The modes and several parameters of the
accelerometer are set by programming the SD card using
an Excel spreadsheet. Make sure you have the right
spreadsheet. There are two: one for 2-16 gs and the other
for 100 gs-400 gs.
Using your computer, format an SD card from
256 MB up to 2.0 GB using Fat 32. We are now going to
set the time in the microprocessor’s clock. (NOTE: If the
power is turned off, the micro’s clock will be lost.)
Download the Excel sheet titled “Accelerometer
Programming 2g-16g” or “Accelerometer Programming
100g-400g.” Follow the directions in the spreadsheet. The
time is written to the SD card using a BCD format in
hexadecimal code. Ten six-bytes of code in one long
statement are stored in time.txt. Make sure you pre-program the time ahead to allow enough time to place
the card into the unit.
Seismic
Detector
In the Excel spreadsheet, type
in an x next to Seismograph. Load
the card and turn on the unit. The
LED should be red. Watch the
clock, and when it reaches the
proper minute, press switch 1 and
release. The LED should flash green,
indicating that the micro’s clock has
been set to the time you
programmed on the SD card.
Once you have located the
area where you are going to place
the seismograph, you can activate it
by pushing the switch. The LED will
turn on steady red for one minute.
This will allow you to put the lens
on and secure it with the knurled
nuts. When the red LED goes out, it
indicates that it is armed.
When the unit is jarred or an
earthquake happens, the data will
be written to the SD card and the
LED will turn green, indicating that
it is making a measurement. Once
the unit has made a one minute
measurement, the LED will flash red
about every four seconds, indicating
that an earthquake (or event) has
occurred.
When you are ready to read
the data, remove the lens (this will
activate the unit and record the
jarring from the removal, but will
also end up as an invalid txt file).
Turn the power off and remove the
SD chip.
Continuous
Monitoring
In the Excel spreadsheet, type
in an x next to Continuous Monitor
and load the card. Turn on the unit;
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38 November 2014
