hasnt got much to do with electronics....take a look.

[spice]

Does anyone know how this works:
**broken link removed**

im not sure how the completion of the timer rotation sets off the spring...

 

[spice]

URGENT!!!

 

[kitedude]

i think they just run on a timer nad the lid opens at a desired time to fed the animals.

so if your going away for the day, and wont be home to fed the pets, you can set the lid to open at 6.