documentation v1.0

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Copyright © Parallax Inc. Sound Impact Sensor (#29132) v1.0 10/27/2009 Page 1 of 2
Sound Impact Sensor (#29132)
The Sound Impact Sensor provides a means to add noise control to your project and responds to loud
noises such as a clap of the hands. Through the on-board microphone, this sensor detects changes in
decibel level, which triggers a high pulse to be sent through the signal pin of the sensor. This change
can be read by an I/O pin of any Parallax microcontroller.
Features
y
Detection range up to 3 meters away
y On-board potentiometer provides an
adjustable range of detection
y Single bit active-high output
y 3-pin SIP header ready for breadboard or
through-hole projects
y Built-in series resistor for compatibility with the
Propeller microcontroller and other 3.3 V devices
Key Specifications
y
Power requirements: 5 VDC
y Communication: Single bit high/low output
y Operating temperature: 32 to 158 °F (0 to +70 °C)
y Dimensions: 0.6 x 1.5 in (1.5 x 3.8 cm)
Application Ideas
y
Noise Activated Alarm Systems
y Holiday Animated Props
y Robotic Control
Pin Definitions
Pin Name Function
1 GND
Ground
2 5V 5 VDC
3 SIG Signal Pin
Connection Diagrams
For use with the included sample programs on page 2.
Sensitivity
The Sound Impact Sensor has a maximum detection range of 3 meters. However, if you plan to use this
sensor in an area where environmental factors can trigger false readings, the range can be shortened by
adjusting the potentiometer on the front of the board.