Abusing phones to make the internet of things
summary
A Firefox OS handset stripped to its board runs Gecko and Javascript so a $25 phone becomes a sensor-packed IoT node; JanOs is a single HTML file that exposes camera, SIM and Bluetooth and debugs via Firefox tools. The demo builds: a camera-based security cam (photos every 3s, saved to onboard storage), a Bluetooth doorbell (8 lines to trigger sound), and a BrianTracker that reports GPS over 2G and runs for two weeks on a default battery; flashing and WiFi quirks are documented.
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