hi,

for a science project, my son and i want to see what effects a low voltage will have on a goldfish. NOTE: this is LOW voltage and current, so no fish will be injured! i am using a simple voltage divider ckt to get 5.0V supply down below 1.0V steadystate.

my question is: how can i generate a low voltage that "flutters" off and on from a PIC pin? i'm guessing just do a PWM or SOUND output off the pin with another voltage divider? target voltage is 0.5 to 1.0V to keep it simple.

oh, and it must work underwater ;-)

any inputs are appreciated!

thanks
Pat