CPS-Lab*
lab 6
Dependencies: ADXL362 mbed MPL3115A2
report.txt@12:c6b056ad171e, 2018-02-22 (annotated)
- Committer:
- htdoughe
- Date:
- Thu Feb 22 21:29:19 2018 +0000
- Revision:
- 12:c6b056ad171e
- Child:
- 29:f328fa35e8eb
documentation written for virbration detection
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| htdoughe | 12:c6b056ad171e | 1 | # Documentation for Vibration Detection |
| htdoughe | 12:c6b056ad171e | 2 | |
| htdoughe | 12:c6b056ad171e | 3 | Our algorithm is fairly simple right now; it measures knocks by comparing x, y, and z |
| htdoughe | 12:c6b056ad171e | 4 | values to an initial baseline set of values. When the program starts, it saves |
| htdoughe | 12:c6b056ad171e | 5 | initx, inity, and initz (uint8_t values); these are the initial baseline values for |
| htdoughe | 12:c6b056ad171e | 6 | each axis of measurement for the accelerometer. The program then enters a |
| htdoughe | 12:c6b056ad171e | 7 | perpetual while loop that measures x, y, and z and compares those new measurements |
| htdoughe | 12:c6b056ad171e | 8 | to their respective initial values. If any of these measured values vary from their |
| htdoughe | 12:c6b056ad171e | 9 | initial values by more than 2 (in either a positive or negative direction), the |
| htdoughe | 12:c6b056ad171e | 10 | LED lights for 2 seconds and measurement pauses. After those 2 seconds, measurement |
| htdoughe | 12:c6b056ad171e | 11 | resumes. |
| htdoughe | 12:c6b056ad171e | 12 | |
| htdoughe | 12:c6b056ad171e | 13 | This algorithm assumes 2 main things about the evironment: that any knock is |
| htdoughe | 12:c6b056ad171e | 14 | significant enough to change the measured value from the initial value by at least 3, |
| htdoughe | 12:c6b056ad171e | 15 | and that the baseline does not change (that is, that the board's orientation is fixed |
| htdoughe | 12:c6b056ad171e | 16 | during program execution). |