In message <3427076C.AA7721BE@nb.net>, Pioneer Microsystems writes >Just a thought, which I am yanking out of the muck of my memory... I seem to >recall that ceramic disc capacitors can make a super cheap vibration sensor. I >think it was for bearing monitors or something. Also, you might craft a > resonant >sound chamber in the molding of the housing of the product for the piezo souning >disc. And if you don't use the PIC to oscillate the disc I'll be disapointed. >In other words, don't pay for the module with the oscillator that runs off of >DC. Why would you add cost when the PIC can take up the job? > >Chris Eddy >Pioneer Microsystems, Inc >www.nb.net/~ceddy > >Peter Baines wrote: > >> Hi all, >> I know this is Way off topic but can anybody give me some pointers to >> cheap accelerometers. I have an idea for a personal alarm using say 16c84 >> or sommit and a loud pizo sounder the accelerometer and a few push buttons. >> >> Oh BTW if anybody knows of any LOUD pizo sounders can you point me at them >> too >> >> Cheers Peter ......... I just put my 'scope across a piezo sounder, and found that I could get several volts out of it when I tapped it, with it resting on a hard surface. A 1n ceramic capacitor just produced a few mV, I couldn't measure it, but something was there, because it was triggering the 'scope. Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/rcm.htm for details of a low-cost reconfigurable computing module using the XC6216 FPGA