Figure 01
AVR based pedometer! –

A pedometer is a device that counts the number of steps taken by a person and calculates the distance traveled by multiplying the number of steps by the length of the step. Here’s a design solution for building a pedometer using the AVR MCU. The circuit not only combines all of the features of the traditional pedometer, it saves power (low power consumption is a must for a portable device) as well. The design also includes instantaneous speed measurement.

Power-Saving pedometer also measures speed – [via] Link.