Sensors

Accelerometers, Gyroscopes, Temperature Sensors, Pressure Sensors, ...

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gas sensor

• MiCS 4514 CO and NOx sensor

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accelerometer

• Accelerometer 101: Understanding the Nike iPod Sport Kit Sensor

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magnetic field sensor

• Hall effect sensor

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Further reading

• WSN:Sensors
• Interfacing with Hardware See the section on "Input" Writtern for the arduino but usefull just for the info on sensors.