ADXL345 accelerometer + Arduino and Processing language

[taoloo897]

Hello.

Please tell me if can i use this accelerometer with arduino mega 1280 or 2560 for calculate and display my car real speed.

Thank you very very much.

[MeLightk]

@taoloo897 You can not measure speed with an accelerometer. Accelerometer can only measure acceleration - acceleration is a change in speed. If your speed is constant, the accelerometer will show no data. Hope that helped

[TheIdeanator]

@taoloo897 yes you can, v = v0 + a * t

v = velocity in m/s, v0 is the starting velocity (v0 = v; at the end of the loop)

a = acceleration in m/s^2, you'll need to convert from G's to that

t = time in seconds, but only the interval between reads

[shebotnov]

thx for sharing!

[Ixanezis]

Thank you so much for the description in your blog!

It would take me ages to sort everything out by myself.

[luxsato]

Love the setup! I've got a question actually. Currently I'm using one of these for a project, and I don't really know how to interpret the values I read in. what is the output format of the accel. Like how can I take the resulting int from the two bits and convert to G's or is it already converted? Any help would be awesome

[MeLightk]

@luxsato I have a post describing the setup in details. The link is in the video description :) Send me a pm if you need further help