The Grove - 3-Axis Digital Accelerometer ±16g Ultra-low Power (BMA400) sensor is a 12 bit, digital, triaxial acceleration sensor with smart on-chip motion and position-triggered interrupt features. It can detect your movement posture, such as Walking, Running, Standing still.

Ultra-low power
Programmable functionality
On-chip FIFO
On-chip interrupt features
Auto-low power/Auto wakeup
Activity/In-activity
Step counter
Activity Recognition(Walking,Running,Standing still)
Orientation detection
Tap/Double tap
Typical applications
Step Counting with ultra-low current consumption for extensive battery lifetime
Fitness applications / Activity Tracking
Tap / double tap sensing
Drop detection for warranty logging
Window/door measurements for climate control and alarm systems