how to calculate exact foot step count using accelerometer in android?

Question

I am developing some application like Runtastic Pedometer using the algorithm but I am not getting any similarity between the results.

my code is as follows:

Answer 1

I am using step detection in my walking instrument. I get nice results of step detection. I use achartengine to plot accelerometer data. Take a look here. What I do:

1. Analysis of magnitude vector for accelerometer sensor.
2. Setting a changeable threshold level. When signal from accelerometer is above it I count it as a step.
3. Setting the time of inactive state (for step detection) after first crossing of the threshold.

Point 3. is calculated:

• arbitrary setting the maximum tempo of our walking (e.g. 120bpm)
• if 60bpm - 1000msec per step, then 120bpm - 500msec per step
• accelerometer passes data with certain desired frequency (SENSOR_DELAY_NORMAL, SENSOR_DELAY_GAME, etc.). When DELAY_GAME: T ~= 20ms (this is included in Android documentation)
• n - samples to omit (after passing the threshold)
• n = 500msec / T
• n = 500 / 20 = 25 (plenty of them. You can adjust this value).
• after that, the threshold becomes active.

Take a look at this picture: