Hi,

2nd Idea :

" My room mates never flush the toilet and no matter how much I yell at them
they still do not flush the toilet."

Is it really their duty to do that ...


Now, talking electronics ...

the "industrial" toilets flushers work like that ... and some I know ( mainly highway and hospital toilets ) use the 16F628 chip !!!

the only difference is commercial ones use an electro-valve.


Interesting point ...

Think to what happens if mains failure lasts a bit ...

Alain