On Thu, 21 Oct 2010 22:01:15 -0700 Youda He wrote: > Hi, >=20 > What are the good ways to secure the modules and circuit board that > can sustain the vibrations? >=20 Hello, I came a bit late to the discussion, but I believe your largest concern may actually be resonance. We did some development of board, and put them on a vibrator table with accelerometers in several points... We were dismayed that at some points we measured 200G, with a sine excitation of only a fraction of a g... I believe the secret is lowering the Q factor of the board, maybe with some conformal coating. Else, components jump out of through-holes ;-) John --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .