Converting a 12V trigger to signal ground

Thread Starter

stindig

Joined Apr 24, 2019
2
Hi

I am adding some security to my house by installing some intruder detection beams. The control device outputs a 4 second 12V signal when the beam is broken - so currently I can make a blue flashing light come on. However, I also want to play back an audio file with speech - something along the lines of "your presence has been detected and the police have been informed". The device at the link below looks ideal for this but needs a 'signal ground' trigger, rather than 12V. Can I convert 12V to signal ground? Is there a device to do this as my ability to build circuits is VERY limited?

Overview
https://learn.adafruit.com/adafruit-audio-fx-sound-board/overview
Triggering audio
https://learn.adafruit.com/adafruit-audio-fx-sound-board/triggering-audio

Any advice, very much appreciated.
 

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Picbuster

Joined Dec 2, 2013
1,020
use a mosfet to invert the input.
pull-up inside the soundboard will do the job clamp gate to gnd with a 47K resistor. ( to avoid floating when 12V is not connected)

Picbuster
 
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