21 Jan '15, 2pm

Full-Featured Pedometer Design Realized with 3-Axis Digital Accelerometer (2010)

The ADXL345 is an excellent accelerometer for pedometer applications. Taking advantage of its small, thin, 3-mm × 5-mm × 0.95-mm plastic package, pedometers using it can be found in medical instruments, as well as fancy consumer electronic devices. Its low 40-µA power requirement in measurement mode and 0.1 µA in standby mode make it an ideal choice for battery-powered products. Substantial savings in power result from the embedded FIFO, which minimizes the host processor's load. Also, the selectable output data rate can be used to save a timer in the processor. The 13-bit resolution makes it possible for small peak-to-peak changes to be detected, leading to the possibility of high-accuracy pedometers. Finally, combining the 3-axis output feature and the algorithm described above, users can wear the pedometer in just about any location and position.

Full article: http://www.analog.com/library/analogdialogue/archives/44-...

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