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Gyro & Acceleration Sensors
MPU-9150. All in one kit. Gyro, Acceleration and Compass.
Links: Amazon: http://www.amazon.de/GY-9150-MPU-9150-Achsen-Kompass-Accelerometer-SE05014/dp/B00VRJEA7C/ref=sr_1_1?ie=UTF8&qid=1430578388&sr=8-1&keywords=MPU-9150
http://www.invensense.com/mems/gyro/documents/PS-MPU-9150A-00v4_3.pdf
Proximity Sensors
4-Pin Ultrasonic-Module HC-SR04
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