# using 25 accelerometers with an arduino board

Hi

I am trying to use 25 accelerometers with an arduino uno board in order to receive the 25 individual streams of x y and z values into a arduino/processing sketch for visulizations. Could someone give me some feedback on a simple way of connecting this up so that it will feed through one arduino board.

Thanks

Devin J

What kind of accelerometers?

What kind of sample rate you looking for?

What kind of accuracy do you need?

Assuming some small voltage analog outputs at a very slow rate with only moderate accuracy you could use something like sparkfun's analog switch multiplexer.

But I have to ask, why do you need 25 (wait, 3 dimensions times 25) 75 accelerometers into one board?[/edit]

The sample rate needs to fairly rapid, so that I can predict the coordinates of the accelerometer's position in space (i.e. so that i can map them as point in space, in realtime). I will most likely put in a button on the board to normalize the entire set of accelerometer's in the beginning so that they have a determined starting position.

The accuracy can be fairly low, but then I would like to eventually build up the accuracy to something more accurate (sorry for the 'lack' of accuracy in this description, I'm new to the accelerometer sensor so i am still trying to figure out how the accuracy is calculated and its specific impact to my application).

Just to clarify, I am going to use 25 physical accelerometers and then each one has outputs for the x y and z directions, so there would be 75 values totals.

I am using these 25 accelerometers to create a 5 x 5 grid of points (the accelerometers) which I will feed their output coordinates into a arduino/processing sketch to determine all 25 points in space and then create simple NURBS curves from the points and loft the NURBS curves into NURBS surfaces to generate a realtime visualization of a NURBS surface.

thank you for the help i hope this helps to clarify

devin

'fairly rapid' ? I'd estimate about 60Hz across all 75 channels, that's 9000 bytes per second, so a minimum bit rate of 115200, and that is transmitting just the binary values.