# HELP - Connect a piezo sensor board to audio-jack

**URL:** <https://forum.arduino.cc/t/help-connect-a-piezo-sensor-board-to-audio-jack/183217>\
**Category:** Sensors\
**Created:** [September 13, 2013, 5:13pm UTC](https://forum.arduino.cc/t/help-connect-a-piezo-sensor-board-to-audio-jack/183217 "2013-09-13T17:13:24Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [September 13, 2013, 5:13pm UTC](https://forum.arduino.cc/t/help-connect-a-piezo-sensor-board-to-audio-jack/183217/1 "2013-09-13T17:13:24Z")

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Hi,

I’ll like to connect the “Grove - Piezo Vibration Sensor” to an audio-jack, but I have some doubts about the connections.

"Grove - Piezo Vibration Sensor" connections : OUT; VCC; GND

OUT -\> audio-jack (+)  
? -\> audio-jack (-)

VCC -\> arduino (5V)  
GND -\> arduino (gnd)

How I make the ? (gnd) connection to the audio-jack (-) ?  
(from a gnd of the arduino?)

[http://www.seeedstudio.com/depot/grove-piezo-vibration-sensor-p-1411.html?cPath=25\_26](http://www.seeedstudio.com/depot/grove-piezo-vibration-sensor-p-1411.html?cPath=25_26)  
[http://www.seeedstudio.com/wiki/Grove-\_Piezo\_Vibration\_Sensor](http://www.seeedstudio.com/wiki/Grove-_Piezo_Vibration_Sensor)

thanks,  
Carlos Esteves

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<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 6, 2021, 10:02am UTC](https://forum.arduino.cc/t/help-connect-a-piezo-sensor-board-to-audio-jack/183217/2 "2021-05-06T10:02:39Z")

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