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Triggering 555 timer

  1. Feb 15, 2008 #1
    hey guys... i'm having some trouble trying to figure out how to trigger a siren i'm working on. i have an astable circuit setup with the output of the monostable 555 connected to the output of the astable 555s to trigger the circuit. i wanted to trigger the circuit using a PIC microprocessor but a teammate of mine says i can't do that. so far, the only way it's actually working is by grounding the trigger pin of the monostable 555. is there a chip or a circuit that i could add to this existing one that will be connected to the trigger pin of the monostable 555 and could have a signal sent to it by the PIC that will ground its output and thereby grounding the trigger pin of the monostable 555, which will get the result that i'm looking for?
  2. jcsd
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