Author Topic: Piezo Sound Sensor Switch  (Read 88 times)

istarion

  • Full Member
  • **
  • Posts: 30
    • View Profile
Piezo Sound Sensor Switch
« on: November 01, 2017, 11:30:25 PM »
I wound like to use a piezo sensor as a sound activated trigger switch and was hoping to get some advice on how to mount and wire this to my Core board. Thanks.

berk

  • Veteran
  • *****
  • Posts: 374
    • View Profile
    • funwithelectrons.blogspot.com
Re: Piezo Sound Sensor Switch
« Reply #1 on: November 02, 2017, 05:59:00 PM »
Not really feasible. Most piezo sensors work by producing a very small voltage. The CORE board expects a switch to pull the trigger pin to ground, so you'd have to:
1 Amplify the piezo output to a sufficient level to trigger a  NPN transistor.
2 Connect the collector of the transistor to the trigger input (NOT the 0V side!) on the CORE board.

The trouble with using sound is how loud a sound is needed to trigger it. What happens if you drop the gun, bang it against something or shout.

If this sounds like a lot of work, it is.