The Sound Detection Module Sensor picks up ambient sound through an onboard electret microphone and processes it through the LM393 comparator IC, outputting a digital signal on the DO pin when sound crosses the threshold. The sound sensor runs on 3.3V to 5V DC with an induction distance of 0.5 metre, making it suitable for close-range clap detection and sound-activated triggering.
The sound detection sensor also provides an analog output on the AO pin that reflects raw microphone amplitude. A non-obvious limitation is that the sensitivity potentiometer on the board sets a fixed comparator threshold. In noisy environments the digital output triggers continuously, making it unreliable without software debouncing. The LM393 output is open-collector, so a pull-up resistor on DO is needed for a stable HIGH state.
Students and automation builders use the sound sensor arduino connection with digitalRead on DO or analogRead on AO. StemVolt ships this module ready to plug into a breadboard immediately.
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Features:
- Induction distance of 0.5 metre covers desk-range sound triggering without external amplification
- Both digital DO and analog AO outputs available on the same compact 4-pin header
- 4-pin interface with AO G plus and DO connects without breadboard adapters
Technical specifications:
| Specification | Details |
|---|---|
| Operating Voltage | 3.3V to 5V |
| IC Chip | LM393 |
| Output Signal | Digital and Analog Output |
| Induction Distance | 0.5 Meter |
| PINs | AO, G, +, DO |
Applications:
- Clap-activated smart light uses Sound Detection Module Sensor to toggle relay on double clap
- Classroom noise level indicator uses analog AO output to display sound amplitude on an OLED screen
- Security system uses sound sensor arduino connection to detect glass breaking within 0.5 metre range
Package includes:
- 1 x Sound Detection Module Sensor
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