Because I like your instructables and you followed me.

There is no program any;ore. I lost it due to a computer crash and I never wrote a new one.

The quartz crystal is 32768Hz one as specified in the datasheet of the DS1307

Hi winsdream,

I did use 7 stepper motors so 1 for each drum. Those are 15step stepper motors but you can use motors with more steps.

To contole the speed, I used 7 L293D-ic's (so one for each motor) in combination with the microcontroller. The microcontroller sends pulses to the L293D-ic and that one makes the motor spin 1 step for each pulse. THe delay time between the pulses is with a simple wait statement in the program.

You can connect the steppers directly to a microcontroller but there are some problems with that:

1) you won't have enough pins
2) the output of your microcontroller is not high enough (only 5V and a few mA) so you need something to get them to 12V and a reasonable amount of Amps.

So the easiest way I figured out was to use the 74HCT238 to select the motor (it only need 3 pins for 8 motors) and the L293D as the motor driver so that the motor runs on 12V

It costed me about 40Euro so thats not very expensive.