Subject
4 entries
Sensors
Bookmarks
Quaternion: 3D Rotation for Quantified Self Data
Tweet from SFDataScience meetup about quaternions as the right representation for 3D rotation data from phone accelerometers/gyroscopes. Quaternions avoid gimbal lock and enable smooth interpolation — more practical than rotation matrices for sensor fusion.
Indoor Navigation Using Disruption of Earth's Geomagnetic Field
IndoorAtlas (2012) used disruptions in Earth's magnetic field caused by building steel to create indoor positioning — no GPS, no beacons, no special hardware required. A clever exploitation of a physical property buildings already have.
Cosm: Internet of Things Platform
Cosm (formerly Pachube, later renamed Xively) was a cloud platform for connecting and sharing real-time sensor data from physical devices — one of the earliest Internet of Things platforms. It predated AWS IoT by years and pioneered the model of device-to-cloud data streams with public APIs.
Bitponics: Automated Gardening for Brown-Thumbed Plant Killers
Bitponics was an Arduino-based automated gardening system that monitored pH, temperature, light, and humidity and sent alerts when plants needed attention. An early consumer IoT product applying sensor networks to home horticulture.