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Sound Sensor with Digital Trigger (3 pieces)

Sound Sensor with Digital Trigger (3 pieces)

Regular price $10.99
Regular price Sale price $10.99
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This product has tutorials here and here!


  • Sound sensor with digital trigger output.
  • Works with both 3.3V and 5V input voltage.
  • Adjustable sensitivity.
  • 3-pack.
  • PTSolns Customer Support – Your satisfaction matters to us. Please contact us for troubleshooting help or any other concerns you may have.


This sound sensor is easy to use and implement in many projects. The sensor has an adjustable trigger threshold. When the detected sound is below the threshold the digital out remains HIGH (1). With increasing sound, eventually surpassing the threshold, the digital out switches to LOW (0). By adjusting the onboard potentiometer this threshold can be tuned. Turn it all the way clockwise and the sensor becomes not sensitive at all, and will not trigger. Turn it all the way counterclockwise and the sensor becomes too sensitive and is triggered at all times.


Technical Specifications

  • Operating voltage: 3.3V - 5V
  • Adjustable sensitivity (threshold for triggering).
  • PCB dimensions: 32mm x 17mm (not considering angled male header pins)
  • Weight: 3.2g
  • Current consumption: See Table 1 below.
  • Onboard Power LED, and Trigger LED. See Fig. 1 below 


Table 1: Experimental values of sound sensor digital. CW = all the way Clockwise. CCW = all the way Counter-Clockwise

Fig. 1: Sound sensor digital. Explanation of onboard LEDs.

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Customer Reviews

Based on 1 review
Works perfectly in my Morse code ham radio project

I used the board with a relay, and other parts to connect Morse code software running on a Chromebook to my ham radio to send Morse code. Worked perfectly and was very inexpensive too.