I finally finished the first of,what should become,a series of robots which have some kind of simple electronic circuit in them.This one has a 555 dark detecting circuit in it with a speaker and a variable resistor which allows you to set the sensitivity.It operates on a 3V coin cell and is not that loud.With 6 V it would probably sound a lot louder.
This is the circuit I used.It came from the free e-book:50 555 circuits by Colin Mitchell.
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