Adafruit
Adafruit Silicon MEMS Microphone Breakout - SPW2430
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The Adafruit SPW2430 Silicon MEMS Microphone Breakout is a compact, low-cost microphone module that detects sound and converts it to an analog voltage — no e...
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The Adafruit SPW2430 Silicon MEMS Microphone Breakout is a compact, low-cost microphone module that detects sound and converts it to an analog voltage — no external bias resistor or amplifier needed. With a frequency range of 100 Hz to 10 kHz, it's well suited for general-purpose audio recording, detection, and sound-reactive projects.
The breakout provides both DC-coupled and AC-coupled outputs. The DC pin outputs the audio waveform with a 0.67 V bias (approximately 100 mVpp when speaking nearby, up to 1 Vpp for loud sounds). The AC pin includes a 10 µF series capacitor for equipment that requires AC-coupled audio input.
Key Features
- SPW2430 MEMS Microphone – Built-in amplifier, no external bias or preamp needed
- Frequency Range – 100 Hz to 10 kHz
- DC & AC Outputs – DC pin with 0.67 V bias for direct ADC connection; AC pin with capacitor coupling
- Output Level – ~100 mVpp typical speech, up to 1 Vpp for loud sounds (line-level compatible)
- 3.3–5 V Power – Onboard 3 V regulator; best performance on a quiet 3.3 V supply
- Compact Size – Minimal board with just the mic, regulator, and filter capacitors
Ideal For
- Audio-reactive projects using FFT
- Voice changers and audio recording/sampling
- Sound level detection and monitoring
- Line-level audio input to recording equipment
Package Contents
- 1× Adafruit SPW2430 Silicon MEMS Microphone Breakout
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- MEMS microphone
- A tiny microphone made using micro-electromechanical systems, the same style of miniature manufacturing used in many phone sensors. It lets the board detect sound without needing an external microphone, which is useful for noise-reactive projects and simple audio input.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
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