I am working on a project to convert a self-contained amplified MP3 player to use as a doorbell. I have almost solved most of the problems ie how to get it to turn off after a set period.
All I need to do now is work out how to get it to operate from a wireless doorbell switch instead of a conventional one. The switch would need to replicate the operation of a momentary-on doorbell switch if you see what I mean.
Does anyone know a good way to do this reliably? perhaps by hacking another wireless doorbell??
Using another wireless doorbell would probably be the easiest way. Broadly speaking, the chime speaker could be removed and the signal used to trigger th e base of a transistor, which would trigger a 555 based timer which will operate as long as you wish your MP3 to play.
cordless switch
Posted - Feb 16 2012 : 04:48:03 AM
