On 21/08/2007 mrbill2 wrote:

Hello Group
I need a schematic to control the speed and run time of a small 3
volt battery powered electric motor. Run time 5 to 30 seconds at
different speeds. Thanks
Mr. Bill

I'm afraid that a schematic won't control anything; you'll need to
build some hardware. But first you need to specify exactly what speeds
and how you want to select which running time and speed is used.

Once you've done that, it'll take no more than half an hour to get that
working with an ATmega48V which will run at 2.7V.

--
John B