CPS-Lab* / Mbed 2 deprecated lab6

lab 6

Dependencies:   ADXL362 mbed MPL3115A2

report.txt@29:f328fa35e8eb, 2018-03-08 (annotated)

Committer:
htdoughe
Date:
Thu Mar 08 21:18:29 2018 +0000
Revision:
29:f328fa35e8eb
Parent:
12:c6b056ad171e
Child:
30:9e127911409d
documentation of altimeter added to report.txt

Who changed what in which revision?

UserRevisionLine numberNew 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 29:f328fa35e8eb 16 during program execution).
htdoughe 29:f328fa35e8eb 17
htdoughe 29:f328fa35e8eb 18 # Documentation on Altimeter Measurement
htdoughe 29:f328fa35e8eb 19
htdoughe 29:f328fa35e8eb 20 Our altimeter code (measureAlt()) reports the atmospheric pressure in Pascals and
htdoughe 29:f328fa35e8eb 21 temperature in Celcius, retrieved from the appropriate registers at a rate of 10Hz.
htdoughe 29:f328fa35e8eb 22 The function saves the first 1000 measurements into an array of doubles (doubles being
htdoughe 29:f328fa35e8eb 23 the returned values of both our pressure and temperature measurements), arranged in
htdoughe 29:f328fa35e8eb 24 order of measurement. (data[0] is the first pressure measurement, data[1] the first
htdoughe 29:f328fa35e8eb 25 temperature measurement, data[2] is the second pressure measurement, and so on.)
htdoughe 29:f328fa35e8eb 26
htdoughe 29:f328fa35e8eb 27 If the buffer is filled or a keypress is registered from the PC, measureAlt() stops
htdoughe 29:f328fa35e8eb 28 measuring and shows a basic input prompt, "p%". If the interrupt was from a keypress,
htdoughe 29:f328fa35e8eb 29 the key pressed is echoed as well. If the user types 'p' and then 'enter', the
htdoughe 29:f328fa35e8eb 30 measurements taken are printed to the terminal in the following format:
htdoughe 29:f328fa35e8eb 31
htdoughe 29:f328fa35e8eb 32 %PRESSURE% %TEMPERATURE%\n\r
htdoughe 29:f328fa35e8eb 33
htdoughe 29:f328fa35e8eb 34 (Example actual output is shown below.)
htdoughe 29:f328fa35e8eb 35
htdoughe 29:f328fa35e8eb 36 Once the measured values have been printed, the function exits successfully.
htdoughe 29:f328fa35e8eb 37
htdoughe 29:f328fa35e8eb 38 #A note on our implementation
htdoughe 29:f328fa35e8eb 39 Currently, our code relies on being connected to a pc with a keyboard as it is
htdoughe 29:f328fa35e8eb 40 measuring values. This is a limitation of our code that we are attempting to
htdoughe 29:f328fa35e8eb 41 (and fully plan to) address.
htdoughe 29:f328fa35e8eb 42
htdoughe 29:f328fa35e8eb 43 Example output:
htdoughe 29:f328fa35e8eb 44
htdoughe 29:f328fa35e8eb 45 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 46 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 47 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 48 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 49 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 50 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 51 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 52 98763.000000 22.187500
htdoughe 29:f328fa35e8eb 53 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 54 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 55 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 56 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 57 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 58 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 59 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 60 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 61 98749.000000 22.062500
htdoughe 29:f328fa35e8eb 62 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 63 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 64 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 65 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 66 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 67 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 68 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 69 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 70 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 71 98797.000000 22.250000
htdoughe 29:f328fa35e8eb 72 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 73 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 74 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 75 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 76 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 77 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 78 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 79 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 80 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 81 98785.000000 22.125000
htdoughe 29:f328fa35e8eb 82 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 83 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 84 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 85 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 86 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 87 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 88 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 89 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 90 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 91 98794.000000 22.125000
htdoughe 29:f328fa35e8eb 92 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 93 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 94 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 95 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 96 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 97 98842.000000 22.250000
htdoughe 29:f328fa35e8eb 98 98842.000000 22.250000