Author Topic: ADXL345 spike value  (Read 1649 times)

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Offline eminemparkTopic starter

  • Newbie
  • Posts: 1
ADXL345 spike value
« on: May 16, 2013, 09:18:29 am »
I would like to ask why in the sensed data that I have, it has a spike value. For example:
(x y z)
(0.027 0.988 -0.113)
(0.035 0.988 -0.125)
(-2 0 -1.004)
(0.035 0.984 -0.125)
(0.035 0.984 -0.125)
For your information, i'm using accelerometer ADXL345 sensor. Why it can be happened? |O

Offline ConnorGames

  • Regular Contributor
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  • Posts: 97
Re: ADXL345 spike value
« Reply #1 on: May 16, 2013, 10:32:59 pm »
Do you have a scope? If so, check that the power supply and the i2c lines are nice and clean. I have also found these chips quite sensitive to inadequate decoupling. Make sure there is at least a few uF of ceramic capacitance as close as possible to the supply pins. On my 9dof stick from sparkfun, adding a 10uf ceramic in parallel with the existing .1uF dropped the noise floor to 1/4 of it's previous value.

I am assuming the code you are using is not at fault, but make sure to try some example code from the web if you are not doing so already.

Good luck!

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