Galaxy S4 Sensor Array: What can we build with it?
The Galaxy S4 contains a massive array of sensors: Compass (Magnetometer), Proximity, Ambient light, Gyroscope, Accelerometer, Barometer, Thermostat, Humidistat, Infrared. It's basically a simple mobile weather station! So we can build amazing weather maps. What else?
Can you map the Earth's magnetic field with a network of ten million S4s (plus so many other phones that have a compass)? What about an Infrared background map? Does that make sense?
What are your ideas?

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