freefall
This application demonstrates how to configure and use FreeFall feature. Two types of events are detected by the algorithm:
- LOW-G: aims at detecting when the device is free-falling (before the end of the fall).
- FREEFALL: aims at detecting when the device felt and hit the ground.
Terminal output
Data format
Data are printed on the terminal as follow:
<timestamp> us LOW_G
<timestamp> us FREEFALL length: <ff_length> cm (<ff_duration> ms)
With:
<timestamp>: Time in microsecond read from MCU clock when latest INT1 was fired.<ff_length>: Length of the FreeFall in centimeters, computed based on the number of samples.<ff_duration>: Duration of the FreeFall in milliseconds, computed based on the number of samples.
Example of output
[I] ###
[I] ### Example FreeFall
[I] ###
[I] 2030564 us LOW_G
[I] 2033061 us LOW_G
[I] 2035565 us LOW_G
[I] 2038070 us LOW_G
[I] 2040573 us LOW_G
[I] 2043077 us LOW_G
[I] 2045581 us LOW_G
[I] 2048084 us LOW_G
[I] 2050588 us LOW_G
[I] 2053092 us LOW_G
[I] 2055596 us LOW_G
[I] 2058099 us LOW_G
[I] 2060603 us LOW_G
[I] 2063106 us LOW_G
[I] 2065610 us LOW_G
[I] 2068115 us LOW_G
[I] 2070618 us LOW_G
[I] 2073122 us LOW_G
[I] 2075626 us LOW_G
[I] 2078131 us LOW_G
[I] 2080633 us LOW_G
[I] 2083137 us LOW_G
[I] 2085641 us LOW_G
[I] 2088145 us LOW_G
[I] 2090649 us LOW_G
[I] 2093153 us LOW_G
[I] 2095657 us LOW_G
[I] 2098162 us LOW_G
[I] 2100665 us LOW_G
[I] 2103168 us LOW_G
[I] 2105673 us LOW_G
[I] 2108176 us LOW_G
[I] 2110681 us LOW_G
[I] 2113184 us LOW_G
[I] 2115688 us LOW_G
[I] 2118191 us LOW_G
[I] 2120696 us LOW_G
[I] 2123200 us LOW_G
[I] 2125704 us LOW_G
[I] 2128208 us LOW_G
[I] 2130712 us LOW_G
[I] 2133216 us LOW_G
[I] 2135720 us LOW_G
[I] 2138224 us LOW_G
[I] 2140727 us LOW_G
[I] 2143231 us LOW_G
[I] 2145735 us LOW_G
[I] 2148239 us LOW_G
[I] 2150742 us LOW_G
[I] 2153247 us LOW_G
[I] 2155750 us LOW_G
[I] 2158254 us LOW_G
[I] 2160760 us LOW_G
[I] 2163262 us LOW_G
[I] 2170775 us LOW_G
[I] 2173278 us LOW_G
[I] 2175783 us LOW_G
[I] 2178287 us LOW_G
[I] 2180791 us LOW_G
[I] 2183295 us LOW_G
[I] 2185800 us LOW_G
[I] 2188303 us LOW_G
[I] 2190807 us LOW_G
[I] 2193311 us LOW_G
[I] 2195815 us LOW_G
[I] 2198320 us LOW_G
[I] 2215815 us FREEFALL length: 17.15 cm (75 ms)