I made a small prototyping board where accelerometer data is read into a microprocessor, showing the data from the accelerometer after it is sampled, gives a very noisy signal. (50 mv peaks)
I had a similar problem before on a breadboard and switched to another breadboard/layout to resolve this but sadly didn't think any more of it. I think the problem is do to interference from the 5v power regulator or bluetooth module, however when using a oscilloscope I can't find the noisy signal anywhere on the board!
I would be greatly interested in any information which could lead me to find to source of the noise or solve it.
Edit1: The noise increases when the bluetooth module is sending data. So its almost certainly crosstalk or interference through gnd/vcc, any way to resolve this without resoldering?
Edit2: board layout http://imgur.com/bNLDdlz