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Sound Detector Hookup Guide

Introduction

The Sound Detector is a small board that combines a microphone and some processing circuitry. It provides not
only an audio output, but also a binary indication of the presence of sound, and an analog representation of it’s
amplitude.

SparkFun Sound Detector

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SEN-12642

Summary of Contents for SEN-12642

Page 1: ...tector is a small board that combines a microphone and some processing circuitry It provides not only an audio output but also a binary indication of the presence of sound and an analog representation...

Page 2: ...it Suggested Reading How to Use a Breadboard Analog vs Digital The Wikipedia article on sound Quick Start To get started with the Sound Detector simply connect it to a power supply Sound Detector Powe...

Page 3: ...ow the sound detector responds to a series of sound pulses Sample Sound Detector Output This shows the output voltages over time The dark green trace is the audio output of the sound detector The audi...

Page 4: ...ding a DC offset of approximately the supply voltage The output from the capsule is an extremely small voltage so the signal from the capsule is amplified by IC1G1 an operational amplifier stage By de...

Page 5: ...switch on than to switch off This allows it to ignore some ripple in the input signal like the ripple present in the output of the envelope follower stage The output of the Schmitt trigger is found on...

Page 6: ...pply is by checking it with an oscilloscope or volt meter set to the AC Volts or if provided the AC millivolts range A truly clean supply will show 0 000 VAC Based on the supplies used in testing ripp...

Page 7: ...g or undesirable To disable it simply use a solder sucker or wick to remove the solder blob from the jumper near the LED Physical Considerations The electret capsule on the Sound Detector is also sens...

Page 8: ...ht Angle PRT 00553 A row of right angle male headers break to fit 40 pins that can be cut to any size Used with custom PCBs or gen Jumper Wires Premium 12 M F Pack of 10 PRT 09385 This is a SparkFun e...

Page 9: ...e to rises to indicate the amplitude of the sound is sampled in the loop and it prints an indication of the level to the serial terminal For more details about the Sound Detector please check the hook...

Page 10: ...o interrupt pinMode PIN_GATE_IN INPUT attachInterrupt IRQ_GATE_IN soundISR CHANGE Display status Serial println Initialized void loop int value Check the envelope input value analogRead PIN_ANALOG_IN...

Page 11: ...LM3916 VU Taper COM 12695 This is the LM3916 Dot Bar display analog controlled LED driver that uses a more logarithmic VU scale which mak 2 Electrolytic Decoupling Capacitors 10uF 25V COM 00523 Low p...

Page 12: ...5V for the Sound Detector The 5V is connected to the rail at the top of the breadboard It is used to power the Sound Detector and as the anode supply for the LEDs The 13V is on the lower rail and is t...

Page 13: ...are being picked up If the audio output is distorted the gain may need to be reduced If the audio output is really quiet the gain may need to be increased If there is a constant tone on the audio out...

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