Making sense of Pebble's Accelerometer byte[ ] array

Question

I'm using DataLogging service to log the raw accelerometer reading from pebble and retrieve these as byte array on my android. Just not sure how to interpret it based on the AccelData struct (x, y, z, did_vibrate boolean, time stamp). Here is a byte array string sample:

[-112, -1, 32, -1, 88, -4, 0, 95, -73, -62, -106, 68, 1, 0, 0]

(sampling with 10Hz and 10 samples per update)

Thanks.

score 0 · Accepted Answer · answered Mar 06 '14 at 15:23

0

isVibrate is 1 byte (bool)

timestamp is 8 bytes (uint64)

x, y, z are each 2 bytes (int16)

it looks like the data in your array is in reverse order of the struct definition. depending on what language you are coding in, the routine to convert these bytes into useable numbers will be different...

answered Mar 06 '14 at 15:23

Robert Levy

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it's little endian. so does that explain the reverse order? – jerrytouille Mar 07 '14 at 05:22

Making sense of Pebble's Accelerometer byte[ ] array

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