Instructables

Mp3 doorbell

I'm trying to hook up a relay to the wires leading to a broken door chime in a way that when the button is pressed it causes the mp3 player to play an audio clip. what I need help on is the speaker, what I would like, is to have the speaker turn on when the button is pressed and to stay on for 5 or so seconds after the button is released. How would I do that?

Picture of Mp3 doorbell
aaronXtreme2 years ago
will my coby mp4 work
Jayefuu2 years ago
1) You could load the mp3 player with a 5 second track.
2) You could have the button trigger a 555 monostable which turns the speaker on for 5 seconds.
mh76dk2 years ago
Though i do not have much experience with them, a 555 timer (or one of its descendants) might be a way to go?

(if you search the web for 555 timer i am almost certain you can find a reasonably simple delay timer schematic)