>Hi
>Same here - i have always wanted to do this but never known how.  The casio
>watches that act as remotes can learn and are great at annoying sales
>assistants in shops but even better would be a pic which could learn and
>randomly repeat commands.  It could even sit on the windowsill outside -
>they would never know what had happened.

And they would be so useful to car thieves too. Just replace the IR diode
with a radio tx/rx and they will unlock all the cars in the area too. Hmm..
perhaps not such a good idea.

On the rocketry project just a couple of thoughts. Firstly add a hall effect
switch which detects the launch, otherwise you might log several seconds of
nothing happening due to electrical noise.

Secondly the tough bit is finding sensors which are small and light enough.
Acceleration is not so tough, a beam with a pair of strain gauges would
probably work, but a precision pressure sensor is more difficult.

Storing the data should be no problem, an EEPROM should be suitable, and
small enough. I guess a surface mounting 16C7x would be a good choice of
processor, the 16C73 has a UART built in which makes downloading data
easier. However if you are willing to bit-bang your serial data out you
might be able to manage with a 16F85 or similar.

Just a few thoughts,

Keith.
==========================================================
Keith Dowsett         "Variables won't; constants aren't."

E-mail: kdowsett@rpms.ac.uk
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