rules

Each directory has its own README with setup and configuration details.

For hosted deployment, this repo exports nixosConfigurations.noisebell-do, a small DigitalOcean NixOS host that imports noisebell.nixosModules.default. The host provides deployment-specific values like domains and the Pi address, while the Noisebell module itself points agenix at the encrypted files in secrets/ and consumes the decrypted runtime files on the target machine.

Useful commands:

• ./scripts/deploy-do [jet@noisebell-do] redeploys the DigitalOcean remote host
• ./scripts/nhs redeploys the old Hetzner host using the local checkout as the flake input
• scripts/deploy-pios-pi.sh pi@100.66.45.36 redeploys the Raspberry Pi OS machine

The full Home Assistant relay workflow is documented in pi/README.md.